Duolingo

Duolingo is an American educational technology company that specializes in language-learning apps and courses. Founded in 2011 by Luis von Ahn and Severin Hacker, the company is headquartered in Pittsburgh, Pennsylvania. Duolingo offers courses in 42 languages, as well as subjects like music, math, and chess. Its mission is to provide high-quality education that is accessible to everyone. As the world's most popular language-learning app, Duolingo boasts over 116 million monthly active users and 9.5 million paying subscribers. The flagship app features gamified lessons and interactive tools, including Duolingo ABC for children's literacy, the Duolingo English Test for language certification, and additional resources like flashcards and podcasts. The company also supports educators through Duolingo for Schools, which integrates its platform into classroom settings. Duolingo is publicly traded on NASDAQ under the ticker DUOL and employs around 850–900 people across multiple global offices.