Duolingo

Duolingo is a free language learning platform that uses gamification and bite-sized lessons to teach reading, writing, listening, and speaking skills across 40+ languages. The app combines research-backed teaching methods with game-like features, earning points and unlocking levels to keep users motivated. It's designed for anyone wanting to learn a language at their own pace, with personalized lessons that adapt to individual learning levels. The platform distinguishes itself through science-backed efficacy—an independent study showed 34 hours of Duolingo study equivalent to a semester of university language instruction. It offers courses in common languages like Spanish and French, as well as less commonly studied languages such as Hawaiian, Māori, Navajo, and constructed languages like Esperanto and Klingon. One limitation is that while effective for building foundational skills, reviews suggest it may not be comprehensive enough for advanced grammar mastery without supplementary resources.