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SubTube
language in every video
Real-time captions, tap-to-define dictionary, and shadowing practice layered over any YouTube video. Learn with what you already love.
Still being built. We'll tell you the moment it's out.
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YouTube is already the largest living textbook on earth. SubTube gently layers your native language, your target language, and a word-level dictionary over the videos you already watch.
Tap a word to see its meaning, hold to save it for review. Shadowing, read-aloud, and repeat practice all run on your normal video — no separate curriculum, no streak pressure.