Learn a language for free
Duolingo is the world's most-downloaded language learning app, offering free courses in 40+ languages using gamification, adaptive learning, and AI-powered personalization through its Birdbrain ML system. The company generates revenue through its Duolingo Plus subscription, the Duolingo English Test (an online certification accepted by 5,000+ institutions), and advertising on its free tier. Duolingo went public on Nasdaq in 2021 and serves over 500 million registered users.
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