Duolingo
Free language learning for 500M+ people, from the inventor of CAPTCHA.
▶ Founder shortScalingAI & creator toolsAIConsumerProductivityUSA
Luis von Ahn grew up in Guatemala, where a good education cost money. He invented CAPTCHA, sold reCAPTCHA to Google and could have retired. Instead he and Severin Hacker built Duolingo to make language learning free — the gamified app, the owl, the streaks — and it now serves more than 500 million learners and is a public company. Its 2025 'AI-first' memo, and the backlash to it, made it the loudest case study on how AI reshapes a product team.
Why it's indexed
- 500M+ learners; a public company built on a free product.
- Founded by the inventor of CAPTCHA and reCAPTCHA.
- Its 2025 AI-first memo became the reference debate on AI in product teams.
Coverage
Founder short: Luis von Ahn & DuolingoFounder short
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