Duolingo operates a freemium learning platform spanning languages, math, music, chess, and English proficiency testing.
Luis von Ahn (ex-CMU AI head) combines technical depth with business clarity; AI enables 20x faster product development (chess built in 9 months by 6 people vs 4-6x people/4x time historically), driving new revenue streams while core language app compounds. Discount rate rose in 2022 but opportunity set expanded equally.