Duolingo is the world's most popular language learning app, with over 130 million monthly active users. The core product is a free, gamified mobile app that teaches languages through short, AI-personalized lessons covering reading, writing, listening, and speaking. Duolingo offers over 250 language courses, with English, Spanish, French, German, and Japanese among the most popular. Beyond languages, Duolingo has expanded into Math, Music, and Chess within the same app. Duolingo also operates the Duolingo English Test, an online English proficiency exam accepted by over 6,100 institutions globally, competing against TOEFL and IELTS on price and convenience. Duolingo runs a freemium model: all learning content is free, and Duolingo charges for subscriptions that remove ads and unlock features. The core paid tier is Super Duolingo; a premium tier, Duolingo Max, adds AI-powered features like conversational speaking practice and is priced roughly 2x Super. Subscriptions account for over 90% of revenue, with advertising and Duolingo English Test fees rounding out the revenue mix. Duolingo acquires most users through word-of-mouth rather than paid marketing. In 2026, management deliberately shifted to prioritizing DAU growth over near-term monetization — reducing friction in the free experience — with a goal of reaching 100 million DAUs by 2028, up from ~53 million at end of FY25.