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, Japanese, French and German.
It's free, takes one click, and works on the YouTube videos you already watch. No account needed to try it.
Chrome extensions don't exist on phones or tablets — LingoKeep needs a desktop browser to sit alongside YouTube.
Review still works here: your cards are on the web, and /review installs as an app.
- target languages
- 4target languages
- dictionary entries
- 540k+dictionary entries
- cards on the free plan
- 100cards on the free plan
- spaced repetition, forever
- $0spaced repetition, forever
How it works
Watch something you'd have watched anyway
Four steps, and the only new habit is the last one.
Step 1
Watch
Open a YouTube video in Spanish, Japanese, French or German. The subtitles and their translation appear together under the player, with the replay and slow-down controls a learner needs.
Step 2
Understand
Click a word — or drag across a phrase — and the video pauses on its dictionary entry: dictionary form, reading, part of speech, meanings.
Step 3
Choose
Not sure what's worth learning? Ask the video. The word list ranks everything new in it by how common the word is, and tells you how much of the video that covers.
Step 4
Remember
Saved words come back as flashcards that replay the original clip, scheduled by FSRS to reach you just before you'd forget. Each grade shows the interval it will actually give you.
Features
Built for the boring part
Looking a word up is easy. Meeting it again three days later is the part that needs software.
Dual Subtitles
The original subtitles and an English translation, together, under the player. The target line is set in a reading serif and every word in it is clickable; the translation sits under it in the same face's italic, the way a dictionary sets a gloss.
Instant Dictionary
Click any word and the video pauses on a dictionary card: the dictionary form, the reading where a language has one, the part of speech in plain English, and the meanings — without leaving the video.
The Word List
Ask a video what it wants you to know. LingoKeep reads the whole transcript, folds every form onto its dictionary word, drops the ones you already have cards for, and shows you what's left in frequency order — with how much of the new vocabulary you'd cover by learning it.
Free Spaced-Repetition Review
Review runs on FSRS, the same modern scheduler serious Anki users switch to, and it is free forever. A card opens by replaying its clip — you hear the sentence before you see it — then grades on Again / Hard / Good / Easy.
Your Deck, on the Web
Every card you've saved, as a grid you can actually navigate — with a strip across the top that shows what state your deck is in: how much is new, learning, young and mature, the last 90 days of reviews, and what's coming for the next seven.
Works Before You Sign Up
The extension needs no account to be useful. Subtitles, the dictionary, the word list and saving cards all work signed out, stored on your own machine — and so do browsing your deck and doing a review session.
Languages
Four languages, done properly
Each one ships a real dictionary with the inflected forms mapped back to their dictionary word — so a conjugated verb in a subtitle finds its entry. Japanese is segmented and carries readings, because a sentence with no spaces can't be clicked without it.
- Spanish
- Japanese
- French
- German
Pricing
Free forever. Pro when your deck outgrows it.
Review is the part that makes this work, so it isn't the part we charge for.
Free
$0forever
- Dual subtitles and the click-any-word dictionary
- The per-video word list and searchable transcript
- Spaced-repetition review, on desktop and phone
- Sync across devices — up to 100 cards
Pro
Save 35% yearly$4.99/month, or $39 a year
- Unlimited cards
- Anki export — CSV, or one click into Anki
- Priority support
Cancel anytime — nothing you saved is deleted.
From the blog
Latest guides
- The Best Anki Alternative for Language Learning Depends on Which Part of Anki You Want GoneWhich Anki alternative fits depends on the part of Anki you want to drop: making cards by hand, the settings and add-ons, or the desktop-first interface — and if all you wanted was a better scheduler, Anki has had FSRS built in since version 23.10. Here's a table of replacements by type, with each example checked against its own site in October 2026, when staying with Anki is the better call, and how to keep Anki while getting rid of the card-making.
- Is Language Reactor Free? What the Free Plan Does, What Pro Costs, and the Free AlternativesMostly, yes: Language Reactor's bilingual subtitles, click-a-word dictionary and playback tools are free on YouTube, and free on Netflix with Netflix's own subtitles. Pro — US$5.95 a month, US$13.95 for three months or US$39.95 a year — is what lets you save words while you watch, highlights them everywhere and exports them to Anki. Here is the Free-vs-Pro line read off Language Reactor's own Pro page in October 2026, and the free alternatives sorted by what you actually need.
- A Japanese Immersion Roadmap: How Many Hours Japanese Takes, and the Six Stages in BetweenJapanese takes an English speaker thousands of hours: the US Foreign Service Institute budgets 88 weeks (2,200 class hours) for it, and Refold's immersion estimate for a language that distant is about 2,700 hours of total effort to functional fluency, double its figure for Spanish. Here's what each of those numbers measures, a six-stage roadmap from kana to speaking with rough hours for every stage, the parts only Japanese has (kana, kanji, reading), and the one thing hour-counting doesn't buy you.
- How to Make Flashcards from YouTube Videos for Language Learning: By Hand, With a Toolchain, or in One ClickMaking flashcards from a YouTube video comes down to four steps: get the video's subtitles in the language you're learning, pick the words or sentences worth keeping, save each one with its original sentence and a timestamp back to that moment, and review them on a spaced-repetition schedule. Here are the three ways to do it — by hand into Anki, with the free asbplayer + Yomitan toolchain, or in one click with LingoKeep — what makes a card worth keeping, and the limits of each.
Get LingoKeep
Add LingoKeep to your browser
It's free, takes one click, and works on the YouTube videos you already watch. No account needed to try it.
Install it on a computer
Chrome extensions don't exist on phones or tablets — LingoKeep needs a desktop browser to sit alongside YouTube.
Review still works here: your cards are on the web, and /review installs as an app.