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Duolingo ( D(Y)OO-oh-LING-goh) is an American platform that includes a language-learning website and mobile app, as well as a digital language-proficiency assessment exam. The company uses the freemium model; the app and the website are accessible without charge, although Duolingo also offers a premium service for a fee.

As of 30 June 2020, the language-learning website and app offered 95 different language courses in 38 languages. The app has over 300 million registered users across the world.