Dual subtitles inside the player
Keep a translated support line visible while following the original subtitle timing on supported streaming pages.
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Use Butterfluent directly inside YouTube, Netflix, and supported streaming platforms with dual subtitles, clickable word lookup, saved vocabulary, phrase analysis, and replay-friendly study controls.
Butterfluent works with subtitle tracks in many languages, while the deepest learning workflow is currently optimized for German learners.
Keep a translated support line visible while following the original subtitle timing on supported streaming pages.
Click subtitle words for fast in-context help, phrase support, and saved vocabulary without leaving the video.
Step backward, replay the active subtitle, loop tough lines, and turn passive watching into deliberate practice.
Adjust subtitle layout, keyboard shortcuts, background opacity, and player behavior from an in-player control surface.
Many learners want Language Reactor-style convenience without being trapped in a cluttered overlay or a Netflix-and-YouTube-only workflow. Butterfluent's extension keeps subtitles readable, moves settings into a dedicated player modal, and turns the active subtitle line into an interactive study surface across multiple supported streaming platforms. Butterfluent works with subtitle tracks in many languages, while the deepest learning workflow is currently optimized for German learners.
It adds dual subtitles, clickable word lookup, phrase selection, saved vocabulary, replay controls, loop mode, and study-focused playback tools directly inside supported video players.
No. Butterfluent supports YouTube, Netflix, Disney+, Prime Video, Hulu, Max, and Crunchyroll, with the strongest custom handling on YouTube and Netflix.
Butterfluent works with subtitle tracks in many languages, while the deepest learning workflow is currently optimized for German learners.
Butterfluent focuses on a cleaner in-player learning workflow, stronger German study tools, phrase-level help, saved vocabulary, and support beyond a single streaming pair.
Yes. Signed-in users can save words, keep review progress in sync, and come back later for spaced-repetition study sessions.