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https://www.duolingo.com/

Duolingo (/ˌduːoʊˈlɪŋɡoʊ/ DEW-oh-LING-goh) is a freemium language-learning platform that includes a language-learning website and app, as well as a digital language proficiency assessment exam. As of August 2018, the language-learning website and app offer 81 different language courses across 37 languages. The app has about 300 million registered users across the world.^[

https://en.wikipedia.org/wiki/Duolingo