FullContext Vocabulary

Click any word in YouTube captions to save it. Color-coded spaced repetition built right into the video player.

FullContext Vocabulary turns YouTube into a language learning classroom. Click any word in the subtitles and it's instantly saved to your personal vocabulary bank. Words are color-coded so you always know where you stand: 🟢 Green — Known 🟡 Yellow — Due for review 🟠 Orange — Still learning 🟤 Brown — Imported, not yet reviewed FEATURES ───────────────────────────── • Click-to-save: tap any caption word to add it to your bank • Auto-translation: words are translated on first click • Spaced repetition: built-in review system (Know? / Due / Reinforce) • Full vocabulary panel: sort, filter, and manage all your words • Multi-language support: English, Spanish, French, German, Italian, Japanese, Korean, Chinese, Russian, Arabic • Word bases: import curated vocabulary sets from our store • Export & import: back up your word bank as JSON • 100% local storage: your words stay on your device HOW IT WORKS ───────────────────────────── 1. Enable subtitles on any YouTube video 2. Click any word you don't know — it turns orange and is saved 3. Click again once you know it — it turns green 4. Use the Review panel to practice with flashcards 5. Yellow words remind you to review before you forget PRIVACY ───────────────────────────── All vocabulary data is stored locally on your device using Chrome's built-in storage. No personal data is sent to any server. Full privacy policy: fullcontextvocabulary.web.app/privacy