Duolingo is a website and social project aimed at free language learning and certification of English level.
The site offers courses in English, French, German, Portuguese, Italian, Catalan, Esperanto and Jopará for Spanish-speaking users in addition to Dutch, Danish, Swedish, Norwegian, Turkish, Esperanto, Russian, Hebrew, Irish, Ukrainian among others.2 , new courses are being created thanks to «The language incubator» .
In addition to its desktop web version, it has an application for iOS, Android, Windows Phone and Chrome.
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