A browser sidebar that turns YouTube subtitles into saved vocabulary with spaced-repetition review.
LinkerTube adds a sidebar to YouTube that shows subtitles and translations while you watch, and lets you save unfamiliar words with a single click. Saved words go into a spaced-repetition review queue, and each one links back to the exact video moment where you found it for context. It's aimed at English learners who want to study from videos they'd watch anyway rather than a separate course. The core product is free with cloud sync; a Pro plan layers on an AI coaching feature and unlimited vocabulary for $9 a month, $79 a year, or a $199 one-time lifetime option discounted from $500.
Free tier covers subtitle lookup and word-saving with cloud sync; Pro adds an AI coach and removes the vocabulary limit.
Use tool ↗LinkerTube is a solid pick for someone who already watches a lot of English-language YouTube and wants to turn that into vocabulary practice without switching apps. The free tier covers the core loop of saving and reviewing words; the Pro coaching layer is a nice-to-have rather than essential.
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