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Duolingo is a free language-learning platform that includes a language-learning website and app along with a crowdsourced text translation platform and a language proficiency assessment center. Duolingo is ad-free and offers all its language courses free of charge. The language-learning website and app offer over 40 different language courses across 23 languages. The app is available on iOS, Android and Windows 8 and 10 platforms with over 100 million registered users across the world.〔(【引用サイトリンク】 work = Venture beat )〕 ==History== The project was started in Pittsburgh by Carnegie Mellon University professor Luis von Ahn (creator of reCAPTCHA) and his graduate student Severin Hacker, and then developed along with Antonio Navas, Vicki Cheung, Marcel Uekermann, Brendan Meeder, Hector Villafuerte, and Jose Fuentes.〔(【引用サイトリンク】 publisher= Twitpic )〕 Inspiration for Duolingo comes from two places. Luis Von Ahn wanted to create another program that served two purposes in one, what he calls a “twofer”. Duolingo does this by teaching its users a foreign language while having them translate simple phrases in documents. Forbes staff member, Parmy Olson revealed the other incentive towards creating Duolingo. Von Ahn was born in Guatemala and saw how expensive it was for people in his community to learn English. Severin (Bavarian) Hacker, co-founder of Duolingo, and Von Ahn believe that “free education will really change the world” and wanted to supply the people an outlet to do so. The project was originally sponsored by Luis von Ahn's MacArthur fellowship and a National Science Foundation grant.〔(【引用サイトリンク】publisher=National Science Foundation )〕〔(【引用サイトリンク】publisher=NewScientist )〕 Additional funding was later received in the form of investments from Union Square Ventures and actor Ashton Kutcher's firm, A-Grade Investments.〔〔 Duolingo started its private beta on 30 November 2011 and accumulated a waiting list of more than 300,000 users. On 19 June 2012, Duolingo launched for the general public. Due to popular interest, Duolingo has received many investments including $20 million Series C round of investment led by Kleiner Caufield & Byers.〔(【引用サイトリンク】publisher= Duolingo )〕 Duolingo has 42 staff members, of whom many were Google employees, and operates from an office in the Pittsburgh neighborhood of Shadyside near Carnegie Mellon's campus.〔 On 13 November 2012 Duolingo released their iOS app through the iTunes App Store. The application is a free download and is compatible with most iPhone, iPod and iPad devices. On 29 May 2013, Duolingo released their Android app, which was downloaded over a million times in the first three weeks and quickly became the #1 education app in the Google Play store. Duolingo then released both a Google Glass App (glassware) and support for Android Wear. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Duolingo」の詳細全文を読む スポンサード リンク
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