A whole loop, from watching to remembering

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.

• Works with both regular and auto-generated YouTube subtitle tracks
• Four text sizes, and the translation line can be always-on, hover-to-peek, or off
• Both lines reserve their height, so the page never jumps as a line wraps

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.

• Shows the word in the sentence you met it in, so the sense you need is obvious
• Tells you how many cards you already have for that word
• Speaks the word, with a voice picker and an optional auto-speak
• Part of speech reads "noun" or "verb", never a dictionary tag like v5u

Languages are made of phrases, not just words. Drag across the subtitle line to select an expression: you get a translation of the whole thing plus a gloss for each word in it, and you can save it as one card.

• One lookup for the whole selection — the phrase translation is the point, so it isn't hidden behind a button
• A per-word gloss list underneath, for when the phrase is only hard in one place
• The sentence and the video timestamp come along automatically

Listening to a sentence once is not studying it. The controls are the ones a learner actually reaches for, and each has a single-key shortcut.

• Jump a sentence back or forward, or replay the one you're on
• Loop a single sentence, or set an A→B range and loop that
• Auto-pause at the end of every sentence
• Slow down or speed up from 0.25× to 2×
• A master switch hands the keys back to YouTube if you'd rather it didn't take them

The translation comes from the best source available, and you can override it. The creator's own English track is preferred where one exists, then YouTube's translation, then your browser's on-device translator, then ours.

• Pick the source yourself: Auto, the creator's captions, your browser, or AI
• The first three sources work signed out; the AI one comes with a free account — with a daily allowance, and a far larger one on Pro
• A forced source never silently falls back — it says so instead
• Warns you when the audio isn't in the language you're studying, because a Spanish-subtitled English video teaches words nobody said

Study mode for a site built to distract you. One click hides recommendations, comments, end cards and the rest of the page furniture, and keeps the video and the title. A second layout moves the panel beside the video so you get the player and the full transcript on one screen.

• Page customization, not an ad blocker — it deliberately refuses to touch ads
• Falls back to the normal layout automatically when the window is too narrow
• Everything comes back the moment you switch it off

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.

• Tick a level and it assumes the most common 500, 2,000 or 5,000 words are already yours
• That's a frequency assumption, not a claim to know what you know — so it always shows its work: how many words the video has, how many it dropped, and why
• Tells you what the batch costs: "≈ 4 days at 10 new/day"
• Save the lot in one click, and it stops politely at your card limit instead of failing

The whole transcript, in a drawer. Click any line to jump there, save any line as a card from where it sits, or search the video for a word.

• Search ignores accents and matches word stems — type "matematic" and it finds "matemáticas"
• Filters the transcript down to the lines that match, rather than blinking one highlight at a time
• Enter and Shift+Enter walk the matches; Esc clears

One click saves the word with everything around it: the sentence it appeared in, that sentence's translation, the dictionary meanings, and a link back to the exact second of the video.

• Every save can be undone from the toast that confirms it
• Saving the same word from the same moment twice is recognised, not duplicated — on this device and across your others
• No typing, ever: a card's content is fetched, not written

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.

• Each grade shows the interval it will actually give you before you press it
• A daily limit on new cards, so a big mining session doesn't wreck next week
• Undo the last grade, including an Easy pressed by mistake
• Cards with no playable audio fall back to reading or cloze, so a session always works

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.

• Search it, or narrow by word vs sentence, by source video, or by maturity
• Click a day in the forecast to see exactly what's due then
• Find the cards you keep forgetting, called out on their own
• Select a run of cards — including by dragging a box over them — to delete them, mark them as already known, or reset their progress

Open a card and you get the moment it came from: a poster frame you can click to play the clip in place, every dictionary sense rather than the first three, and the per-word breakdown for a phrase.

• Playing the clip here is just listening — it doesn't grade the card or spend your daily allowance
• Speak the word, reset its progress, or delete it from the same place

Star a video and it's waiting for you next time, at the second you stopped watching, with a count of the words you've taken from it. Videos you mined without starring show up too — looking words up is its own bookmark.

• "Continue at 6:41" — the extension remembers your position while you watch
• A curated starter shelf per language, for the days when the problem is finding something to watch
• Jump from any video straight to the cards it produced

The review queue also lives at lingokeep.com/review, installable to your home screen. Same cards, same schedule, so the ten minutes on the bus count.

• Add it to your home screen and it behaves like an app
• Reviews you do there are the same reviews — one deck, one schedule

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.

• An account is what makes your deck follow you, not what unlocks the product
• Sign in later and the cards you already saved come with you
• Your local data stays yours: erase it from this browser whenever you like

Cards, videos, review history and your daily limit sync to your account and back down to everywhere else you use LingoKeep — including the phone you review on.

• Syncs on its own, and tells you plainly when it last succeeded
• A delete stays deleted, instead of coming back from another device
• The same word saved from the same moment on two devices merges into one card

Your cards are yours. Pro exports the whole deck with the sentence, the glosses and the link back to the video moment — as a CSV from your Cards page, or pushed straight into Anki from the extension.

• CSV columns map cleanly onto Anki note fields
• The one-click push needs Anki's AnkiConnect add-on; the CSV never does
• The extension writes its CSV from the local deck — no server, works offline — once you're on Pro

The free plan holds 100 cards — enough to find out whether reviewing daily is a habit you'll keep. Pro removes the cap.

• Free: 100 cards, with every feature above included
• Pro: no limit — and nothing you've saved is ever deleted if you cancel

Grammar and nuance explanations for the sentence in front of you. Planned as a Pro perk — not built yet, and listed here rather than quietly implied.

• Not live yet; it's on this page so you can see where Pro is going
• Will ship with a fair-use allowance, like every feature that costs us money per use

Each language ships a real dictionary rather than a machine translation of a word list: over 100,000 entries each for Spanish, French and German, and more than 200,000 for Japanese, with millions of inflected forms mapped back to the words they come from.

• Japanese is segmented properly, so you can click a word in a sentence that has no spaces, and readings come with it
• Conjugations and declensions resolve to the dictionary word — "pregunta" finds "preguntar"
• A page is always in exactly one language, and starting a new one is a single switch
• The interface is in English

The extension runs on youtube.com and lingokeep.com and nowhere else, and we don't track what you watch. What reaches our servers is the cards you chose to save.

• No browsing-history or watch-history collection
• Analytics load only if you say yes, and the site works identically if you decline
• Export or delete your cards, or your whole account, whenever you want