LingoKeep — Watch. Understand. Keep.
Learn Languages Watching YouTube — and Actually Remember
LingoKeep adds dual subtitles, a click-any-word dictionary, and one-click flashcards to YouTube. Every word you save comes back in free spaced-repetition review — in the extension or on your phone. Spanish and Japanese first.
The extension is in development — Spanish and Japanese first, UI in English.
How it works
Watch
Open any YouTube video in your target language. LingoKeep shows the original subtitles and an English translation together, with sentence-level replay and slow-down controls.
Understand
Click any word — or select a whole phrase — to see its dictionary form, reading, and meanings in a popup, without leaving the video.
Save
One click turns the word into a flashcard that keeps its sentence, translation, and a link to the exact second of the video.
Remember
Free FSRS spaced-repetition review brings each card back right before you'd forget it — in the extension, or on your phone at lingokeep.com/review.
A real loop from watching to remembering
Dual Subtitles
Original and English translation side by side on the YouTube player, with replay-this-line and slow-down controls built for learners.
Instant Dictionary
Click any word for its dictionary form, reading, and meanings — and select multiple words to look up a whole phrase.
One-Click Flashcards
Save a word or phrase with its sentence and a timestamp back to the exact second of the video it came from.
Free FSRS Review
Modern spaced repetition, free forever — review in the extension or on your phone as an installable web app.
Anki Export
Pro users can export their whole deck as CSV for Anki — your cards are never locked in.
Privacy-First
Runs only on youtube.com and lingokeep.com. No watch-history tracking — only the cards you explicitly save are stored.
Free forever. Pro when your deck outgrows it.
Dual subtitles, the dictionary, FSRS review, and sync are free with a 100-card deck. Pro removes the cap and adds Anki export.
Free
The full learning loop, free forever — up to 100 cards
Free forever
- Dual Subtitles
- Instant Dictionary
- Phrase Selection
- One-Click Flashcards
- Free Spaced-Repetition Review
- Review on Your Phone
- Privacy-First, Minimal Permissions
- 100-card deck
Pro Monthly
Unlimited cards and Anki export for serious learners
$4.99/month
- Everything in Free
- Anki Export
- Unlimited Cards
- AI Explanations (coming later)
- Priority support
Pro Yearly
Unlimited cards and Anki export for serious learners
$39/yearSave 35%
- Everything in Free
- Anki Export
- Unlimited Cards
- AI Explanations (coming later)
- Priority support
Frequently asked questions
- Which languages does LingoKeep support?
- Spanish and Japanese at launch, with the interface in English. We'd rather do two languages properly — dictionaries, phrase lookup, readings — than twenty badly. More languages will follow based on demand.
- Is spaced-repetition review really free?
- Yes, permanently. FSRS review, dual subtitles, the dictionary, and sync are all part of the free plan. Review is the core of the learning loop, so putting it behind a paywall would defeat the point of the product.
- Why does the free plan cap the deck at 100 cards?
- Storing and syncing cards costs us money, and 100 cards is enough to build a real review habit and see whether LingoKeep works for you. If you're saving more than that, you're getting real value from it — that's what Pro ($4.99/mo or $39/yr) is for.
- Does it work with auto-generated subtitles?
- Yes. LingoKeep works with regular and auto-generated YouTube subtitle tracks. Auto-generated subtitles are less accurate than human-made ones — especially for fast or noisy speech — so dictionary lookups on them can occasionally miss.
- Does it work on Netflix?
- Not yet. We're focused on doing YouTube really well first — it's free, has endless content in every language, and lets us link every flashcard back to the exact second of the video. Netflix support is on the radar for later.
- Can I export my cards to Anki?
- Yes — Anki export (CSV, with AnkiConnect support planned) is a Pro perk. The export includes the word, sentence, translation, glosses, and a link back to the video moment, so your deck is never locked in.
- What data does LingoKeep collect?
- Your account email and the cards you explicitly save — that's it. We don't track your browsing or watch history. The extension's permissions are limited to youtube.com and lingokeep.com, and you can delete your cards or your account anytime.
- What's your refund policy?
- If Pro isn't working out, email us within 14 days of a charge and we'll refund it, no questions asked. You can also cancel anytime from your account page and keep Pro until the end of the paid period.