Duolingo

Duolingo, Inc. is an American educational technology company founded in 2011 in Pittsburgh, Pennsylvania, by Luis von Ahn and Severin Hacker. The company is dedicated to providing free, gamified language learning and has expanded into subjects like math, literacy, music, and chess. Duolingo operates on a freemium model, offering core features for free while monetizing through ads and premium subscriptions, known as Super Duolingo. The platform offers courses in over 42 languages, utilizing gamification to create engaging and interactive lessons. Duolingo also provides the Duolingo English Test (DET), an affordable certification option. The company emphasizes accessibility through its web and mobile apps, encouraging daily learning habits with features like points, rewards, and characters such as Duo the owl. With over 100 million monthly users across more than 100 countries, Duolingo is recognized as the world's most popular language-learning app.