Duolingo

Duolingo is an American educational technology company which produces learning apps and provides language certification. The platform was founded in 2011 by Luis von Ahn and Severin Hacker and has since grown to become one of the most popular language learning apps in the world.

https://www.duolingo.com/

Learn a new language with the world’s most-downloaded education app! Duolingo is the fun, free app for learning 40+ languages through quick, bite-sized lessons. Practice speaking, reading, listening, and writing to build your vocabulary and grammar skills.

Designed by language experts and loved by hundreds of millions of learners worldwide, Duolingo helps you prepare for real conversations in Spanish, French, Chinese, Italian, German, English, and more.

https://play.google.com/store/apps/details?id=com.duolingo&hl=en&gl=US