Duolingo has turned the gamification of education into a model for success, winning over 200 million users—an impressive number for a learning app, as investors appear to recognize: The company was valued at $700 million in July 2017. In 2017, it grew its base 30%, to 25 million monthly users, who can take 75 free courses in 29 languages. The company first solidified its market lead with a flashcards app called Tinycards. Duolingo’s first foray outside of languages, Tinycards uses a mix of repetition, animation, and positive affirmation as a means of teaching users virtually anything from human anatomy to Pokémon names and statistics. And because users can make their own shareable decks on any topic of their choosing, Tinycards taps into another urge to compete—and show off trivia knowledge—between friends, making it the perfect education platform for swipe-left millennials.