Duolingo is the world's largest online language learning platform and the most downloaded education app in the world for both Android and iOS devices. It was recognized as Apple's iPhone App of the Year in 2013 as well as Google Play's Best of the Best in 2013 and 2014. Duolingo has over 200 million users, is completely science- and data-based, and has gamified elements that make learning more fun.
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