Table of Contents
Features
Watch and Understand
Dual Subtitles
See the original subtitles and an English translation at the same time, right on the YouTube player. Works with regular and auto-generated subtitle tracks.
- Original + translation shown together, styled to stay readable
- Sentence-level playback: replay the current line, jump back one line, slow it down
- Works on any YouTube video that has subtitles in your target language
Instant Dictionary
Click any word in the subtitles to see its dictionary form, reading, and meanings without leaving the video.
- Click a word — the video pauses and a compact dictionary popup opens
- Spanish and Japanese dictionaries with lemma and reading lookup
- Frequency hints so you know whether a word is worth learning
Phrase Selection
Languages are made of phrases, not just words. Select multiple words to look up and save an expression as one card.
- Drag across the subtitle line to select a multi-word phrase
- The whole sentence and the video timestamp come along automatically
Save and Remember
One-Click Flashcards
Save a word or phrase to your deck in one click. Every card keeps the sentence it came from and a link back to the exact second of the video.
- Card = word + sentence + translation + glosses + video timestamp
- Cards sync to your account so they follow you across devices
Free Spaced-Repetition Review
Review your cards with FSRS, the modern spaced-repetition scheduler — free, forever. Listening-first cards replay the original clip before showing you the sentence.
- FSRS scheduling: Again / Hard / Good / Easy, like Anki
- Listening cards replay the exact video clip as the card front
- Review is a free feature, not a paywall
Review on Your Phone
The review queue also lives at lingokeep.com/review — an installable web app, so dead minutes on the bus become review time.
- Same queue and scheduling as the extension
- Add it to your home screen like a native app
Anki ExportPRO
Your cards are yours. Pro users can export the whole deck to CSV for Anki import, with sentence, glosses, and video link included.
- CSV columns map cleanly onto Anki note fields
- Each card links back to the exact moment in the video
Unlimited CardsPRO
The free plan includes a 100-card deck — plenty to build a review habit. Pro removes the cap entirely.
- Free: up to 100 cards, all features included
- Pro: no limit
AI Explanations (coming later)PRO
Grammar and nuance explanations for the sentence you're looking at. Planned as a Pro perk — not available yet, and priced honestly as such.
- Not live yet — listed so you know where Pro is going
Privacy
Privacy-First, Minimal Permissions
The extension runs only on youtube.com and lingokeep.com, and we never track what you watch. The only thing stored on our servers is the cards you explicitly save.
- No browsing-history or watch-history collection
- Permissions limited to youtube.com and lingokeep.com
- Delete your cards or your whole account anytime