#7
Duolingo
100M+ monthly users. 40+ languages. Green owl is passive-aggressive. $6.5B IPO.
Duolingo is the most downloaded education app globally, with 100+ million monthly active users learning 40+ languages through gamified lessons. Its free tier includes all languages with ads, and studies show it matches university courses in reading and listening comprehension. While MIT OpenCourseWare offers deep academic content, Duolingo's streak notifications and leaderboards exploit addictive psychology to keep you learning Spanish. It went public in 2021 with a $6.5 billion valuation, proving its cultural and educational impact.
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