FluentU transforms authentic videos into personalized language learning experiences. The platform allows learners to study with any Netflix or YouTube video that has subtitles in their target language, or choose from a curated library of thousands of learner-friendly videos organized by level and handpicked by language experts.

The platform features an interactive video player with clickable subtitles that provide instant word definitions, usage examples, and contextual explanations. Learners can slow down or loop videos to master pronunciation and can toggle between target language text, romanization, and English subtitles. Each word clicked opens detailed explanations created by language professionals, covering nuances like idioms, collocations, and separable verbs.

FluentU includes a powerful learning engine that builds vocabulary through context-based quizzes. The spaced repetition system presents sentence-based questions with images and video clips that help learners progress from understanding to active speaking. The platform provides beginner courses with original content and integrates seamlessly across web, iOS, and Android devices. Over 100,000 hours of expert work has gone into creating and maintaining the learning content. A Chrome extension enables learning directly on Netflix and YouTube pages.