{"id":3781,"date":"2024-08-19T23:55:57","date_gmt":"2024-08-19T15:55:57","guid":{"rendered":"https:\/\/cathayvista.top\/?p=3781"},"modified":"2025-01-31T10:13:44","modified_gmt":"2025-01-31T02:13:44","slug":"duolingo-zhen","status":"publish","type":"post","link":"https:\/\/cathayvista.top\/index.php\/2024\/08\/19\/duolingo-zhen\/","title":{"rendered":"\u591a\u90bb\u56fd \/ Duolingo &#8211; \u4e2d\u82f1\u6587\u7ef4\u57fa\u767e\u79d1\u8bcd\u6761\u878d\u5408"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote has-small-font-size is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-small-font-size\">\u4e2d\u6587\u8bcd\u6761\u539f\u6587\u94fe\u63a5\uff08\u65e0\u6cd5\u4ece\u4e2d\u56fd\u5185\u5730\u8bbf\u95ee\uff09\uff1a<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B\" target=\"_blank\" rel=\"noreferrer noopener\">\u8bf7\u70b9\u51fb\u8fd9\u91cc\u8bbf\u95ee<\/a> <br>\u82f1\u6587\u8bcd\u6761\u539f\u6587\u94fe\u63a5\uff08\u65e0\u6cd5\u4ece\u4e2d\u56fd\u5185\u5730\u8bbf\u95ee\uff09\uff1a<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo\" target=\"_blank\" rel=\"noreferrer noopener\">\u8bf7\u70b9\u51fb\u8fd9\u91cc\u8bbf\u95ee<\/a> <br>\u672c\u6587\u57fa\u4e8e\u82f1\u6587\u8bcd\u6761\u7684\u7ebf\u7d22\uff0c\u5e76\u8865\u5145\u90e8\u5206\u6765\u81ea\u4e2d\u6587\u8bcd\u6761\u7684\u5185\u5bb9\uff08\u5728\u4e8c\u8005\u51b2\u7a81\u65f6\uff0c\u4ee5\u66f4\u665a\u66f4\u65b0\u8005\u4e3a\u51c6\uff09\u3002 <\/p>\n\n\n\n<p class=\"has-small-font-size\">\u8fbd\u89c2\u642c\u8fd0\u65f6\u8fdb\u884c\u4e86\u5fc5\u8981\u7684\u5408\u89c4\u5316\u5904\u7406\uff0c\u4ee5\u4f7f\u5176\u80fd\u591f\u5728\u4e2d\u56fd\u5185\u5730\u4e0a\u4f20\u3002\u90e8\u5206\u6587\u5b57\u91c7\u7528<strong>\u6c49\u8bed\u62fc\u97f3<\/strong>\u65b9\u5f0f\u4ee3\u66ff\uff0c\u97f3\u8282\u540e\u7684\u6570\u5b57\u8868\u793a\u6c49\u8bed\u62fc\u97f3\u89c4\u5219\u4e2d\u7684\u58f0\u8c03\u3002 <\/p>\n\n\n\n<p class=\"has-small-font-size\">\u5173\u4e8e\u8fbd\u89c2\u7684\u7ef4\u57fa\u767e\u79d1\u642c\u8fd0\u8ba1\u5212\uff0c\u53ca\u5176\u4ed6\u5df2\u642c\u8fd0\u7684\u8bcd\u6761\uff0c<a href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/cathayvista.top\/index.php\/wikipedia-intro\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u8bf7\u70b9\u51fb\u8fd9\u91cc\u4e86\u89e3\u66f4\u591a<\/a>\u3002\u7ef4\u57fa\u767e\u79d1\uff08Wikipedia\uff09\u662f\u7f8e\u56fd\u7ef4\u57fa\u5a92\u4f53\u57fa\u91d1\u4f1a\u7684\u4e92\u8054\u7f51\u767e\u79d1\u9879\u76ee\uff0c\u5176\u5185\u5bb9\u53ef\u80fd\u53d7\u5230\u7acb\u573a\u3001\u4fe1\u606f\u6765\u6e90\u7b49\u56e0\u7d20\u5f71\u54cd\uff0c\u8bf7\u5ba2\u89c2\u770b\u5f85\u3002\u6b63\u6587\u5185\u5bb9\u4e0d\u4ee3\u8868\u8bd1\u8005\u89c2\u70b9\u3002 <\/p>\n\n\n\n<p class=\"has-small-font-size\">\u8fbd\u89c2\u63d0\u4f9b\u7684\u7ffb\u8bd1\u4ec5\u4f9b\u53c2\u8003\u3002<strong>\u6587\u4e2d\u53ef\u80fd\u5305\u542b\u65e0\u6cd5\u4ece\u4e2d\u56fd\u5185\u5730\u8bbf\u95ee\u7684\u94fe\u63a5\u3002<\/strong> <\/p>\n<cite>\u8fbd\u89c2\u6240\u642c\u8fd0\u7684\u8bcd\u6761\u6587\u672c\u4e0e\u7ef4\u57fa\u767e\u79d1\u4e00\u9053\u540c\u6837\u9075\u5faaCC BY-SA 4.0\u534f\u8bae\uff08<a href=\"https:\/\/zhuanlan.zhihu.com\/p\/653887754?utm_psn=1730141199812366337\" target=\"_blank\" rel=\"noreferrer noopener\">\u8fbd\u89c2\u642c\u8fd0\u7684\u4e2d\u82f1\u6587\u5bf9\u7167\u7248\u672c<\/a>\uff09\uff0c\u5728\u7b26\u5408\u534f\u8bae\u8981\u6c42\u7684\u60c5\u51b5\u4e0b\u60a8\u53ef\u4ee5\u514d\u8d39\u4f7f\u7528\u5176\u5185\u5bb9\uff08\u5305\u62ec\u5546\u7528\uff09\u3002\u56fe\u7247\u548c\u89c6\u9891\u53ef\u80fd\u9075\u5faa\u4e0d\u540c\u7684\u5171\u4eab\u534f\u8bae\u3002<a href=\"https:\/\/zhuanlan.zhihu.com\/p\/666846485?utm_psn=1730141316690960386\" target=\"_blank\" rel=\"noreferrer noopener\">\u8bf7\u70b9\u51fb\u8fd9\u91cc\u8bbf\u95ee<\/a><\/cite><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u6b63\u6587\uff08\u53d1\u5e03\u4e8e\u77e5\u4e4e\u4e13\u680f\uff09<\/h2>\n\n\n\n<p><a href=\"https:\/\/zhuanlan.zhihu.com\/p\/715408605\/\" data-type=\"link\" data-id=\"https:\/\/zhuanlan.zhihu.com\/p\/715408605\/\">\u8bf7\u70b9\u51fb\u8fd9\u91cc\u8bbf\u95ee<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"See_also\">2. \u53c2\u89c1\uff08\u7ef4\u57fa\u767e\u79d1\u7684\u76f8\u5173\u8bcd\u6761\uff09| See also<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/zh.wikipedia.org\/wiki\/File:Globelang.svg\"><\/a><a href=\"https:\/\/zh.wikipedia.org\/wiki\/Portal:%E8%AF%AD%E8%A8%80\">\u8bed\u8a00\u4e3b\u9898<\/a><\/li>\n\n\n\n<li><img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"23\" srcset=\"\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/d\/d7\/Desktop_computer_clipart_-_Yellow_theme.svg\/48px-Desktop_computer_clipart_-_Yellow_theme.svg.png 1.5x, \/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/d\/d7\/Desktop_computer_clipart_-_Yellow_theme.svg\/64px-Desktop_computer_clipart_-_Yellow_theme.svg.png 2x\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/d\/d7\/Desktop_computer_clipart_-_Yellow_theme.svg\/32px-Desktop_computer_clipart_-_Yellow_theme.svg.png\" alt=\"\"><a href=\"https:\/\/zh.wikipedia.org\/wiki\/Portal:%E4%BF%A1%E6%81%AF%E6%8A%80%E6%9C%AF\">\u4fe1\u606f\u6280\u672f\u4e3b\u9898<\/a><\/li>\n<\/ul>\n\n\n\n<p>\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/p>\n\n\n\n<ul class=\"has-small-font-size wp-block-list\">\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Language_education\">Language education<\/a> \/ <a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E8%AF%AD%E8%A8%80%E6%95%99%E8%82%B2\">\u8bed\u8a00\u6559\u80b2<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Distance_education\">Distance education<\/a>\u3010\u8fdc\u7a0b\u6559\u80b2\u3011<\/li>\n\n\n\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Language_pedagogy\">Language pedagogy<\/a>\u3010\u8bed\u8a00\u6559\u5b66\u6cd5\u3011<\/li>\n\n\n\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Music_education\">Music education<\/a>\u3010\u97f3\u4e50\u6559\u80b2\u3011<\/li>\n\n\n\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Mathematics_education\">Mathematics education<\/a>\u3010\u6570\u5b66\u6559\u80b2\u3011<\/li>\n\n\n\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Language_assessment\">Language assessment<\/a>\u3010\u8bed\u8a00\u8bc4\u4f30\u3011<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"References\">3. \u82f1\u6587\u8bcd\u6761\u53c2\u8003\u6587\u732e | References<\/h2>\n\n\n\n<ol class=\"has-small-font-size wp-block-list\">\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-10K_2-0\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.sec.gov\/ix?doc=\/Archives\/edgar\/data\/1562088\/000156208824000050\/duol-20231231.htm\">&#8220;Duolingo, Inc. 2023 Annual Report (Form 10-K)&#8221;<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/U.S._Securities_and_Exchange_Commission\">U.S. Securities and Exchange Commission<\/a>. February 29, 2024. Retrieved\u00a0March 1,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-kotlin_3-0\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/migrating-duolingos-android-app-to-100-kotlin\">&#8220;Migrating Duolingo&#8217;s Android app to 100% Kotlin&#8221;<\/a>.\u00a0<em>blog.duolingo.com<\/em>. April 6, 2020.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20201223023826\/https:\/\/blog.duolingo.com\/migrating-duolingos-android-app-to-100-kotlin\/\">Archived<\/a>\u00a0from the original on December 23, 2020. Retrieved\u00a0September 17,\u00a02020.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-real_world_swift_4-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/making.duolingo.com\/real-world-swift\">&#8220;Real World Swift \u2013 Making Duolingo Blog&#8221;<\/a>.\u00a0<em>making.duolingo.com<\/em>. January 7, 2015.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190606014131\/https:\/\/making.duolingo.com\/real-world-swift\">Archived<\/a>\u00a0from the original on June 6, 2019. Retrieved\u00a0October 22,\u00a02018.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-making.duolingo.com_5-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/making.duolingo.com\/rewriting-duolingos-engine-in-scala\">&#8220;Rewriting Duolingo&#8217;s engine in Scala \u2013 Making Duolingo Blog&#8221;<\/a>.\u00a0<em>making.duolingo.com<\/em>. January 31, 2017.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190804123312\/https:\/\/making.duolingo.com\/rewriting-duolingos-engine-in-scala\">Archived<\/a>\u00a0from the original on August 4, 2019. Retrieved\u00a0February 1,\u00a02017.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-7\">^<\/a><\/strong>\u00a0Ortiz, Sabrina.\u00a0<a href=\"https:\/\/www.zdnet.com\/article\/duolingo-opens-waitlist-for-its-new-free-music-course-heres-how-to-sign-up\/\">&#8220;Duolingo opens waitlist for its new, free music course. Here&#8217;s how to sign up&#8221;<\/a>.\u00a0<em>ZDNET<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231012040140\/https:\/\/www.zdnet.com\/article\/duolingo-opens-waitlist-for-its-new-free-music-course-heres-how-to-sign-up\/\">Archived<\/a>\u00a0from the original on October 12, 2023. Retrieved\u00a0October 11,\u00a02023.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-math_8-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-math_8-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Duolingo Team (October 26, 2022).\u00a0<a href=\"https:\/\/blog.duolingo.com\/duolingo-launches-math-app\/\">&#8220;Duolingo Math makes learning easy as pi(e)&#8221;<\/a>.\u00a0<em>Duolingo<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20221027114012\/https:\/\/blog.duolingo.com\/duolingo-launches-math-app\/\">Archived<\/a>\u00a0from the original on October 27, 2022. Retrieved\u00a0October 27,\u00a02022.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:3_9-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:3_9-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Matt (February 20, 2023).\u00a0<a href=\"https:\/\/duoplanet.com\/duolingo-languages-list\/\">&#8220;The Complete List Of EVERY Duolingo Language&#8221;<\/a>.\u00a0<em>Duoplanet<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220921163404\/https:\/\/duoplanet.com\/duolingo-languages-list\/\">Archived<\/a>\u00a0from the original on September 21, 2022. Retrieved\u00a0September 21,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-10\">^<\/a><\/strong>\u00a0Higgins-Dunn, Noah (April 14, 2019).\u00a0<a href=\"https:\/\/www.cnbc.com\/2019\/04\/14\/game-of-thrones-fans-this-app-teaches-you-to-speak-in-high-valyrian.html\">&#8220;If you are a &#8216;Game of Thrones&#8217; fan, this app will teach you how to speak in High Valyrian&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/CNBC\">CNBC<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191112051445\/https:\/\/www.cnbc.com\/2019\/04\/14\/game-of-thrones-fans-this-app-teaches-you-to-speak-in-high-valyrian.html\">Archived<\/a>\u00a0from the original on November 12, 2019. Retrieved\u00a0May 23,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-11\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/spaced-repetition-for-learning\/\">&#8220;Dear Duolingo: Why is spaced repetition so important for learning?&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. December 26, 2023. Retrieved\u00a0August 2,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-12\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/investors.duolingo.com\/news-releases\/news-release-details\/duolingo-reports-45-revenue-growth-and-record-profitability\">&#8220;duolingo reports 45% revenue growth and record profitability in first quarter 2024; raises full year guidance&#8221;<\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-13\">^<\/a><\/strong>\u00a0Ceci, Laura.\u00a0<a href=\"https:\/\/www.statista.com\/statistics\/1239522\/top-language-learning-apps-downloads\/\">&#8220;Top language learning apps by downloads 2023&#8221;<\/a>.\u00a0<em>Statista<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240120095059\/https:\/\/www.statista.com\/statistics\/1239522\/top-language-learning-apps-downloads\/\">Archived<\/a>\u00a0from the original on January 20, 2024. Retrieved\u00a0October 6,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-14\">^<\/a><\/strong>\u00a0Transcribing, Motley Fool (August 7, 2024).\u00a0<a href=\"https:\/\/www.fool.com\/earnings\/call-transcripts\/2024\/08\/07\/duolingo-duol-q2-2024-earnings-call-transcript\/\">&#8220;Duolingo (DUOL) Q2 2024 Earnings Call Transcript&#8221;<\/a>.\u00a0<em>The Motley Fool<\/em>. Retrieved\u00a0August 9,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-15\">^<\/a><\/strong>\u00a0Shortt, Mitchell; Tilak, Shantanu; Kuznetcova, Irina; Martens, Bethany; Akinkuolie, Babatunde (March 4, 2023).\u00a0<a href=\"https:\/\/doi.org\/10.1080%2F09588221.2021.1933540\">&#8220;Gamification in mobile-assisted language learning: a systematic review of Duolingo literature from public release of 2012 to early 2020&#8221;<\/a>.\u00a0<em>Computer Assisted Language Learning<\/em>.\u00a0<strong>36<\/strong>\u00a0(3): 517\u2013554.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Doi_(identifier)\">doi<\/a>:<a href=\"https:\/\/doi.org\/10.1080%2F09588221.2021.1933540\">10.1080\/09588221.2021.1933540<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/ISSN_(identifier)\">ISSN<\/a>\u00a0<a href=\"https:\/\/search.worldcat.org\/issn\/0958-8221\">0958-8221<\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-16\">^<\/a><\/strong>\u00a0Cohen, Ben (June 14, 2024).\u00a0<a href=\"https:\/\/www.wsj.com\/tech\/personal-tech\/duolingo-streaks-notifications-app-spanish-bc87d6e4?mod=tech_lead_story\">&#8220;The Only App That Always Wins the Battle for Your Attention&#8221;<\/a>.\u00a0<em>The Wall Street Journal<\/em>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-17\">^<\/a><\/strong>\u00a0Morley, Olivia (April 5, 2024).\u00a0<a href=\"https:\/\/www.adweek.com\/social-marketing\/social-media-week-preview-duolingos-masterminded-social-listening-tactics\/\">&#8220;Duolingo&#8217;s Masterminded Social Listening Tactics&#8221;<\/a>.\u00a0<em>www.adweek.com<\/em>. Retrieved\u00a0June 18,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-TechCrunch_Article_18-0\">^<\/a><\/strong>\u00a0Siegler, M.G. (April 12, 2011).\u00a0<a href=\"https:\/\/techcrunch.com\/2011\/04\/12\/duolingo\/\">&#8220;Meet Duolingo, Google&#8217;s Next Acquisition Target; Learn A Language, Help The Web&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20201129162336\/https:\/\/techcrunch.com\/2011\/04\/12\/duolingo\/\">Archived<\/a>\u00a0from the original on November 29, 2020. Retrieved\u00a0November 21,\u00a02014.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-vator.tv_19-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-vator.tv_19-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Loeb, Steven (June 22, 2018).\u00a0<a href=\"https:\/\/vator.tv\/news\/2018-06-22-when-duolingo-was-young-the-early-years\">&#8220;When Duolingo was young: the early years&#8221;<\/a>.\u00a0<em>VatorNews<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20180625024407\/https:\/\/vator.tv\/news\/2018-06-22-when-duolingo-was-young-the-early-years\">Archived<\/a>\u00a0from the original on June 25, 2018. Retrieved\u00a0December 21,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-20\">^<\/a><\/strong>\u00a0Ahn, Luis von.\u00a0<a href=\"https:\/\/www.quora.com\/What-made-Luis-Von-Ahn-start-Duolingo\/answer\/Luis-Von-Ahn\">&#8220;Luis Von Ahn&#8217;s answer to What made Luis Von Ahn start Duolingo?&#8221;<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240222194940\/https:\/\/www.quora.com\/What-made-Luis-Von-Ahn-start-Duolingo\/answer\/Luis-Von-Ahn\">Archived<\/a>\u00a0from the original on February 22, 2024. Retrieved\u00a0May 14,\u00a02021\u00a0\u2013 via Quora.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-Businessweek_2022_21-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-Businessweek_2022_21-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Gifford, Bill (December 2, 2022).\u00a0<a href=\"https:\/\/www.bloomberg.com\/news\/features\/2022-12-02\/duolingo-plus-gave-fans-of-free-app-a-cost-worth-paying\">&#8220;Can Duolingo Actually Teach You Spanish?&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Bloomberg_Businessweek\">Bloomberg Businessweek<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20221202175759\/https:\/\/www.bloomberg.com\/news\/features\/2022-12-02\/duolingo-plus-gave-fans-of-free-app-a-cost-worth-paying\">Archived<\/a>\u00a0from the original on December 2, 2022. Retrieved\u00a0December 2,\u00a02022.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-lifestyle.livemint.com_22-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-lifestyle.livemint.com_22-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Janardhan, Arun (May 27, 2022).\u00a0<a href=\"https:\/\/lifestyle.livemint.com\/\/news\/big-story\/duolingos-luis-von-ahn-believes-in-the-power-of-language-111653590512842.html\">&#8220;Duolingo&#8217;s Luis von Ahn believes in the power of language&#8221;<\/a>.\u00a0<em>Mintlounge<\/em>. Illustration by Priya Kuriyan. The beginning.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220527040040\/https:\/\/lifestyle.livemint.com\/\/news\/big-story\/duolingos-luis-von-ahn-believes-in-the-power-of-language-111653590512842.html\">Archived<\/a>\u00a0from the original on May 27, 2022. Retrieved\u00a0May 28,\u00a02022.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:0_23-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:0_23-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Olson, Parmy.\u00a0<a href=\"https:\/\/www.forbes.com\/sites\/parmyolson\/2014\/01\/22\/crowdsourcing-capitalists-how-duolingos-founders-offered-free-education-to-millions\/\">&#8220;Crowdsourcing Capitalists: How Duolingo&#8217;s Founders Offered Free Education To Millions&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Forbes\">Forbes<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20140127012240\/https:\/\/www.forbes.com\/sites\/parmyolson\/2014\/01\/22\/crowdsourcing-capitalists-how-duolingos-founders-offered-free-education-to-millions\/\">Archived<\/a>\u00a0from the original on January 27, 2014. Retrieved\u00a0August 26,\u00a02017.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-24\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.nbcnews.com\/now\/video\/duolingo-creator-to-be-inducted-into-inventors-hall-of-fame-196504645525\">&#8220;Duolingo creator to be inducted into Inventors Hall of Fame&#8221;<\/a>\u00a0(Video).\u00a0<em>NBC News<\/em>. October 27, 2023.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231102231928\/https:\/\/www.nbcnews.com\/now\/video\/duolingo-creator-to-be-inducted-into-inventors-hall-of-fame-196504645525\">Archived<\/a>\u00a0from the original on November 2, 2023. Retrieved\u00a0November 2,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-25\">^<\/a><\/strong>\u00a0Lee, Dami (December 13, 2018).\u00a0<a href=\"https:\/\/www.theverge.com\/2018\/12\/13\/18137843\/duolingo-owl-redesign-language-learning-app\">&#8220;Duolingo redesigned its owl to guilt-trip you even harder&#8221;<\/a>.\u00a0<em>The Verge<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240329050328\/https:\/\/www.theverge.com\/2018\/12\/13\/18137843\/duolingo-owl-redesign-language-learning-app\">Archived<\/a>\u00a0from the original on March 29, 2024. Retrieved\u00a0June 6,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-NSFGrant_26-0\">^<\/a><\/strong>\u00a0Ahn, Luis von (2017).\u00a0<a href=\"https:\/\/www.nsf.gov\/awardsearch\/showAward.do?AwardNumber=1054630\">&#8220;Online Education as a Vehicle for Human Computation&#8221;<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/U.S._National_Science_Foundation\">U.S. National Science Foundation<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20160304110021\/https:\/\/www.nsf.gov\/awardsearch\/showAward.do?AwardNumber=1054630\">Archived<\/a>\u00a0from the original on March 4, 2016. Retrieved\u00a0April 6,\u00a02018.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-27\">^<\/a><\/strong>\u00a0Masson-Forsythe, Heather (December 22, 2022).\u00a0<a href=\"https:\/\/beta.nsf.gov\/science-matters\/nsf-gave-duolingo-its-wings\">&#8220;NSF gave Duolingo its wings!&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/U.S._National_Science_Foundation\">U.S. National Science Foundation<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230325173930\/https:\/\/beta.nsf.gov\/science-matters\/nsf-gave-duolingo-its-wings\">Archived<\/a>\u00a0from the original on March 25, 2023. Retrieved\u00a0March 25,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-NewScientist_28-0\">^<\/a><\/strong>\u00a0Giles, Jim (January 11, 2012).\u00a0<a href=\"https:\/\/www.newscientist.com\/article\/mg21328476.200-learn-a-language-translate-the-web.html\">&#8220;Learn a language, translate the web&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/New_Scientist\">New Scientist<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20150428034914\/http:\/\/www.newscientist.com\/article\/mg21328476.200-learn-a-language-translate-the-web.html\">Archived<\/a>\u00a0from the original on April 28, 2015. Retrieved\u00a0August 26,\u00a02017.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:1_29-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:1_29-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Lardinois, Frederic (June 10, 2015).\u00a0<a href=\"https:\/\/techcrunch.com\/2015\/06\/10\/duolingo-raises-45-million-series-d-round-led-by-google-ventures-now-valued-at-470m\/\">&#8220;Duolingo Raises $45 Million Series D Round Led By Google Capital, Now Valued At $470M&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20150804225710\/http:\/\/techcrunch.com\/2015\/06\/10\/duolingo-raises-45-million-series-d-round-led-by-google-ventures-now-valued-at-470m\/\">Archived<\/a>\u00a0from the original on August 4, 2015. Retrieved\u00a0December 14,\u00a02019.\u00a0<q>Instead, the company is now using its Test Center certification program as a revenue source (the tests cost $20) and says that it has other plans to monetize.<\/q><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-30\">^<\/a><\/strong>\u00a0Ahn, Luis von (May 12, 2022).\u00a0<a href=\"https:\/\/investors.duolingo.com\/static-files\/d667f9d1-8f7f-418c-b116-e699a30a9826\">&#8220;Duol shareholder letter 2022&#8221;<\/a>\u00a0(DOC). (anonymous).\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220512201622\/https:\/\/investors.duolingo.com\/static-files\/d667f9d1-8f7f-418c-b116-e699a30a9826\">Archived<\/a>\u00a0from the original on May 12, 2022. Retrieved\u00a0May 28,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-wsj_31-0\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blogs.wsj.com\/venturecapital\/2012\/06\/19\/the-daily-start-up-kutcher-backed-language-site-duolingo-finds-its-voice\/\">&#8220;The Daily Start-Up: Kutcher-Backed Language Site Duolingo Finds Its Voice&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/The_Wall_Street_Journal\">The Wall Street Journal<\/a><\/em>. June 19, 2012.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190403191839\/https:\/\/blogs.wsj.com\/venturecapital\/2012\/06\/19\/the-daily-start-up-kutcher-backed-language-site-duolingo-finds-its-voice\/\">Archived<\/a>\u00a0from the original on April 3, 2019. Retrieved\u00a0July 13,\u00a02012.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-32\">^<\/a><\/strong>\u00a0Robertson, Adi (December 16, 2011).\u00a0<a href=\"https:\/\/www.theverge.com\/2011\/12\/16\/2639262\/duolingo-translate-internet-teach-languages\">&#8220;Duolingo will translate the internet while teaching languages&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/The_Verge\">The Verge<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20120108020114\/https:\/\/www.theverge.com\/2011\/12\/16\/2639262\/duolingo-translate-internet-teach-languages\">Archived<\/a>\u00a0from the original on January 8, 2012. Retrieved\u00a0February 3,\u00a02016.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-33\">^<\/a><\/strong>\u00a0Loeb, Steven (June 22, 2018).\u00a0<a href=\"https:\/\/vator.tv\/news\/2018-06-22-when-duolingo-was-young-the-early-years\">&#8220;When Duolingo was young: the early years&#8221;<\/a>.\u00a0<em>VatorNews<\/em>. Duolingo&#8217;s Third Year.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20180625024407\/https:\/\/vator.tv\/news\/2018-06-22-when-duolingo-was-young-the-early-years\">Archived<\/a>\u00a0from the original on June 25, 2018. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-34\">^<\/a><\/strong>\u00a0Spice, Byron.\u00a0<a href=\"http:\/\/www.cmu.edu\/news\/stories\/archives\/2012\/june\/june19_duolingo.html\">&#8220;Press Release: Duolingo.com Users Will Translate Web As They Learn a New Language&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Carnegie_Mellon_University\">Carnegie Mellon University<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20120826233724\/http:\/\/www.cmu.edu\/news\/stories\/archives\/2012\/june\/june19_duolingo.html\">Archived<\/a>\u00a0from the original on August 26, 2012. Retrieved\u00a0May 14,\u00a02021.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-35\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/techcrunch.com\/2012\/09\/17\/duolingo-raises-15m-series-b-round-lead-by-nea-will-expand-to-more-languages-and-to-mobile-soon\/\">&#8220;Duolingo Raises $15M Series B Round Led By NEA, Will Expand To More Languages And To Mobile Soon&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>. September 17, 2012.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191214003206\/http:\/\/social.techcrunch.com\/2012\/09\/17\/duolingo-raises-15m-series-b-round-lead-by-nea-will-expand-to-more-languages-and-to-mobile-soon\/\">Archived<\/a>\u00a0from the original on December 14, 2019. Retrieved\u00a0December 13,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-TCiOS_36-0\">^<\/a><\/strong>\u00a0Lardinois, Frederic (November 13, 2012).\u00a0<a href=\"https:\/\/techcrunch.com\/2012\/11\/13\/language-learning-service-duolingo-launches-its-first-iphone-app\/\">&#8220;Language Learning Service Duolingo Launches Its First iPhone App&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/AOL\">AOL<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20121113205450\/https:\/\/techcrunch.com\/2012\/11\/13\/language-learning-service-duolingo-launches-its-first-iphone-app\/\">Archived<\/a>\u00a0from the original on November 13, 2012. Retrieved\u00a0April 18,\u00a02016.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-37\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/techcrunch.com\/2013\/05\/29\/free-language-learning-service-duolingo-comes-to-android-expects-this-will-double-its-user-base-to-over-6m\/\">&#8220;Free Language Learning Service Duolingo Comes To Android&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>. May 29, 2013.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20210514230149\/https:\/\/social.techcrunch.com\/2013\/05\/29\/free-language-learning-service-duolingo-comes-to-android-expects-this-will-double-its-user-base-to-over-6m\/\">Archived<\/a>\u00a0from the original on May 14, 2021. Retrieved\u00a0May 14,\u00a02021.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-38\">^<\/a><\/strong>\u00a0Farber, Dan (July 11, 2013).\u00a0<a href=\"http:\/\/news.cnet.com\/8301-1023_3-57593078-93\/duolingo-brings-free-language-courses-to-the-ipad\/\">&#8220;Duolingo brings free language courses to the iPad&#8221;<\/a>. C net.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20130820163502\/http:\/\/news.cnet.com\/8301-1023_3-57593078-93\/duolingo-brings-free-language-courses-to-the-ipad\/\">Archived<\/a>\u00a0from the original on August 20, 2013. Retrieved\u00a0February 21,\u00a02014.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-TechCrunch1_39-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-TechCrunch1_39-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/techcrunch.com\/2014\/02\/18\/duolingo-raises-20m-series-c-round-led-by-kleiner-perkins-wants-to-dominate-online-language-learning\/\">&#8220;Duolingo Raises $20M Series C Led By Kleiner Perkins To Dominate Online Language Learning&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>. February 14, 2014.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20150310011231\/https:\/\/social.techcrunch.com\/2014\/02\/18\/duolingo-raises-20m-series-c-round-led-by-kleiner-perkins-wants-to-dominate-online-language-learning\/\">Archived<\/a>\u00a0from the original on March 10, 2015. Retrieved\u00a0May 14,\u00a02021.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:2_40-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:2_40-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/venturebeat.com\/2015\/06\/10\/100m-users-strong-duolingo-raises-45m-led-by-google-at-a-470m-valuation-to-grow-language-learning-platform\/\">&#8220;100M users strong, Duolingo raises $45M led by Google at a $470M valuation to grow language-learning platform&#8221;<\/a>.\u00a0<em>VentureBeat<\/em>. June 10, 2015.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20150616221249\/https:\/\/venturebeat.com\/2015\/06\/10\/100m-users-strong-duolingo-raises-45m-led-by-google-at-a-470m-valuation-to-grow-language-learning-platform\/\">Archived<\/a>\u00a0from the original on June 16, 2015. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-41\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/aws.amazon.com\/solutions\/case-studies\/duolingo-case-study-dynamodb\/\">&#8220;Duolingo Case Study \u2013 DynamoDB&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Amazon_Web_Services\">Amazon Web Services<\/a>, Inc<\/em>. 2016.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20160628175804\/https:\/\/aws.amazon.com\/solutions\/case-studies\/duolingo-case-study-dynamodb\/\">Archived<\/a>\u00a0from the original on June 28, 2016. Retrieved\u00a0December 23,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-42\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=fhnAvn2YxZA\"><em>Duolingo Stores 31 Billion Items on Amazon DynamoDB and Uses AWS to Deliver Language Lessons<\/em><\/a>, April 25, 2016,\u00a0<a href=\"https:\/\/web.archive.org\/web\/20201028161357\/https:\/\/www.youtube.com\/watch?v=fhnAvn2YxZA&amp;feature=applinks\">archived<\/a>\u00a0from the original on October 28, 2020, retrieved\u00a0December 23,\u00a02019\u00a0\u2013 via\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/YouTube\">YouTube<\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-43\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/techcrunch.com\/2017\/07\/25\/duolingo-raises-25m-at-a-700m-valuation\/\">&#8220;Duolingo raises $25M at a $700M valuation&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>. July 25, 2017.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190421184428\/http:\/\/social.techcrunch.com\/2017\/07\/25\/duolingo-raises-25m-at-a-700m-valuation\/\">Archived<\/a>\u00a0from the original on April 21, 2019. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-Duolingo_44-0\">^<\/a><\/strong>\u00a0Duolingo.\u00a0<a href=\"https:\/\/www.prnewswire.com\/news-releases\/duolingo-now-valued-at-1-5-billion-300968516.html\">&#8220;Duolingo Now Valued at $1.5 Billion&#8221;<\/a>.\u00a0<em>www.prnewswire.com<\/em>\u00a0(Press release).\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191212102948\/https:\/\/www.prnewswire.com\/news-releases\/duolingo-now-valued-at-1-5-billion-300968516.html\">Archived<\/a>\u00a0from the original on December 12, 2019. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-forbes.com_45-0\">^<\/a><\/strong>\u00a0Elaine, Ramirez.\u00a0<a href=\"https:\/\/www.forbes.com\/sites\/elaineramirez\/2017\/09\/07\/duolingo-korean-language-course-launch\/4\/#2ecaa1d8739f\">&#8220;Duolingo Is Launching A Korean Course To Cash In On Asia&#8217;s Booming Language Market&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Forbes\">Forbes<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20181221041331\/https:\/\/www.forbes.com\/sites\/elaineramirez\/2017\/09\/07\/duolingo-korean-language-course-launch\/4\/#2ecaa1d8739f\">Archived<\/a>\u00a0from the original on December 21, 2018. Retrieved\u00a0October 11,\u00a02017.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-social.techcrunch.com_46-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-social.techcrunch.com_46-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Lardinois, Frederic (August 2018).\u00a0<a href=\"https:\/\/techcrunch.com\/2018\/08\/01\/duolingo-hires-its-first-chief-marketing-officer-as-active-user-numbers-stagnate\/\">&#8220;Duolingo hires its first chief marketing officer as active user numbers stagnate but revenue grows&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190504102838\/http:\/\/social.techcrunch.com\/2018\/08\/01\/duolingo-hires-its-first-chief-marketing-officer-as-active-user-numbers-stagnate\/\">Archived<\/a>\u00a0from the original on May 4, 2019. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-47\">^<\/a><\/strong>\u00a0Sawers, Paul (December 4, 2019).\u00a0<a href=\"https:\/\/venturebeat.com\/2019\/12\/04\/duolingo-raises-30-million-from-alphabets-capitalg-at-1-5-billion-valuation\/\">&#8220;Duolingo raises $30 million from Alphabet&#8217;s CapitalG at $1.5 billion valuation&#8221;<\/a>.\u00a0<em>VentureBeat<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191204183413\/https:\/\/venturebeat.com\/2019\/12\/04\/duolingo-raises-30-million-from-alphabets-capitalg-at-1-5-billion-valuation\/\">Archived<\/a>\u00a0from the original on December 4, 2019. Retrieved\u00a0December 13,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-triblive.com_48-0\">^<\/a><\/strong>\u00a0Lindstrom, Natasha (December 4, 2019).\u00a0<a href=\"https:\/\/triblive.com\/local\/pittsburgh-allegheny\/duolingo-touts-1-5b-valuation-language-company-to-hire-100-more-people-mostly-in-pittsburgh\/\">&#8220;Duolingo touts $1.5B valuation; language company to hire 100 more people, mostly in Pittsburgh&#8221;<\/a>.\u00a0<em>triblive.com<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191205133922\/https:\/\/triblive.com\/local\/pittsburgh-allegheny\/duolingo-touts-1-5b-valuation-language-company-to-hire-100-more-people-mostly-in-pittsburgh\/\">Archived<\/a>\u00a0from the original on December 5, 2019. Retrieved\u00a0December 15,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-49\">^<\/a><\/strong>\u00a0Munoz, Juan Andres (October 15, 2013).\u00a0<a href=\"https:\/\/www.cnn.com\/2013\/10\/15\/tech\/mobile\/duolingo-incubator-language-teaching\/index.html\">&#8220;Duolingo &#8216;incubator&#8217; aims to crowdsource language teaching&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/CNN\">CNN<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220418212112\/https:\/\/www.cnn.com\/2013\/10\/15\/tech\/mobile\/duolingo-incubator-language-teaching\/index.html\">Archived<\/a>\u00a0from the original on April 18, 2022. Retrieved\u00a0April 18,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-50\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/ending-honoring-our-volunteer-contributor-program-2\/\">&#8220;Ending &amp; honoring our volunteer Contributor program&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. March 10, 2021.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20210310142059\/https:\/\/blog.duolingo.com\/ending-honoring-our-volunteer-contributor-program-2\/\">Archived<\/a>\u00a0from the original on March 10, 2021. Retrieved\u00a0April 7,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-51\">^<\/a><\/strong>\u00a0Sumagaysay, Levi.\u00a0<a href=\"https:\/\/www.marketwatch.com\/story\/duolingo-the-fast-growing-language-learning-app-files-for-ipo-11624921568\">&#8220;Duolingo, the fast-growing language-learning app, files for IPO&#8221;<\/a>\u00a0(IPO Report).\u00a0<em>MarketWatch<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20210628232435\/https:\/\/www.marketwatch.com\/story\/duolingo-the-fast-growing-language-learning-app-files-for-ipo-11624921568\">Archived<\/a>\u00a0from the original on June 28, 2021. Retrieved\u00a0July 5,\u00a02021.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-52\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220610220221\/https:\/\/techcrunch.com\/2022\/06\/09\/duolingo-back-in-china\/\">&#8220;Duolingo back in China app stores after 1 year&#8221;<\/a>.\u00a0<em>TechCrunch<\/em>. June 10, 2022. Archived from\u00a0<a href=\"https:\/\/techcrunch.com\/2022\/06\/09\/duolingo-back-in-china\/\">the original<\/a>\u00a0on June 10, 2022. Retrieved\u00a0July 26,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-53\">^<\/a><\/strong>\u00a0Whateley, Dan; Mangalindan, J.P. (April 6, 2022).\u00a0<a href=\"https:\/\/www.businessinsider.com\/29-tiktok-marketers-helping-brands-like-netflix-duolingo-and-ryanair-2022-3\">&#8220;Meet the TikTok whisperers helping 10 top brands stand out on the app \u2014 from Netflix to Duolingo&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Business_Insider\">Business Insider<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220816164916\/https:\/\/www.businessinsider.com\/29-tiktok-marketers-helping-brands-like-netflix-duolingo-and-ryanair-2022-3\">Archived<\/a>\u00a0from the original on August 16, 2022. Retrieved\u00a0August 16,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-54\">^<\/a><\/strong>\u00a0Haasch, Palmer (November 18, 2021).\u00a0<a href=\"https:\/\/www.insider.com\/duolingo-tiktok-language-learning-memes-duo-owl-2021-11\">&#8220;Duolingo&#8217;s mascot went viral on TikTok by twerking on tables and thirsting after Dua Lipa&#8221;<\/a>.\u00a0<em>Insider<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240222195119\/https:\/\/www.businessinsider.com\/duolingo-tiktok-language-learning-memes-duo-owl-2021-11\">Archived<\/a>\u00a0from the original on February 22, 2024. Retrieved\u00a0August 16,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-2022_redesign_55-0\">^<\/a><\/strong>\u00a0Goggin, Ben (August 26, 2022).\u00a0<a href=\"https:\/\/www.nbcnews.com\/tech\/tech-news\/duolingos-update-redesign-luis-von-ahn-interview-rcna44655\">&#8220;Duolingo&#8217;s redesign has some fans up in arms. Its CEO says it&#8217;s not turning back&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/NBC_News\">NBC News<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220826235521\/https:\/\/www.nbcnews.com\/tech\/tech-news\/duolingos-update-redesign-luis-von-ahn-interview-rcna44655\">Archived<\/a>\u00a0from the original on August 26, 2022. Retrieved\u00a0August 26,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-56\">^<\/a><\/strong>\u00a0Lang, Jamie (October 5, 2022).\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230323013228\/https:\/\/www.cartoonbrew.com\/studios\/duolingo-acquires-gunner-animation-studio-221889.html\">&#8220;Duolingo Acquires Detroit-Based Design And Animation Studio Gunner&#8221;<\/a>.\u00a0<em>Cartoon Brew<\/em>. Archived from\u00a0<a href=\"https:\/\/www.cartoonbrew.com\/studios\/duolingo-acquires-gunner-animation-studio-221889.html\">the original<\/a>\u00a0on March 23, 2023. Retrieved\u00a0July 16,\u00a02023.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:4_57-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:4_57-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/blog.duolingo.com\/new-subjects\/\">&#8220;One app to school them all: the expanded Duolingo \ud83c\udfb6 \u2797 \ud83c\uddf2\ud83c\uddfd&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. October 11, 2023.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231011165653\/https:\/\/blog.duolingo.com\/new-subjects\/\">Archived<\/a>\u00a0from the original on October 11, 2023. Retrieved\u00a0October 11,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-58\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/duolingo-max\/\">&#8220;Introducing Duolingo Max, a learning experience powered by GPT-4&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. March 14, 2023. Retrieved\u00a0April 24,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-59\">^<\/a><\/strong>\u00a0Korn, Jennifer (January 9, 2024). Thorbecke, Catherine (ed.).\u00a0<a href=\"https:\/\/edition.cnn.com\/2024\/01\/09\/tech\/duolingo-layoffs-due-to-ai\/index.html\">&#8220;Duolingo lays off staff as language learning app shifts toward AI&#8221;<\/a>.\u00a0<em>CNN<\/em>. Contributed by Catherine Thorbecke.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240111082828\/https:\/\/edition.cnn.com\/2024\/01\/09\/tech\/duolingo-layoffs-due-to-ai\/index.html\">Archived<\/a>\u00a0from the original on January 11, 2024. Retrieved\u00a0January 11,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-60\">^<\/a><\/strong>\u00a0Nolan, Beatrice (January 10, 2024).\u00a0<a href=\"https:\/\/www.businessinsider.com\/duolingo-lays-off-workers-ai-tools-2024-1\">&#8220;Duolingo lays off workers as it leans on AI tools to carry out more tasks&#8221;<\/a>.\u00a0<em>Business Insider<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240111020531\/https:\/\/www.businessinsider.com\/duolingo-lays-off-workers-ai-tools-2024-1\">Archived<\/a>\u00a0from the original on January 11, 2024. Retrieved\u00a0January 11,\u00a02024.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:5_61-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:5_61-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Mansur, Osman; Shuttleworth, Jackson (August 29, 2023).\u00a0<a href=\"https:\/\/blog.duolingo.com\/widget-feature\/\">&#8220;How we developed our addictive and delightful widget&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. Retrieved\u00a0April 24,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-62\">^<\/a><\/strong>\u00a0Perez, Sarah (July 9, 2024).\u00a0<a href=\"https:\/\/techcrunch.com\/2024\/07\/09\/duolingo-acquires-detroit-based-design-studio-hobbes\/\">&#8220;Duolingo acquires Detroit-based design studio Hobbes&#8221;<\/a>.\u00a0<em>TechCrunch<\/em>. Retrieved\u00a0July 14,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-63\">^<\/a><\/strong>\u00a0Duolingo (October 11, 2023).\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=OVTSGL4BdDU\"><em>Introducing The Duolingo Method &#8211; How does Duolingo teach new subjects?<\/em><\/a>. Retrieved\u00a0August 2,\u00a02024\u00a0\u2013 via YouTube.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-64\">^<\/a><\/strong>\u00a0Brockbank, Dayna (October 5, 2020).\u00a0<a href=\"https:\/\/happilyevertravels.com\/duolingo-stories\/\">&#8220;Everything You Need to Know About Duolingo Stories \u2022 Happily Ever Travels&#8221;<\/a>.\u00a0<em>Happily Ever Travels<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20211007091457\/https:\/\/happilyevertravels.com\/duolingo-stories\/\">Archived<\/a>\u00a0from the original on October 7, 2021. Retrieved\u00a0August 26,\u00a02021.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-65\">^<\/a><\/strong>\u00a0Pajak, Bozena; Tsai, Karin (December 11, 2019).\u00a0<a href=\"https:\/\/blog.duolingo.com\/how-weve-improved-the-duolingo-learning-experience-this-year-and-a-sneak-peek-toward-2020\/\">&#8220;How we&#8217;ve improved the Duolingo learning experience this year (and a sneak peek toward 2020!)&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20210730021026\/https:\/\/blog.duolingo.com\/how-weve-improved-the-duolingo-learning-experience-this-year-and-a-sneak-peek-toward-2020\/\">Archived<\/a>\u00a0from the original on July 30, 2021. Retrieved\u00a0August 26,\u00a02021.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-66\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.tesl-ej.org\/pdf\/ej73\/m1.pdf\">&#8220;Duolingo&#8221;<\/a>\u00a0(PDF).\u00a0<em>TESL-EJ<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220122002600\/http:\/\/www.tesl-ej.org\/pdf\/ej73\/m1.pdf\">Archived<\/a>\u00a0(PDF)\u00a0from the original on January 22, 2022. Retrieved\u00a0December 31,\u00a02021.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-67\">^<\/a><\/strong>\u00a0Fians, Guilherme (2021).\u00a0<a href=\"https:\/\/link.springer.com\/book\/10.1007\/978-3-030-84230-7\"><em>Esperanto Revolutionaries and Geeks: Language Politics, Digital Media and the Making of an International Community<\/em><\/a>. London and New York:\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Palgrave_Macmillan\">Palgrave Macmillan<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Doi_(identifier)\">doi<\/a>:<a href=\"https:\/\/doi.org\/10.1007%2F978-3-030-84230-7\">10.1007\/978-3-030-84230-7<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/ISBN_(identifier)\">ISBN<\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Special:BookSources\/978-3-030-84229-1\"><bdi>978-3-030-84229-1<\/bdi><\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/S2CID_(identifier)\">S2CID<\/a>\u00a0<a href=\"https:\/\/api.semanticscholar.org\/CorpusID:245721938\">245721938<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20221031094243\/https:\/\/link.springer.com\/book\/10.1007\/978-3-030-84230-7\">Archived<\/a>\u00a0from the original on October 31, 2022. Retrieved\u00a0December 2,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-68\">^<\/a><\/strong>\u00a0Huynh, Duy; Zuo, Long; Iida, Hiroyuki (2016). &#8220;Analyzing Gamification of &#8220;Duolingo&#8221; with Focus on its Course Structure&#8221;.\u00a0<em>Games and Learning Alliance<\/em>. Lecture Notes in Computer Science. Vol.\u00a010056. Springer, Cham. pp.\u00a0268\u2013277.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Doi_(identifier)\">doi<\/a>:<a href=\"https:\/\/doi.org\/10.1007%2F978-3-319-50182-6_24\">10.1007\/978-3-319-50182-6_24<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/ISBN_(identifier)\">ISBN<\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Special:BookSources\/978-3319501819\"><bdi>978-3319501819<\/bdi><\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-71\">^<\/a><\/strong>\u00a0Yancey, Kevin P.; Settles, Burr (August 20, 2020).\u00a0<a href=\"https:\/\/research.duolingo.com\/papers\/yancey.kdd20.pdf?ref=blog.duolingo.com\">&#8220;A Sleeping, Recovering Bandit Algorithm for Optimizing Recurring Notifications&#8221;<\/a>\u00a0(PDF).\u00a0<em>Proceedings of the 26th ACM SIGKDD International Conference on Knowledge Discovery &amp; Data Mining<\/em>. California, United States: Association for Computing Machinery. pp.\u00a03008\u20133016.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Doi_(identifier)\">doi<\/a>:<a href=\"https:\/\/doi.org\/10.1145%2F3394486.3403351\">10.1145\/3394486.3403351<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/ISBN_(identifier)\">ISBN<\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Special:BookSources\/978-1-4503-7998-4\"><bdi>978-1-4503-7998-4<\/bdi><\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-72\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/\">&#8220;Duolingo Blog&#8221;<\/a>. May 2, 2024.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240606222324\/https:\/\/blog.duolingo.com\/\">Archived<\/a>\u00a0from the original on June 6, 2024. Retrieved\u00a0June 7,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-73\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/new-subjects\/\">&#8220;Duolingo is bringing language, math, and music under one roof!&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. October 11, 2023. Retrieved\u00a0April 25,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-74\">^<\/a><\/strong>\u00a0Olson, Parmy (January 22, 2014).\u00a0<a href=\"https:\/\/www.forbes.com\/sites\/parmyolson\/2014\/01\/22\/crowdsourcing-capitalists-how-duolingos-founders-offered-free-education-to-millions\/\">&#8220;Crowdsourcing Capitalists: How Duolingo&#8217;s Founders Offered Free Education To Millions&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Forbes\">Forbes<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20140127012240\/https:\/\/www.forbes.com\/sites\/parmyolson\/2014\/01\/22\/crowdsourcing-capitalists-how-duolingos-founders-offered-free-education-to-millions\/\">Archived<\/a>\u00a0from the original on January 27, 2014. Retrieved\u00a0December 22,\u00a02015.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-75\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/support.duolingo.com\/hc\/en-us\/articles\/115004068043-What-is-Super-Duolingo-\">&#8220;What is Super Duolingo?&#8221;<\/a>.\u00a0<em>Duolingo Help Center<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230929161814\/https:\/\/support.duolingo.com\/hc\/en-us\/articles\/115004068043-What-is-Super-Duolingo-\">Archived<\/a>\u00a0from the original on September 29, 2023. Retrieved\u00a0July 16,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-76\">^<\/a><\/strong>\u00a0Bodge, Edwin; Peterson, Bill (March 14, 2023).\u00a0<a href=\"https:\/\/openai.com\/customer-stories\/duolingo\">&#8220;OpenAI customer story: Duolingo&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/OpenAI\">OpenAI<\/a><\/em>. Retrieved\u00a0April 24,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-77\">^<\/a><\/strong>\u00a0Matt (May 25, 2023).\u00a0<a href=\"https:\/\/duoplanet.com\/how-to-get-duolingo-max\/\">&#8220;How To Get Duolingo Max (Step-by-Step Guide)&#8221;<\/a>.\u00a0<em>duoplanet<\/em>. u\/michaelfarrar for the contributions. Retrieved\u00a0April 24,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-78\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/teachmama.com\/learn-to-read-app\/\">&#8220;Make screentime COUNT for your kids!&#8221;<\/a>.\u00a0<em>teach mama<\/em>. September 15, 2020.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220710202918\/https:\/\/teachmama.com\/learn-to-read-app\/\">Archived<\/a>\u00a0from the original on July 10, 2022. Retrieved\u00a0May 31,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-79\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/duolingo-abc-unlocking-the-magic-of-reading\/\">&#8220;Duolingo ABC: Unlocking the magic of reading&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. August 26, 2020.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220518162935\/https:\/\/blog.duolingo.com\/duolingo-abc-unlocking-the-magic-of-reading\/\">Archived<\/a>\u00a0from the original on May 18, 2022. Retrieved\u00a0May 31,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-80\">^<\/a><\/strong>\u00a0Siegel, Sammi (August 27, 2022).\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=ejr7g6riodk&amp;ab_channel=Duolingo\"><em>Duolingo&#8217;s Path to Math! \u2022 Sammi Siegel \u2022 Duocon 2022<\/em><\/a>\u00a0(Video). Duocon 2022. Duolingo \u2013 via YouTube.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-81\">^<\/a><\/strong>\u00a0Cesar Cadenas (March 21, 2023).\u00a0<a href=\"https:\/\/www.techradar.com\/news\/is-duolingo-building-a-new-music-learning-app-we-interpret-the-signs\">&#8220;Is Duolingo building a new music-learning app? We interpret the signs&#8221;<\/a>.\u00a0<em>TechRadar<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231011084312\/https:\/\/www.techradar.com\/news\/is-duolingo-building-a-new-music-learning-app-we-interpret-the-signs\">Archived<\/a>\u00a0from the original on October 11, 2023. Retrieved\u00a0October 11,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-82\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.engadget.com\/duolingo-will-soon-offer-gamified-music-lessons-120010824.html\">&#8220;Duolingo will soon offer gamified music lessons&#8221;<\/a>.\u00a0<em>Engadget<\/em>. September 6, 2023.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231008080039\/https:\/\/www.engadget.com\/duolingo-will-soon-offer-gamified-music-lessons-120010824.html\">Archived<\/a>\u00a0from the original on October 8, 2023. Retrieved\u00a0October 6,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-83\">^<\/a><\/strong>\u00a0Perez, Sarah (September 6, 2023).\u00a0<a href=\"https:\/\/techcrunch.com\/2023\/09\/06\/duolingo-confirms-its-app-will-soon-include-both-math-and-music-lessons\/\">&#8220;Duolingo confirms its app will soon include both math and music lessons&#8221;<\/a>.\u00a0<em>TechCrunch<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231007163720\/https:\/\/techcrunch.com\/2023\/09\/06\/duolingo-confirms-its-app-will-soon-include-both-math-and-music-lessons\/\">Archived<\/a>\u00a0from the original on October 7, 2023. Retrieved\u00a0October 6,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-84\">^<\/a><\/strong>\u00a0Cesar Cadenas (October 11, 2023).\u00a0<a href=\"https:\/\/www.techradar.com\/computing\/software\/duolingos-new-music-platform-will-teach-you-the-basics-of-playing-tunes\">&#8220;Duolingo&#8217;s new Music platform will teach you the basics of playing tunes&#8221;<\/a>.\u00a0<em>TechRadar<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231011110233\/https:\/\/www.techradar.com\/computing\/software\/duolingos-new-music-platform-will-teach-you-the-basics-of-playing-tunes\">Archived<\/a>\u00a0from the original on October 11, 2023. Retrieved\u00a0October 11,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-85\">^<\/a><\/strong>\u00a0Elsas-Queen (July 11, 2024).\u00a0<a href=\"https:\/\/www.reddit.com\/r\/duolingo\/comments\/1e10hy5\/music_and_math_lessons_are_finally_available_on\/\">&#8220;Music and math lessons are finally available on Android&#8221;<\/a>.\u00a0<em>r\/duolingo<\/em>. Retrieved\u00a0July 12,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-86\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/popular-songs-music-course\/\">&#8220;New in Music: play songs by your favorite artists&#8221;<\/a>.\u00a0<em>Duolingo Blog<\/em>. August 15, 2024. Retrieved\u00a0August 15,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-87\">^<\/a><\/strong>\u00a0Lal, Preeti Verma (March 10, 2024).\u00a0<a href=\"https:\/\/www.hindustantimes.com\/education\/study-abroad-all-about-duolingo-english-test-accepted-by-over-5-000-programs-worldwide-101710053253295.html\">&#8220;Study Abroad: All About Duolingo English Test accepted by over 5,000 programs worldwide&#8221;<\/a>.\u00a0<em>Hindustan Times<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240606033437\/https:\/\/www.hindustantimes.com\/education\/study-abroad-all-about-duolingo-english-test-accepted-by-over-5-000-programs-worldwide-101710053253295.html\">Archived<\/a>\u00a0from the original on June 6, 2024. Retrieved\u00a0June 7,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-88\">^<\/a><\/strong>\u00a0Durrani, Anayat (December 8, 2023).\u00a0<a href=\"https:\/\/www.usnews.com\/education\/best-global-universities\/articles\/duolingo-english-test-and-u-s-college-admissions\">&#8220;Duolingo English Test and U.S. College Admissions&#8221;<\/a>.\u00a0<em>U.S. News &amp; World Report<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240526041815\/https:\/\/www.usnews.com\/education\/best-global-universities\/articles\/duolingo-english-test-and-u-s-college-admissions\">Archived<\/a>\u00a0from the original on May 26, 2024. Retrieved\u00a0June 7,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-89\">^<\/a><\/strong>\u00a0Shijia, Ouyang (December 13, 2019).\u00a0<a href=\"https:\/\/www.chinadaily.com.cn\/a\/201912\/13\/WS5df2ebe7a310cf3e3557de46.html\">&#8220;Language-learning app Duolingo bullish on Chinese market&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/China_Daily\">China Daily<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191214041809\/https:\/\/www.chinadaily.com.cn\/a\/201912\/13\/WS5df2ebe7a310cf3e3557de46.html\">Archived<\/a>\u00a0from the original on December 14, 2019. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-Adams_90-0\">^<\/a><\/strong>\u00a0Adams, Susan.\u00a0<a href=\"https:\/\/www.forbes.com\/sites\/susanadams\/2019\/07\/16\/game-of-tongues-how-duolingo-built-a-700-million-business-with-its-addictive-language-learning-app\/\">&#8220;Game of Tongues: How Duolingo Built A $700 Million Business With Its Addictive Language-Learning App&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Forbes\">Forbes<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190723122302\/https:\/\/www.forbes.com\/sites\/susanadams\/2019\/07\/16\/game-of-tongues-how-duolingo-built-a-700-million-business-with-its-addictive-language-learning-app\/\">Archived<\/a>\u00a0from the original on July 23, 2019. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-91\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/finance.yahoo.com\/video\/duolingo-ceo-talks-earnings-paid-144115465.html\">&#8220;Duolingo CEO talks earnings, paid subscribers, and the stock&#8217;s performance&#8221;<\/a>.\u00a0<em>Yahoo! Finance<\/em>\u00a0(an article with a transcription from a video report). May 19, 2022.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220519145317\/https:\/\/finance.yahoo.com\/video\/duolingo-ceo-talks-earnings-paid-144115465.html\">Archived<\/a>\u00a0from the original on May 19, 2022. Retrieved\u00a0August 8,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-92\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/investors.duolingo.com\/static-files\/d667f9d1-8f7f-418c-b116-e699a30a9826\">&#8220;Duolingo shareholder letter 2022&#8221;<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220512201622\/https:\/\/investors.duolingo.com\/static-files\/d667f9d1-8f7f-418c-b116-e699a30a9826\">Archived<\/a>\u00a0from the original on May 12, 2022. Retrieved\u00a0May 28,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-93\">^<\/a><\/strong>\u00a0Doughty, Nate (April 8, 2020).\u00a0<a href=\"https:\/\/www.bizjournals.com\/pittsburgh\/news\/2020\/04\/08\/duolingo-passes-one-million-paid-users-expands.html\">&#8220;Duolingo passes one million paid users, expands with new hires&#8221;<\/a>.\u00a0<em>Pittsburgh Business Times<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20210122184639\/https:\/\/www.bizjournals.com\/pittsburgh\/news\/2020\/04\/08\/duolingo-passes-one-million-paid-users-expands.html\">Archived<\/a>\u00a0from the original on January 22, 2021. Retrieved\u00a0December 12,\u00a02020.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-94\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.nasdaq.com\/press-release\/duolingo-announces-record-bookings-in-first-quarter-2022-and-raises-full-year\">&#8220;Duolingo Announces Record Bookings in First Quarter 2022 and Raises Full Year Guidance&#8221;<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20220525040104\/https:\/\/www.nasdaq.com\/press-release\/duolingo-announces-record-bookings-in-first-quarter-2022-and-raises-full-year\">Archived<\/a>\u00a0from the original on May 25, 2022. Retrieved\u00a0May 25,\u00a02022.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-95\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/investors.duolingo.com\/static-files\/3c5dd359-4936-452a-9d9f-9a8c853c06c0\">&#8220;Duolingo Reports 62% DAU Growth, 42% Revenue Growth, and Increased Profitability in First Quarter 2023; Raises Full Year Guidance&#8221;<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230531171944\/https:\/\/investors.duolingo.com\/static-files\/3c5dd359-4936-452a-9d9f-9a8c853c06c0\">Archived<\/a>\u00a0from the original on May 31, 2023. Retrieved\u00a0May 31,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-96\">^<\/a><\/strong>\u00a0Rachels, Jason R.; Rockinson-Szapkiw, Amanda J. (2018). &#8220;The effects of a mobile gamification app on elementary students&#8217; Spanish achievement and self-efficacy&#8221;.\u00a0<em>Computer Assisted Language Learning<\/em>.\u00a0<strong>31<\/strong>\u00a0(1\u20132).\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Routledge\">Routledge<\/a>: 72\u201389.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Doi_(identifier)\">doi<\/a>:<a href=\"https:\/\/doi.org\/10.1080%2F09588221.2017.1382536\">10.1080\/09588221.2017.1382536<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/S2CID_(identifier)\">S2CID<\/a>\u00a0<a href=\"https:\/\/api.semanticscholar.org\/CorpusID:67064098\">67064098<\/a>.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:6_97-0\">Jump up to:<sup><em><strong>a<\/strong><\/em><\/sup><\/a>\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-:6_97-1\"><sup><em><strong>b<\/strong><\/em><\/sup><\/a>\u00a0Hu, Jane C. (November 29, 2021).\u00a0<a href=\"https:\/\/slate.com\/technology\/2021\/11\/duolingo-weird-sentences-linguistics.html\">&#8220;Why Are Duolingo&#8217;s Sentences So Weird?&#8221;<\/a>.\u00a0<em>Slate<\/em>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/ISSN_(identifier)\">ISSN<\/a>\u00a0<a href=\"https:\/\/search.worldcat.org\/issn\/1091-2339\">1091-2339<\/a>. Retrieved\u00a0July 26,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-98\">^<\/a><\/strong>\u00a0Loof, Esther De; Ergo, Kate; Naert, Lien; Janssens, Clio; Talsma, Durk; Opstal, Filip Van; Verguts, Tom (January 2, 2018).\u00a0<a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC5749691\">&#8220;Signed reward prediction errors drive declarative learning&#8221;<\/a>.\u00a0<em>PLOS ONE<\/em>.\u00a0<strong>13<\/strong>\u00a0(1): e0189212.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Bibcode_(identifier)\">Bibcode<\/a>:<a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2018PLoSO..1389212D\">2018PLoSO..1389212D<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Doi_(identifier)\">doi<\/a>:<a href=\"https:\/\/doi.org\/10.1371%2Fjournal.pone.0189212\">10.1371\/journal.pone.0189212<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/ISSN_(identifier)\">ISSN<\/a>\u00a0<a href=\"https:\/\/search.worldcat.org\/issn\/1932-6203\">1932-6203<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/PMC_(identifier)\">PMC<\/a>\u00a0<a href=\"https:\/\/www.ncbi.nlm.nih.gov\/pmc\/articles\/PMC5749691\">5749691<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/PMID_(identifier)\">PMID<\/a>\u00a0<a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/29293493\">29293493<\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-99\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/016763939600026X?via%3Dihub\">The SUS test: A method for the assessment of text-to-speech synthesis intelligibility using Semantically Unpredictable Sentences<\/a>\u00a0June 1996, Speech Communication 18(4):381-392, 18(4):381-392<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-100\">^<\/a><\/strong>\u00a0Jiang, Xiangying; Rollinson, Joseph; Plonsky, Luke; Gustafson, Erin; Pajak, Bozena (January 11, 2022).\u00a0<a href=\"https:\/\/doi.org\/10.1111%2Fflan.12600\">&#8220;Evaluating the reading and listening outcomes of beginning-level Duolingo courses&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Foreign_Language_Annals\">Foreign Language Annals<\/a><\/em>.\u00a0<strong>54<\/strong>\u00a0(4): 974\u20131002.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Doi_(identifier)\">doi<\/a>:<a href=\"https:\/\/doi.org\/10.1111%2Fflan.12600\">10.1111\/flan.12600<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/ISSN_(identifier)\">ISSN<\/a>\u00a0<a href=\"https:\/\/search.worldcat.org\/issn\/0015-718X\">0015-718X<\/a>.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/S2CID_(identifier)\">S2CID<\/a>\u00a0<a href=\"https:\/\/api.semanticscholar.org\/CorpusID:245892888\">245892888<\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-101\">^<\/a><\/strong>\u00a0Saad, Suziana Mat; Rahim, Nur Ameera Abd (2022).\u00a0<a href=\"https:\/\/ejournal.ukm.my\/ebangi\/article\/view\/54226\/12880\">&#8220;Vocabulary Acquisition Using Duolingo in French Language Learning: A Malaysian Context&#8221;<\/a>.\u00a0<em>E-Bangi: Journal of Social Sciences &amp; Humanities<\/em>.\u00a0<strong>19<\/strong>\u00a0(2): 256\u2013281.\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/EISSN_(identifier)\">eISSN<\/a>\u00a0<a href=\"https:\/\/search.worldcat.org\/issn\/1823-884X\">1823-884X<\/a>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-102\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.duolingo.com\/efficacy\">&#8220;Duolingo Really Works &#8211; Learn more about how Duolingo works for learners&#8221;<\/a>.\u00a0<em>Duolingo<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240530223517\/https:\/\/www.duolingo.com\/efficacy\">Archived<\/a>\u00a0from the original on May 30, 2024. Retrieved\u00a0June 6,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-103\">^<\/a><\/strong>\u00a0Jiang, Xiangying; Chen, Haoyu; Portnof, Lucy; Gustafson, Erin; Rollinson, Joseph; Plonsky, Luke; Pajak, Bozena (November 11, 2021).\u00a0<a href=\"https:\/\/duolingo-papers.s3.amazonaws.com\/reports\/Duolingo_whitepaper_language_read_listen_2021.pdf\">&#8220;Finishing half of B1 on Duolingo comparable to five university semesters in reading and listening&#8221;<\/a>\u00a0(PDF).\u00a0<em>Duolingo<\/em>. DRR-21-03.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240602232722\/https:\/\/duolingo-papers.s3.amazonaws.com\/reports\/Duolingo_whitepaper_language_read_listen_2021.pdf\">Archived<\/a>\u00a0(PDF)\u00a0from the original on June 2, 2024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-104\">^<\/a><\/strong>\u00a0Rodr\u00edguez-Fuentes, Rodrigo A.; Swatek, Aleksandra (December 14, 2023). Ariel, Robert; Jiang, Xiangying (eds.).\u00a0<a href=\"https:\/\/duolingo-papers.s3.amazonaws.com\/reports\/RodriguezFuentes_etal_whitepaper_language_proficiency_Columbia_2023.pdf\">&#8220;A Comparison Between Classroom and MALL Instruction with Duolingo: Learning English at the A2 CEFR Level&#8221;<\/a>\u00a0(PDF).\u00a0<em>Amazon Web Services<\/em>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-105\">^<\/a><\/strong>\u00a0Gonz\u00e1lez-Fern\u00e1ndez, Beatriz (November 30, 2023).\u00a0<a href=\"https:\/\/duolingo-papers.s3.amazonaws.com\/reports\/GonzalezFernandez_whitepaper_language_proficiency_Spain_2023.pdf\">&#8220;The effectiveness of Duolingo vs. classroom instruction on Spanish speakers&#8217; L2 English proficiency and lexical development&#8221;<\/a>\u00a0(PDF).\u00a0<em>Amazon Web Services<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240602133716\/https:\/\/duolingo-papers.s3.amazonaws.com\/reports\/GonzalezFernandez_whitepaper_language_proficiency_Spain_2023.pdf\">Archived<\/a>\u00a0(PDF)\u00a0from the original on June 2, 2024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-106\">^<\/a><\/strong>\u00a0Heaney, Katie (January 25, 2019).\u00a0<a href=\"https:\/\/www.thecut.com\/2019\/01\/does-duolingo-even-work.html\">&#8220;Is It Just Me, or Does Duolingo Not Work?&#8221;<\/a>.\u00a0<em>The Cut<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190709193541\/https:\/\/www.thecut.com\/2019\/01\/does-duolingo-even-work.html\">Archived<\/a>\u00a0from the original on July 9, 2019. Retrieved\u00a0November 24,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-107\">^<\/a><\/strong>\u00a0Ravenscraft, Eric (May 4, 2019).\u00a0<a href=\"https:\/\/www.nytimes.com\/2019\/05\/04\/smarter-living\/500-days-of-duolingo-what-you-can-and-cant-learn-from-a-language-app.html\">&#8220;500 Days of Duolingo: What You Can (and Can&#8217;t) Learn From a Language App&#8221;<\/a>.\u00a0<em>The New York Times<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231124181834\/https:\/\/www.nytimes.com\/2019\/05\/04\/smarter-living\/500-days-of-duolingo-what-you-can-and-cant-learn-from-a-language-app.html\">Archived<\/a>\u00a0from the original on November 24, 2023. Retrieved\u00a0November 24,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-kotaku-cheaters_108-0\">^<\/a><\/strong>\u00a0Guthrie, Robert (June 5, 2023).\u00a0<a href=\"https:\/\/kotaku.com\/duolingo-app-cheats-hacks-leagues-xp-why-duohacker-1850506482\">&#8220;Duolingo Is An App For Language-Learning, So Why Is It Plagued With Cheaters?&#8221;<\/a>.\u00a0<em>Kotaku<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230606135117\/https:\/\/kotaku.com\/duolingo-app-cheats-hacks-leagues-xp-why-duohacker-1850506482\">Archived<\/a>\u00a0from the original on June 6, 2023. Retrieved\u00a0June 6,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-109\">^<\/a><\/strong>\u00a0Kaufmann, Steve (May 24, 2017).\u00a0<a href=\"https:\/\/medium.com\/@lingosteve\/duolingo-review-does-the-resource-offer-compelling-content-4cbf3f5fbf93\">&#8220;Duolingo Review: Does the Resource Offer Compelling Content?&#8221;<\/a>.\u00a0<em>Medium<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191112180902\/https:\/\/medium.com\/@lingosteve\/duolingo-review-does-the-resource-offer-compelling-content-4cbf3f5fbf93\">Archived<\/a>\u00a0from the original on November 12, 2019. Retrieved\u00a0June 6,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-110\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240304092005\/https:\/\/support.duolingo.com\/hc\/en-us\/articles\/4424678300301-Forum-Announcement-FAQ\">&#8220;Forum Announcement + FAQ&#8221;<\/a>.\u00a0<em><a>Duolingo<\/a><\/em>. Archived from\u00a0<a href=\"https:\/\/support.duolingo.com\/hc\/en-us\/articles\/4424678300301-Forum-Announcement-FAQ\">the original<\/a>\u00a0on March 4, 2024. Retrieved\u00a0June 6,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-111\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/support.duolingo.com\/hc\/en-us\/articles\/204752124-How-do-I-report-a-problem-with-a-sentence-or-translation\">&#8220;How do I report a problem with a sentence or translation?&#8221;<\/a>.\u00a0<em><a>Duolingo<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230923031515\/https:\/\/support.duolingo.com\/hc\/en-us\/articles\/204752124-How-do-I-report-a-problem-with-a-sentence-or-translation-\">Archived<\/a>\u00a0from the original on September 23, 2023. Retrieved\u00a0August 12,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-112\">^<\/a><\/strong>\u00a0Greig, Jonathan (January 24, 2023).\u00a0<a href=\"https:\/\/therecord.media\/duolingo-investigating-dark-web-post-offering-data-from-2-6-million-accounts\">&#8220;DuoLingo investigating dark web post offering data from 2.6 million accounts&#8221;<\/a>.\u00a0<em>The Record<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231012025712\/https:\/\/therecord.media\/duolingo-investigating-dark-web-post-offering-data-from-2-6-million-accounts\">Archived<\/a>\u00a0from the original on October 12, 2023. Retrieved\u00a0June 6,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-113\">^<\/a><\/strong>\u00a0Mascellino, Alessandro (August 24, 2023).\u00a0<a href=\"https:\/\/www.infosecurity-magazine.com\/news\/data-26m-duolingo-users-leaked\/\">&#8220;Data of 2.6M Duolingo Users Leaked on Hacking Forum&#8221;<\/a>.\u00a0<em>Infosecurity Magazine<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240221023819\/https:\/\/www.infosecurity-magazine.com\/news\/data-26m-duolingo-users-leaked\/\">Archived<\/a>\u00a0from the original on February 21, 2024. Retrieved\u00a0June 6,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-114\">^<\/a><\/strong>\u00a0Naprys, Ernestas (November 15, 2023).\u00a0<a href=\"https:\/\/cybernews.com\/security\/hackers-exposed-duolingo-users-more-available-scraping\/\">&#8220;Hackers exposed 2.6 million Duolingo users, more available for scraping&#8221;<\/a>.\u00a0<em>Cybernews<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240303083615\/https:\/\/cybernews.com\/security\/hackers-exposed-duolingo-users-more-available-scraping\/\">Archived<\/a>\u00a0from the original on March 3, 2024. Retrieved\u00a0June 6,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-115\">^<\/a><\/strong>\u00a0McCarthy, James; Evans, Owain (October 24, 2023).\u00a0<a href=\"https:\/\/www.bbc.com\/news\/uk-wales-67197462\">&#8220;Welsh course to be &#8216;paused&#8217; on language app Duolingo&#8221;<\/a>. Additional reporting by Dan Moffat. BBC.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240210181414\/https:\/\/www.bbc.com\/news\/uk-wales-67197462\">Archived<\/a>\u00a0from the original on February 10, 2024. Retrieved\u00a0March 27,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-116\">^<\/a><\/strong>\u00a0Aitken, Catriona (October 30, 2023).\u00a0<a href=\"https:\/\/www.bbc.com\/news\/uk-wales-67260479\">&#8220;Duolingo: Language app boss to help Welsh language goal&#8221;<\/a>.\u00a0<em>BBC News<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20240404153208\/https:\/\/www.bbc.com\/news\/uk-wales-67260479\">Archived<\/a>\u00a0from the original on April 4, 2024. Retrieved\u00a0June 7,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-gigaom_117-0\">^<\/a><\/strong>\u00a0Hockenson, Lauren (December 17, 2013).\u00a0<a href=\"https:\/\/web.archive.org\/web\/20201112020859\/https:\/\/gigaom.com\/2013\/12\/17\/duolingo-snags-iphone-app-of-the-year\/\">&#8220;Duolingo snags iPhone App of the Year&#8221;<\/a>. Gigaom. Archived from\u00a0<a href=\"http:\/\/gigaom.com\/2013\/12\/17\/duolingo-snags-iphone-app-of-the-year\/\">the original<\/a>\u00a0on November 12, 2020. Retrieved\u00a0February 21,\u00a02014.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-118\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.fastcompany.com\/most-innovative-companies\/2013\/sectors\/education\">&#8220;The World&#8217;s Most Innovative Companies 2013: Education Honorees&#8221;<\/a>.\u00a0<em>Fast Company<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190723152111\/https:\/\/www.fastcompany.com\/most-innovative-companies\/2013\/sectors\/education\">Archived<\/a>\u00a0from the original on July 23, 2019. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-119\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.fastcompany.com\/most-innovative-companies\/2017\/sectors\/education\">&#8220;The World&#8217;s Most Innovative Companies 2017: Education Honorees&#8221;<\/a>.\u00a0<em>Fast Company<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20200110033354\/https:\/\/www.fastcompany.com\/most-innovative-companies\/2017\/sectors\/education\">Archived<\/a>\u00a0from the original on January 10, 2020. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-120\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.fastcompany.com\/most-innovative-companies\/2017\/sectors\/social-media\">&#8220;The World&#8217;s Most Innovative Companies 2017: Social Media Honorees&#8221;<\/a>.\u00a0<em>Fast Company<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20200110033524\/https:\/\/www.fastcompany.com\/most-innovative-companies\/2017\/sectors\/social-media\">Archived<\/a>\u00a0from the original on January 10, 2020. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-duolingo.com_121-0\">^<\/a><\/strong>\u00a0Luis.\u00a0<a href=\"https:\/\/www.duolingo.com\/comment\/3412629\">&#8220;Duolingo turns two today!&#8221;<\/a>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20180219031308\/https:\/\/www.duolingo.com\/comment\/3412629\">Archived<\/a>\u00a0from the original on February 19, 2018. Retrieved\u00a0November 21,\u00a02014.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-122\">^<\/a><\/strong>\u00a0Empson, Rip (February 12, 2014).\u00a0<a href=\"https:\/\/techcrunch.com\/2014\/02\/11\/fast-growing-duolingo-caps-off-a-big-year-with-the-crunchie-for-best-education-startup\/\">&#8220;Fast-Growing Duolingo Caps Off A Big Year With The Crunchie For &#8220;Best Education Startup&#8221;&#8221;<\/a>.\u00a0<em>TechCrunch<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231216113924\/https:\/\/techcrunch.com\/2014\/02\/11\/fast-growing-duolingo-caps-off-a-big-year-with-the-crunchie-for-best-education-startup\/\">Archived<\/a>\u00a0from the original on December 16, 2023. Retrieved\u00a0October 6,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-TNW_123-0\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/thenextweb.com\/apps\/2014\/12\/11\/google-play-remembers-year-entertainment\/\">&#8220;Google Play reveals the most downloaded apps, games and entertainment content from 2014&#8221;<\/a>. Story by Abhimanyu Ghoshal. The Next Web. December 11, 2014.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20201129215519\/https:\/\/thenextweb.com\/apps\/2014\/12\/11\/google-play-remembers-year-entertainment\/\">Archived<\/a>\u00a0from the original on November 29, 2020. Retrieved\u00a0December 29,\u00a02014.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-124\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.pcmag.com\/reviews\/duolingo\">&#8220;Duolingo Review&#8221;<\/a>.\u00a0<em>PCMAG<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20210826005718\/https:\/\/www.pcmag.com\/reviews\/duolingo\">Archived<\/a>\u00a0from the original on August 26, 2021. Retrieved\u00a0August 26,\u00a02021.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-125\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/theindexproject.org\/award\/winnersandfinalists\/duolingo-index-award-2015-winner-play-learning-category\">&#8220;Duolingo&#8221;<\/a>.\u00a0<em>theindexproject.org<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231106225231\/https:\/\/theindexproject.org\/award\/winnersandfinalists\/duolingo-index-award-2015-winner-play-learning-category\">Archived<\/a>\u00a0from the original on November 6, 2023. Retrieved\u00a0October 6,\u00a02023.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-126\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.inc.com\/profile\/duolingo\">&#8220;Duolingo&#8221;<\/a>.\u00a0<em>Inc.com<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190801163729\/https:\/\/www.inc.com\/profile\/duolingo\">Archived<\/a>\u00a0from the original on August 1, 2019. Retrieved\u00a0August 1,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-127\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230204065617\/https:\/\/www.entrepreneur.com\/top-company-culture\">&#8220;Top Company Cultures of 2018&#8221;<\/a>.\u00a0<em>Entrepreneur<\/em>. Archived from\u00a0<a href=\"https:\/\/www.entrepreneur.com\/top-company-culture\">the original<\/a>\u00a0on February 4, 2023. Retrieved\u00a0August 1,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-128\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.cnbc.com\/2018\/05\/22\/duolingo-2018-disruptor-50.html\">&#8220;2018 Disruptor 50: No. 35 Duolingo&#8221;<\/a>.\u00a0<em>CNBC<\/em>. May 22, 2018.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20181105202606\/https:\/\/www.cnbc.com\/2018\/05\/22\/duolingo-2018-disruptor-50.html\">Archived<\/a>\u00a0from the original on November 5, 2018. Retrieved\u00a0November 5,\u00a02018.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-129\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.cnbc.com\/2019\/05\/14\/duolingo-2019-disruptor-50.html\">&#8220;Duolingo: 2019 Disruptor 50 List&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/CNBC\">CNBC<\/a><\/em>. May 15, 2019.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191007170418\/https:\/\/www.cnbc.com\/2019\/05\/14\/duolingo-2019-disruptor-50.html\">Archived<\/a>\u00a0from the original on October 7, 2019. Retrieved\u00a0September 4,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-130\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.prnewswire.com\/news-releases\/duolingo-names-gillian-munson-to-board-of-directors-300931393.html\">&#8220;Duolingo Names Gillian Munson to Board of Directors&#8221;<\/a>.\u00a0<em>PR Newswire<\/em>\u00a0(Press release). October 7, 2019.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191120154202\/https:\/\/www.prnewswire.com\/news-releases\/duolingo-names-gillian-munson-to-board-of-directors-300931393.html\">Archived<\/a>\u00a0from the original on November 20, 2019. Retrieved\u00a0December 14,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-131\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/time.com\/collection\/genius-companies-2018\/5412500\/duolingo\/\">&#8220;Duolingo: The 50 Most Genius Companies of 2018&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Time_(magazine)\">Time<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20181108220506\/http:\/\/time.com\/collection\/genius-companies-2018\/5412500\/duolingo\/\">Archived<\/a>\u00a0from the original on November 8, 2018. Retrieved\u00a0November 5,\u00a02018.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-132\">^<\/a><\/strong>\u00a0Feldman, Amy.\u00a0<a href=\"https:\/\/www.forbes.com\/sites\/amyfeldman\/2019\/07\/16\/next-billion-dollar-startups-2019\/\">&#8220;Next Billion-Dollar Startups 2019&#8221;<\/a>.\u00a0<em>Forbes<\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190720195522\/https:\/\/www.forbes.com\/sites\/amyfeldman\/2019\/07\/16\/next-billion-dollar-startups-2019\/\">Archived<\/a>\u00a0from the original on July 20, 2019. Retrieved\u00a0July 20,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-133\">^<\/a><\/strong>\u00a0T., Puja; Ghadashi, S.; Sethi, N. N. (June 9, 2023).\u00a0<a href=\"https:\/\/web.archive.org\/web\/20231004135637\/https:\/\/glamsham.com\/world\/technology\/duolingo-wins-apple-design-award-for-innovation-in-design\">&#8220;Duolingo wins Apple Design Award for innovation in design&#8221;<\/a>.\u00a0<em>Glamsham<\/em>. Archived from\u00a0<a href=\"https:\/\/glamsham.com\/world\/technology\/duolingo-wins-apple-design-award-for-innovation-in-design\">the original<\/a>\u00a0on October 4, 2023. Retrieved\u00a0June 7,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-134\">^<\/a><\/strong>\u00a0Duolingo (September 26, 2020).\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=m-3-D7S0piw\"><em>Creating Our Duolingo Characters \u2022 Greg Hartman \u2022 Duocon 2020<\/em><\/a>. Retrieved\u00a0July 24,\u00a02024\u00a0\u2013 via YouTube.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-135\">^<\/a><\/strong>\u00a0Anderson, Sage (March 27, 2019).\u00a0<a href=\"https:\/\/mashable.com\/article\/duolingo-owl-memes\/\">&#8220;The Duolingo owl is out for vengeance in these threatening memes&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Mashable\">Mashable<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20210104162637\/https:\/\/mashable.com\/article\/duolingo-owl-memes\/\">Archived<\/a>\u00a0from the original on January 4, 2021. Retrieved\u00a0June 7,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-136\">^<\/a><\/strong>\u00a0Gibbs, Alice (December 5, 2023).\u00a0<a href=\"https:\/\/www.newsweek.com\/threatening-note-duolingo-owl-internet-stitches-1849686\">&#8220;Threatening note from the Duolingo owl leaves internet in stitches&#8221;<\/a>.\u00a0<em>Newsweek<\/em>. Retrieved\u00a0June 25,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-137\">^<\/a><\/strong>\u00a0Bajaj, Sunil (November 23, 2023).\u00a0<a href=\"https:\/\/www.contagious.com\/news-and-views\/duolingo-social-media-marketing\">&#8220;How a 23-year-old graduate helped transform Duolingo&#8217;s social media marketing&#8221;<\/a>.\u00a0<em>Contagious<\/em>. Retrieved\u00a0April 13,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-138\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=8wc83qX6oNM\"><em>Introducing Duolingo Push<\/em><\/a>. Duolingo. March 31, 2019.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20230218131458\/https:\/\/www.youtube.com\/watch?v=8wc83qX6oNM\">Archived<\/a>\u00a0from the original on February 18, 2023. Retrieved\u00a0June 7,\u00a02019\u00a0\u2013 via YouTube.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-139\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20190607075051\/https:\/\/www.rypl.io\/post\/what-is-the-duolingo-meme-craze-and-what-marketers-can-learn-from-it\">&#8220;How Duolingo Took over the Meme World and What Marketers Can Learn from It&#8221;<\/a>.\u00a0<em>rypl.io<\/em>. April 30, 2019. Archived from\u00a0<a href=\"https:\/\/www.rypl.io\/post\/what-is-the-duolingo-meme-craze-and-what-marketers-can-learn-from-it\">the original<\/a>\u00a0on June 7, 2019. Retrieved\u00a0June 7,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-140\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=ga3ttnz3nXI\">&#8220;Lawyer Fights Duolingo Owl for $2,700,000&#8221;<\/a>. Duolingo. April 1, 2022. Retrieved\u00a0April 13,\u00a02024\u00a0\u2013 via YouTube.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-141\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=dWXuz95uBQo\">&#8220;Spanish or Vanish (full song) from Duolingo On Ice&#8221;<\/a>. Duolingo. April 2024. Retrieved\u00a0April 13,\u00a02024\u00a0\u2013 via YouTube.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-142\">^<\/a><\/strong>\u00a0Veselic, Ana; Alexander, Anne; Chermayeff, Jessica; Gavazzi, Andrea; Goldberg, Alexander; Marotta, Lily; Register, Julia (February 18, 2020).\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=P59ceJ7vBLY&amp;ab_channel=Duolingo\"><em>Duolingo X Angry Birds 2: The Team-Up<\/em><\/a>\u00a0(Trailer). Duolingo \u2013 via YouTube.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-143\">^<\/a><\/strong>\u00a0Lee, Madasyn (November 5, 2019).\u00a0<a href=\"https:\/\/triblive.com\/local\/pittsburgh-allegheny\/pittsburgh-based-duolingo-a-fan-of-snls-talk-to-kids-skit\/\">&#8220;Pittsburgh-based Duolingo a fan of talk-to-kids &#8216;SNL&#8217; sketch&#8221;<\/a>.\u00a0<em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Pittsburgh_Tribune-Review\">Pittsburgh Tribune-Review<\/a><\/em>.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20191213075049\/https:\/\/triblive.com\/local\/pittsburgh-allegheny\/pittsburgh-based-duolingo-a-fan-of-snls-talk-to-kids-skit\/\">Archived<\/a>\u00a0from the original on December 13, 2019. Retrieved\u00a0December 13,\u00a02019.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-144\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.duolingo.com\/duocon\">&#8220;Learn a language for free&#8221;<\/a>.\u00a0<em>Duolingo<\/em>. Retrieved\u00a0August 1,\u00a02024.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Duolingo#cite_ref-145\">^<\/a><\/strong>\u00a0Perez, Sarah (July 9, 2024).\u00a0<a href=\"https:\/\/techcrunch.com\/2024\/07\/09\/duolingo-acquires-detroit-based-design-studio-hobbes\/\">&#8220;Duolingo acquires Detroit-based design studio Hobbes&#8221;<\/a>.\u00a0<em>TechCrunch<\/em>. Retrieved\u00a0July 22,\u00a02024.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u53c2\u8003\u6587\u732e\">4. \u4e2d\u6587\u8bcd\u6761\u53c2\u8003\u6587\u732e<\/h2>\n\n\n\n<ol class=\"has-small-font-size wp-block-list\">\n<li>^\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-S-1_Filing_1-0\">\u8df3\u8f6c\u5230\uff1a<sup><strong>1.0<\/strong><\/sup><\/a>\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-S-1_Filing_1-1\"><sup><strong>1.1<\/strong><\/sup><\/a>\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-S-1_Filing_1-2\"><sup><strong>1.2<\/strong><\/sup><\/a>\u00a0<a href=\"https:\/\/www.sec.gov\/Archives\/edgar\/data\/1562088\/000162828021013065\/duolingos-1.htm\">\u5b58\u6863\u526f\u672c<\/a>.\u00a0[2021-08-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20210731201505\/https:\/\/www.sec.gov\/Archives\/edgar\/data\/1562088\/000162828021013065\/duolingos-1.htm\">\u5b58\u6863<\/a>\u4e8e2021-07-31\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-active_users_2-0\">^<\/a><\/strong>\u00a0Frederic Lardinois.\u00a0<a href=\"https:\/\/techcrunch.com\/2018\/08\/01\/duolingo-hires-its-first-chief-marketing-officer-as-active-user-numbers-stagnate\/\">Duolingo hires its first chief marketing officer as active user numbers stagnate but revenue grows<\/a>.\u00a0[21 November\u00a02018]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20190505133216\/https:\/\/techcrunch.com\/2018\/08\/01\/duolingo-hires-its-first-chief-marketing-officer-as-active-user-numbers-stagnate\/\">\u5b58\u6863<\/a>\u4e8e2019-05-05\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-3\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/blog.duolingo.com\/migrating-duolingos-android-app-to-100-kotlin\">Migrating Duolingo&#8217;s Android app to 100% Kotlin<\/a>. blog.duolingo.com. 6 April 2020\u00a0[2021-08-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20201223023826\/https:\/\/blog.duolingo.com\/migrating-duolingos-android-app-to-100-kotlin\/\">\u5b58\u6863<\/a>\u4e8e2020-12-23\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-real_world_swift_4-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/making.duolingo.com\/real-world-swift\">Real World Swift \u2013 Making Duolingo Blog<\/a>. making.duolingo.com. 7 January 2015\u00a0[2021-08-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20190606014131\/https:\/\/making.duolingo.com\/real-world-swift\">\u5b58\u6863<\/a>\u4e8e2019-06-06\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-making.duolingo.com_5-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/making.duolingo.com\/rewriting-duolingos-engine-in-scala\">Rewriting Duolingo&#8217;s engine in Scala \u2013 Making Duolingo Blog<\/a>. making.duolingo.com. 31 January 2017\u00a0[2017-02-22]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20190804123312\/https:\/\/making.duolingo.com\/rewriting-duolingos-engine-in-scala\">\u5b58\u6863<\/a>\u4e8e2019-08-04\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-bizjournals201603_6-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.bizjournals.com\/pittsburgh\/news\/2016\/03\/23\/duolingo-moving-to-east-liberty-plans-to-add.html\">Duolingo moving to East Liberty, plans to add employees<\/a>. The Business Journals.\u00a0[2016-03-24]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20170531182842\/http:\/\/www.bizjournals.com\/pittsburgh\/news\/2016\/03\/23\/duolingo-moving-to-east-liberty-plans-to-add.html\">\u5b58\u6863<\/a>\u4e8e2017-05-31\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-7\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.windowsphone.com\/en-us\/store\/app\/duolingo-learn-languages-for-free\/2d89520e-d360-4b5b-ba5a-5a15064aa935\">Duolingo \u2013 Learn Languages for Free<\/a>. Windows phone. Microsoft.\u00a0[2014-11-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20150702044316\/http:\/\/www.windowsphone.com\/en-us\/store\/app\/duolingo-learn-languages-for-free\/2d89520e-d360-4b5b-ba5a-5a15064aa935\">\u5b58\u6863<\/a>\u4e8e2015-07-02\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-8\">^<\/a><\/strong>\u00a0Guliani, Parul.\u00a0<a href=\"https:\/\/www.forbes.com\/sites\/parulguliani\/2016\/07\/22\/duolingo-looks-to-dominate-the-mobile-education-market-with-new-flashcard-app\/#5530e29a63ff\">Duolingo Looks To Dominate The Mobile Education Market With New Flashcard App TinyCards<\/a>. Forbes.\u00a0[2017-02-17]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20210130074739\/https:\/\/www.forbes.com\/sites\/parulguliani\/2016\/07\/22\/duolingo-looks-to-dominate-the-mobile-education-market-with-new-flashcard-app\/#5530e29a63ff\">\u5b58\u6863<\/a>\u4e8e2021-01-30\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-9\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/expandedramblings.com\/index.php\/business-directory\/24390\/duolingo-stats-facts\/\">By the Numbers: 16 Amazing Duolingo Stats and Facts (October 2017)<\/a>. DMR.\u00a0[2017-11-06]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20171107024446\/https:\/\/expandedramblings.com\/index.php\/business-directory\/24390\/duolingo-stats-facts\/\">\u5b58\u6863<\/a>\u4e8e2017-11-07\uff09\u00a0<strong>\uff08\u7f8e\u56fd\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li>^\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-TechCrunch_Article_10-0\">\u8df3\u8f6c\u5230\uff1a<sup><strong>10.0<\/strong><\/sup><\/a>\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-TechCrunch_Article_10-1\"><sup><strong>10.1<\/strong><\/sup><\/a>\u00a0Siegler, MG.\u00a0<a href=\"http:\/\/techcrunch.com\/2011\/04\/12\/duolingo\/\">Meet Duolingo, Google&#8217;s Next Acquisition Target; Learn A Language, Help The Web<\/a>. TechCrunch. 2011-04-12\u00a0[2014-11-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20150517050503\/http:\/\/techcrunch.com\/2011\/04\/12\/duolingo\/\">\u5b58\u6863<\/a>\u4e8e2015-05-17\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-Duolingo_Team_11-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/twitpic.com\/4sjlpm\">The Duolingo Team<\/a>. Twitpic.\u00a0[2014-04-07]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20121019175309\/http:\/\/twitpic.com\/4sjlpm\">\u5b58\u6863<\/a>\u4e8e2012-10-19\uff09.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-12\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.quora.com\/What-language-is-Duolingo-written-in\">What language is Duolingo written in?<\/a>. Quora.\u00a0[2014-02-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20210217102542\/https:\/\/www.quora.com\/What-language-is-Duolingo-written-in\">\u5b58\u6863<\/a>\u4e8e2021-02-17\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-13\">^<\/a><\/strong>\u00a0Mayer-Sch\u00f6nberger, Viktor; Cukier, Kenneth.\u00a0<a href=\"https:\/\/books.google.com\/?id=OXzeAgAAQBAJ&amp;pg=PP1\">Learning with Big Data: The Future of Education<\/a>. Houghton Mifflin Harcourt. 2014: 9\u201310.\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/Special:%E7%BD%91%E7%BB%9C%E4%B9%A6%E6%BA%90\/978-0-54435550-7\">ISBN\u00a0978-0-54435550-7<\/a>\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-14\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.technologyreview.com\/computing\/37487\/\">Translating the Web While You Learn<\/a>. Technology Review.\u00a0[2013-08-26]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20111230031510\/http:\/\/www.technologyreview.com\/computing\/37487\/\">\u5b58\u6863<\/a>\u4e8e2011-12-30\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-NSFGrant_15-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.nsf.gov\/awardsearch\/showAward.do?AwardNumber=1054630\">Online Education as a Vehicle for Human Computation<\/a>. National Science Foundation.\u00a0[2014-04-07]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20191216050026\/https:\/\/www.nsf.gov\/awardsearch\/showAward?AWD_ID=1054630\">\u5b58\u6863<\/a>\u4e8e2019-12-16\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-NewScientist_16-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.newscientist.com\/article\/mg21328476.200-learn-a-language-translate-the-web.html\">Learn a language, translate the web<\/a>. NewScientist.\u00a0[2014-04-07]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20120814142705\/http:\/\/www.newscientist.com\/article\/mg21328476.200-learn-a-language-translate-the-web.html\">\u5b58\u6863<\/a>\u4e8e2012-08-14\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-pittsgazzette_17-0\">^<\/a><\/strong>\u00a0Todd, Deborah M.\u00a0<a href=\"http:\/\/www.post-gazette.com\/stories\/business\/news\/ashton-kutcher-backs-cmu-duos-startup-duolingo-641086\/\">Ashton Kutcher backs CMU duo&#8217;s startup Duolingo<\/a>. Pittsburgh Post Gazette. 2012-07-03\u00a0[2012-07-13]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20120625022913\/http:\/\/www.post-gazette.com\/stories\/business\/news\/ashton-kutcher-backs-cmu-duos-startup-duolingo-641086\/\">\u5b58\u6863<\/a>\u4e8e2012-06-25\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-DuoBlog_18-0\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20120401200917\/http:\/\/blog.duolingo.com\/post\/20142464554\/we-have-a-blog\">We have a blog!<\/a>. Duolingo Blog.\u00a0[2014-04-07]. \uff08<a href=\"http:\/\/blog.duolingo.com\/post\/20142464554\/we-have-a-blog\">\u539f\u59cb\u5185\u5bb9<\/a>\u5b58\u6863\u4e8e2012-04-01\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-19\">^<\/a><\/strong>\u00a0Adi Robertson.\u00a0<a href=\"http:\/\/www.theverge.com\/2011\/12\/16\/2639262\/duolingo-translate-internet-teach-languages\">Duolingo will translate the internet while teaching languages<\/a>.\u00a0<em><a href=\"https:\/\/zh.wikipedia.org\/wiki\/The_Verge\">The Verge<\/a><\/em>. December 16, 2011\u00a0[February 3,\u00a02016]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20201013182550\/https:\/\/www.theverge.com\/2011\/12\/16\/2639262\/duolingo-translate-internet-teach-languages\">\u5b58\u6863<\/a>\u4e8e2020-10-13\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-20\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20131212062452\/http:\/\/blog.duolingo.com\/post\/35638702323\/duolingo-on-the-go-our-iphone-app-is-here\">Duolingo on the go. Our iPhone App is here!<\/a>. Duolingo. 2012-11-13\u00a0[2012-11-27]. \uff08<a href=\"http:\/\/blog.duolingo.com\/post\/35638702323\/Duolingo-on-the-go-our-iphone-app-is-here\">\u539f\u59cb\u5185\u5bb9<\/a>\u5b58\u6863\u4e8e2013-12-12\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-TCiOS_21-0\">^<\/a><\/strong>\u00a0Frederic Lardinois.\u00a0<a href=\"http:\/\/techcrunch.com\/2012\/11\/13\/language-learning-service-duolingo-launches-its-first-iphone-app\/\">Language Learning Service Duolingo Launches Its First iPhone App<\/a>.\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/TechCrunch\">TechCrunch<\/a>.\u00a0<a href=\"https:\/\/zh.wikipedia.org\/wiki\/AOL\">AOL<\/a>. 2012-11-13\u00a0[2016-04-18]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20210116185624\/https:\/\/techcrunch.com\/2012\/11\/13\/language-learning-service-duolingo-launches-its-first-iphone-app\/\">\u5b58\u6863<\/a>\u4e8e2021-01-16\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-22\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/itunes.apple.com\/app\/duolingo-learn-spanish-french\/id570060128\">Duolingo \u2013 Learn Spanish, French, German, Portuguese, and Italian for free<\/a>. iTunes App Store. Apple.\u00a0[2013-04-29]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20190506091422\/https:\/\/itunes.apple.com\/app\/duolingo-learn-spanish-french\/id570060128\">\u5b58\u6863<\/a>\u4e8e2019-05-06\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-gigaom_23-0\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/gigaom.com\/2013\/12\/17\/duolingo-snags-iphone-app-of-the-year\/\">Duolingo snags iPhone App of the Year<\/a>. Gigaom.com. 2013-12-17\u00a0[2014-02-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20201112020859\/https:\/\/gigaom.com\/2013\/12\/17\/duolingo-snags-iphone-app-of-the-year\/\">\u5b58\u6863<\/a>\u4e8e2020-11-12\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-24\">^<\/a><\/strong>\u00a0Farber, Dan.\u00a0<a href=\"http:\/\/news.cnet.com\/8301-1023_3-57593078-93\/Duolingo-brings-free-language-courses-to-the-ipad\/\">Duolingo brings free language courses to the iPad<\/a>. News.cnet.com. 2013-07-11\u00a0[2014-02-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20190421184610\/https:\/\/www.cnet.com\/news\/duolingo-brings-free-language-courses-to-the-ipad\/\">\u5b58\u6863<\/a>\u4e8e2019-04-21\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-25\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.bizjournals.com\/pittsburgh\/blog\/innovation\/2013\/05\/Duolingo-launching-on-android-signing.html?page=all\">Duolingo launching on Android; plans move to bigger office<\/a>. Bizjournals.com. 2013-05-29\u00a0[2014-02-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20200811165651\/https:\/\/www.bizjournals.com\/pittsburgh\/blog\/innovation\/2013\/05\/Duolingo-launching-on-android-signing.html?page=all\">\u5b58\u6863<\/a>\u4e8e2020-08-11\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-26\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/support.duolingo.com\/hc\/en-us\/articles\/13326738333069-What-is-Duolingo-Max\">What is Duolingo Max?<\/a>. \u591a\u90bb\u56fd.\u00a0[2024-07-13]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20240713074259\/https:\/\/support.duolingo.com\/hc\/en-us\/articles\/13326738333069-What-is-Duolingo-Max\">\u5b58\u6863<\/a>\u4e8e2024-07-13\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-27\">^<\/a><\/strong>\u00a0Simonite, Tom.\u00a0<a href=\"http:\/\/www.technologyreview.com\/news\/506656\/the-cleverest-business-model-in-online-education\/\">The Cleverest Business Model in Online Education<\/a>. Technologyreview.com. 2012-11-29\u00a0[2014-02-21]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20151127160721\/http:\/\/www.technologyreview.com\/news\/506656\/the-cleverest-business-model-in-online-education\/\">\u5b58\u6863<\/a>\u4e8e2015-11-27\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-28\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20140209111042\/http:\/\/blog.duolingo.com\/post\/64024962586\/duolingo-now-translating-buzzfeed-and-cnn\">Duolingo now translating BuzzFeed and CNN<\/a>. Duolingo. 2013-10-14\u00a0[2013-11-07]. \uff08<a href=\"http:\/\/blog.duolingo.com\/post\/64024962586\/Duolingo-now-translating-buzzfeed-and-cnn\">\u539f\u59cb\u5185\u5bb9<\/a>\u5b58\u6863\u4e8e2014-02-09\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-29\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/www.buzzfeed.com\/buzzfeedpress\/buzzfeed-expands-internationally-in-partnership-with-duoling\">BuzzFeed Expands Internationally In Partnership With Duolingo<\/a>. Buzz Feed. 2013-10-14\u00a0[2013-11-07]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20201124050307\/https:\/\/www.buzzfeed.com\/buzzfeedpress\/buzzfeed-expands-internationally-in-partnership-with-duoling\">\u5b58\u6863<\/a>\u4e8e2020-11-24\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-ReferenceA_30-0\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.duolingo.com\/courses\/zh\">\u591a\u90bb\u56fd &#8211; \u5b66\u4e60\u5916\u8bed\u7684\u6700\u4f73\u9014\u5f84<\/a>. \u591a\u90bb\u56fd.\u00a0[2020-01-13]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20210120224948\/https:\/\/www.duolingo.com\/courses\/zh\">\u5b58\u6863<\/a>\u4e8e2021-01-20\uff09.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-31\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.duolingo.com\/enroll\/de\/zh\/%E5%AD%B8%E7%BF%92-%E5%BE%B7%E8%AA%9E\">\u9762\u5411\u4e2d\u6587\u4f7f\u7528\u8005\u7684\u5fb7\u8a9e\u8ab2\u7a0b<\/a>. 2022-08-07\u00a0[2022-08-07]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20201025111119\/https:\/\/www.duolingo.com\/enroll\/de\/zh\/%E5%AD%B8%E7%BF%92-%E5%BE%B7%E8%AA%9E\">\u5b58\u6863<\/a>\u4e8e2020-10-25\uff09.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-32\">^<\/a><\/strong>\u00a0<a href=\"http:\/\/olimo.livejournal.com\/208893.html\">My Three Months of Duolingo<\/a>\u00a0\uff08<a href=\"https:\/\/web.archive.org\/web\/20181016005811\/http:\/\/olimo.livejournal.com\/208893.html\">\u9875\u9762\u5b58\u6863\u5907\u4efd<\/a>\uff0c\u5b58\u4e8e<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E4%BA%92%E8%81%94%E7%BD%91%E6%A1%A3%E6%A1%88%E9%A6%86\">\u4e92\u8054\u7f51\u6863\u6848\u9986<\/a>\uff09: &#8220;There are 2014 words listed in my Duolingo vocabulary&#8221;. (<a href=\"http:\/\/olimo.livejournal.com\/\">http:\/\/olimo.livejournal.com\/<\/a>\u00a0\uff08<a href=\"https:\/\/web.archive.org\/web\/20201021020509\/http:\/\/olimo.livejournal.com\/\">\u9875\u9762\u5b58\u6863\u5907\u4efd<\/a>\uff0c\u5b58\u4e8e<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E4%BA%92%E8%81%94%E7%BD%91%E6%A1%A3%E6%A1%88%E9%A6%86\">\u4e92\u8054\u7f51\u6863\u6848\u9986<\/a>\uff09, 2012-09-19)<strong>\uff08\u82f1\u8bed\uff09<\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-33\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20150108224320\/http:\/\/blog.duolingo.com\/post\/41960192602\/duolingos-data-driven-approach-to-education\">Duolingo&#8217;s Data-Driven Approach to Education<\/a>. Blog.Duolingo.com. 2013-01-31\u00a0[2014-02-21]. \uff08<a href=\"http:\/\/blog.duolingo.com\/post\/41960192602\/duolingos-data-driven-approach-to-education\">\u539f\u59cb\u5185\u5bb9<\/a>\u5b58\u6863\u4e8e2015-01-08\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-34\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20130123205309\/http:\/\/static.duolingo.com\/s3\/DuolingoReport_Final.pdf\">Duolingo Effectiveness Study<\/a>\u00a0(PDF). unpublished.\u00a0[2013-08-23]. \uff08<a href=\"http:\/\/static.duolingo.com\/s3\/DuolingoReport_Final.pdf\">\u539f\u59cb\u5185\u5bb9<\/a>\u00a0(PDF)\u5b58\u6863\u4e8e2013-01-23\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-35\">^<\/a><\/strong>\u00a0Kelleher, Kevin.\u00a0<a href=\"https:\/\/web.archive.org\/web\/20131028175626\/http:\/\/pandodaily.com\/2013\/05\/30\/say-what-duolingo-points-to-datas-important-role-in-online-education\/\">Say what? Duolingo points to data&#8217;s important role in online education<\/a>. Pandodaily.com. 2013-05-30\u00a0[2014-02-21]. \uff08<a href=\"http:\/\/pandodaily.com\/2013\/05\/30\/say-what-Duolingo-points-to-datas-important-role-in-online-education\/\">\u539f\u59cb\u5185\u5bb9<\/a>\u5b58\u6863\u4e8e2013-10-28\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-36\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/www.bbc.co.uk\/languages\/\">BBC Languages<\/a>. BBC.\u00a0[2013-08-23]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20210225123003\/http:\/\/www.bbc.co.uk\/languages\/\">\u5b58\u6863<\/a>\u4e8e2021-02-25\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-37\">^<\/a><\/strong>\u00a0<a href=\"https:\/\/web.archive.org\/web\/20151213110302\/http:\/\/www.goethe-verlag.com\/book2\/index.htm\">book2 &#8211; Learn languages online for free with 100 audio (mp3) files<\/a>. Goethe-Verlag.\u00a0[2013-08-23]. \uff08<a href=\"http:\/\/www.goethe-verlag.com\/book2\/index.htm\">\u539f\u59cb\u5185\u5bb9<\/a>\u5b58\u6863\u4e8e2015-12-13\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-38\">^<\/a><\/strong>\u00a0Osman, Mansur; Jackson, Shuttleworth.\u00a0<a href=\"https:\/\/blog.duolingo.com\/widget-feature\/\"><bdi>How we developed our addictive and delightful widget<\/bdi><\/a>. \u591a\u90bb\u56fd.\u00a0[2024-07-13]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20240504045720\/https:\/\/blog.duolingo.com\/widget-feature\/\">\u5b58\u6863<\/a>\u4e8e2024-05-04\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%A4%9A%E9%84%B0%E5%9C%8B#cite_ref-39\">^<\/a><\/strong>\u00a0Sammi, Siegel.\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=ejr7g6riodk\">Duolingo\u2019s Path to Math!<\/a>. Youtube. 2022-08-27\u00a0[2024-07-13]. \uff08\u539f\u59cb\u5185\u5bb9<a href=\"https:\/\/web.archive.org\/web\/20240713074258\/https:\/\/www.youtube.com\/watch?v=ejr7g6riodk\">\u5b58\u6863<\/a>\u4e8e2024-07-13\uff09\u00a0<strong>\uff08\u82f1\u8bed\uff09<\/strong>.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u5916\u90e8\u94fe\u63a5\">5. \u5916\u90e8\u94fe\u63a5 | External links<\/h2>\n\n\n\n<p><strong>\u591a\u90bb\u56fd<\/strong>\u5728\u7ef4\u57fa\u767e\u79d1\u7684<a href=\"https:\/\/zh.wikipedia.org\/wiki\/Wikipedia:%E7%BB%B4%E5%9F%BA%E5%AA%92%E4%BD%93%E5%A7%8A%E5%A6%B9%E9%A1%B9%E7%9B%AE\">\u59ca\u59b9\u9879\u76ee<\/a><\/p>\n\n\n\n<ul class=\"has-small-font-size wp-block-list\">\n<li><img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"27\" srcset=\"\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/4\/4a\/Commons-logo.svg\/30px-Commons-logo.svg.png 1.5x, \/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/4\/4a\/Commons-logo.svg\/40px-Commons-logo.svg.png 2x\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/4\/4a\/Commons-logo.svg\/20px-Commons-logo.svg.png\" alt=\"\">\u7ef4\u57fa\u5171\u4eab\u8d44\u6e90\u4e0a\u7684<a href=\"https:\/\/commons.wikimedia.org\/wiki\/Category:Duolingo\">\u591a\u5a92\u4f53\u8d44\u6e90<\/a><\/li>\n\n\n\n<li><img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"15\" srcset=\"\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/f\/ff\/Wikidata-logo.svg\/41px-Wikidata-logo.svg.png 1.5x, \/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/f\/ff\/Wikidata-logo.svg\/54px-Wikidata-logo.svg.png 2x\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/f\/ff\/Wikidata-logo.svg\/27px-Wikidata-logo.svg.png\" alt=\"\">\u7ef4\u57fa\u6570\u636e\u4e0a\u7684<a href=\"https:\/\/www.wikidata.org\/wiki\/Q2918660\">\u6570\u636e\u9879<\/a><\/li>\n<\/ul>\n\n\n\n<p>\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/p>\n\n\n\n<ul class=\"has-small-font-size wp-block-list\">\n<li><a href=\"https:\/\/zh-cn.duolingo.com\/\">\u5b98\u65b9\u7f51\u7ad9<\/a>\u00a0<a href=\"https:\/\/www.wikidata.org\/wiki\/Q2918660#P856\"><\/a><strong>\uff08\u82f1\u8bed\uff09<\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E5%BC%80%E6%94%BE%E5%BC%8F%E7%9B%AE%E5%BD%95\">\u5f00\u653e\u76ee\u5f55\u9879\u76ee<\/a>\u4e2d\u7684\u201c<a href=\"https:\/\/curlie.org\/Science\/Social_Sciences\/Linguistics\/Education\/Multi-Language\/Online_Lessons\/\">Online language learning<\/a>\u201d<strong>\uff08\u82f1\u8bed\uff09<\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/www.duolingo.com\/comment\/20425753\">An extract from a Q&amp;A with the founder of Duolingo about their plans for 2017<\/a><strong>\uff08\u82f1\u8bed\uff09<\/strong><\/li>\n\n\n\n<li><a href=\"http:\/\/blog.duolingo.com\/\">\u5b98\u65b9\u535a\u5ba2<\/a>\u00a0\uff08<a href=\"https:\/\/web.archive.org\/web\/20210303010650\/http:\/\/blog.duolingo.com\/\">\u9875\u9762\u5b58\u6863\u5907\u4efd<\/a>\uff0c\u5b58\u4e8e<a href=\"https:\/\/zh.wikipedia.org\/wiki\/%E4%BA%92%E8%81%94%E7%BD%91%E6%A1%A3%E6%A1%88%E9%A6%86\">\u4e92\u8054\u7f51\u6863\u6848\u9986<\/a>\uff09<strong>\uff08\u82f1\u6587\uff09<\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=WyzJ2Qq9Abs&amp;t=0h0m0s\">YouTube\u4e0a\u7684Duolingo Intro<\/a><strong>\uff08\u82f1\u8bed\uff09<\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=-Ht4qiDRZE8&amp;t=0h0m0s\">YouTube\u4e0a\u7684Luis von Ahn: Massive-scale online collaboration<\/a><strong>\uff08\u82f1\u8bed\uff09<\/strong>\uff0c2011\u5e7412\u67086\u65e5\u4e0a\u4f20\u4e8e TEDtalksDirector \u9891\u9053<\/li>\n\n\n\n<li><a href=\"https:\/\/twitter.com\/Duolingo\">\u591a\u90bb\u56fd\u7684X\uff08\u524dTwitter\uff09\u8d26\u6237<\/a><strong>\uff08\u82f1\u8bed\uff09<\/strong><\/li>\n\n\n\n<li><a href=\"https:\/\/www.facebook.com\/Duolingo\">\u591a\u90bb\u56fd\u7684Facebook\u4e13\u9875<\/a><strong>\uff08\u82f1\u8bed\uff09<\/strong><\/li>\n\n\n\n<li>Business data for Duolingo, Inc.:\u3010\u591a\u90bb\u56fd\u516c\u53f8\u7684\u4e1a\u52a1\u8d8b\u52bf\u3011\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.bloomberg.com\/quote\/DUOL:US\">Bloomberg<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.google.com\/finance\/quote\/DUOL:NASDAQ\">Google<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.reuters.com\/markets\/companies\/DUOL.N\">Reuters<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.sec.gov\/cgi-bin\/browse-edgar?action=getcompany&amp;CIK=1562088\">SEC filings<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/finance.yahoo.com\/quote\/DUOL\">Yahoo!<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e2d\u6587\u8bcd\u6761\u539f\u6587\u94fe\u63a5\uff08\u65e0\u6cd5\u4ece\u4e2d\u56fd\u5185\u5730\u8bbf\u95ee\uff09\uff1a\u8bf7\u70b9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[94,24,45,119,42],"tags":[155,101],"class_list":["post-3781","post","type-post","status-publish","format-standard","hentry","category-internet-industry","category-enterprise","category-usa-and-canada","category-education","category-languages","tag-155","tag-101"],"_links":{"self":[{"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/posts\/3781","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/comments?post=3781"}],"version-history":[{"count":0,"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/posts\/3781\/revisions"}],"wp:attachment":[{"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/media?parent=3781"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/categories?post=3781"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cathayvista.top\/index.php\/wp-json\/wp\/v2\/tags?post=3781"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}