Duolingo

Duolingo is the world's most popular language learning app with over 500 million users. The platform uses AI to personalize each learner's experience, adapting difficulty and content based on individual progress and learning patterns. Features include Duolingo Max with GPT-4 powered conversations and explanations, video call practice with AI characters, and personalized review sessions. The gamified approach with streaks, leagues, and rewards keeps learners engaged. Duolingo offers courses in 40+ languages with content created by linguists and refined by AI optimization.