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Watch German content, click any word for instant translation, save vocabulary automatically, and review with spaced repetition — all without leaving the same tab.
Butterfluent generates subtitles from YouTube links and uploaded video or audio files, even when the source has no captions.
The player shows German and English together so learners can understand scenes while still focusing on real German input.
Learners can click subtitle words to understand vocabulary and grammar in context instead of switching to a separate dictionary.
Butterfluent's Chrome extension adds dual subtitles, click-to-lookup words, phrase selection, saved vocabulary, and study controls directly inside YouTube and supported streaming players.
Butterfluent includes a subtitle search tool for movies and series, so learners can quickly find files and open them directly inside the app.
The app turns saved vocabulary and subtitle moments into reusable flashcards and review sessions.
Butterfluent tracks learning progress so users can see how much vocabulary and watch time they have completed.
The player is designed for study, not just viewing, with controls that support careful listening and reading practice.
Butterfluent includes a free plan today and describes upcoming Pro and Team capabilities for heavier learners and organizations.