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The round valued the company at around $470 million and Duolingo reported having over 100 million users globally.

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On 10 June 2015, Duolingo announced that it had raised $45 million from a Series D funding round led by Google Capital, bringing its total funding to $83.3 million. At this time, Duolingo had 34 employees and reported having about 25 million registered users and 12.5 million active users, though it later reported a figure nearer 60 million users. On 18 February 2014, Duolingo announced that it had raised $20 million from a Series C funding round led by Kleiner Caufield & Byers, with prior investors also participating. By July 2013, the service has grown to 5 million users and was rated the #1 free education app in the Google Play store.

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This was followed by the release of an Android app on, at which time Duolingo had a user base of around 3 million. On 13 November 2012, Duolingo released their iOS app through the iTunes App Store as a free download for the Apple iPhone. On 17 September 2012, Duolingo announced that it had raised a further $15 million from a Series B funding round led by New Enterprise Associates, with participation from Union Square Ventures. The platform launched to the general public on 19 June 2012, at which point the waiting list had grown to around 500,000.

Duolingo launched its private beta on 30 November 2011, and accumulated a waiting list of more than 300,000 people. On 19 October 2011, Duolingo announced that it had raised $3.3 million from a Series A first-round of funding, led by Union Square Ventures, with participation from author Tim Ferriss and actor Ashton Kutcher's investing firm A-Grade Investments.

The founders considered creating Duolingo as a nonprofit organization but Von Ahn judged this model as unsustainable. The project was originally sponsored by Luis von Ahn's MacArthur fellowship and a National Science Foundation grant. Swiss-born Hacker (co-founder and current CTO of Duolingo) believed that 'free education will really change the world' and wanted to supply people an outlet to do so.Дuolingo originally achieved this by teaching its users a foreign language to a point where they could begin translating complex sentences and then would charge companies for these translation services, though this approach was later removed. A driving motivation was Von Ahn's upbringing in Guatemala, where he saw how expensive it was for people in his community to learn English.

Von Ahn had sold his second company, reCAPTCHA, to Google and, with Hacker, wanted to work on something related to education. The idea for Duolingo was initiated at the end of 2009 in Pittsburgh by Carnegie Mellon University professor Luis von Ahn and his post-graduate student Severin Hacker. Duolingo has over 500 million registered users. The company uses a freemium model: the app and the website are accessible without charge, although Duolingo also offers a premium service for a fee.ДЄs of June 2021, Duolingo offers 103 different language courses in 40 languages. Kotlin, Swift, React, Python, Scala, HTML, CSS, JavaScriptДuolingo ( / ЛЊ dj uЛђ oКЉ Л€ l ЙЄ Е‹ ЙЎ oКЉ/ DEW-oh- LING-goh) is an American language-learning website and mobile app, as well as a digital language proficiency assessment exam.

#Autodesk inventor tutorial book 2019 windows 10

Language courses, Duolingo English Test, Duolingo for Schools, Tinycards flashcard appДЈ0В November 2011 10 years ago ( ) (private beta)ДЎ9В June 2012 9 years ago ( ) (public release)ДЄndroid, iOS, Windows Phone, Windows 10 Mobile, Web Browser

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Online education, Professional certification, Translation, Crowdsourcing

Yucatec Maya (in future, in Spanish only).

Thai (Interface language for learning English only).

Chinese (Mainland Chinese, Standard Mandarin, Simplified Characters).