Duolingo
Duolingo, Inc.
The world's most popular language app, now AI-first with Video Call practice and AI-built courses.
The gamified language-learning platform that has rebuilt itself around AI: its proprietary Birdbrain model personalizes exercise difficulty, generative AI authored the 148 new courses launched in a single day in 2025, and paid subscribers practice speaking through Video Call with Lily, an AI character that remembers prior conversations. Core learning stays free with ads; Super and Max subscriptions unlock the advanced AI features.
Worth knowing
Declared itself 'AI-first' in April 2025, then launched 148 AI-built courses at once — its first 100 took about 12 years.
- language-learning
- tutor
- gamification
- speaking-practice