Duolingo

Duolingo is the world's most popular language learning platform, founded in 2011 by Luis von Ahn (inventor of CAPTCHA and reCAPTCHA) and Severin Hacker. The publicly traded company serves over 100 million monthly active users and 52.7 million daily active users across 40+ language courses.

Duolingo has been one of the most aggressive adopters of generative AI in education. The company's Birdbrain AI engine powers personalized lesson generation, adapting difficulty and content to each learner's performance. Duolingo Max features include AI-powered roleplay conversations, explain-my-answer functionality, and AI-generated video call practice. The platform uses AI for speech recognition, pronunciation scoring, and real-time translation feedback.

In early 2025, Duolingo announced it would replace many contract content creators with AI — one of the most explicit "AI replacing human jobs" announcements from a major public company. This decision sparked significant debate about AI's impact on creative work, even as it demonstrated the practical reality of AI-driven content creation at scale. Duolingo's approach represents a leading example of how consumer-facing companies are fundamentally restructuring their operations around AI capabilities.