Learn a language from the shows you already watch.
LangHub is a whole language toolkit: dual-language subtitles & a hover dictionary on Netflix and YouTube, plus a web app to read, review, practice, and speak — all sharing the same saved-word vocabulary.
Everything to learn a language, in one place
An extension for watching, plus a web app to read, review, practice, and speak — each feeding the same saved-word vocabulary.
Watch
Dual subtitles & a hover dictionary on Netflix & YouTube.
Read
Drop in any article or PDF and tap any word.
Review
Spaced-repetition flashcards that schedule themselves.
Practice
Arcade fill-in-the-blank from real frequency lists.
Speak
An AI tutor you chat with — by text or live voice.
A whole study setup, baked into the player
No second screen, no copy-pasting subtitles. Comprehension help shows up exactly where you're already looking.
Dual-language subtitles
Your target language and your own, perfectly stacked and frame-accurate. No flicker, no lag — synced to the exact frame on screen.
Instant hover dictionary
Point at any word for a translation, reading, and definition. Real word segmentation even for Chinese, Japanese & Thai — no spaces required.
Smart playback
Auto-pause at the end of each line so you can actually hear it. A replays the line, S plays/pauses, D jumps to the next.
Save words in one tap
Tap a word — or a whole line — and it lands in your personal vocabulary bank, with the sentence it came from kept as context.
Full transcript sidebar
Open the script panel to read the whole dialogue, follow along as it highlights, and click any line to jump straight to that moment.
Sync across devices
Sign in and your saved words follow you — from the player to the web app and back — automatically backed up to your account.
From “what did they just say?” to fluent
LangHub fits into the watching you'd be doing anyway.
Install & press play
Add the extension, open any Netflix or YouTube video, and dual subtitles appear automatically over the player.
Watch & tap
Let lines auto-pause, hover words you don't know, and tap to save the keepers — without ever leaving the show.
Review & speak
Open the web app to drill saved words with flashcards, fill-in-the-blank practice, and a tutor you talk to out loud.
Four tools that turn watching into memory
Open it in any browser and start right away. Read, review, practice, and speak — every tool shares the same vocabulary you build while you watch.
Cards that know your memory
Flip 3D cards, hear native pronunciation, write your own sentences — and grade yourself with four buttons. A spaced-repetition engine (FSRS) schedules each word for the day you're about to forget it.
- FSRS scheduling — review only what's due
- Auto leech-detection flags stubborn words
- Filter by language & shuffle the deck
- Export a listening pack of your saved lines
Fill-in-the-blank, arcade style
The Practice tab drops your words into AI-written sentences with one word blanked out. Multiple-choice or type-it-in, with a streak counter, lives, and a combo bar — same memory engine underneath.
- Frequency “Fast Tracks” to start from the words that matter most
- Sentences generated on the fly for words you actually know
- Synced and scheduled right alongside your flashcards
Read anything — and hear it read back
Paste an article or drop in a PDF, then tap any word for its meaning, an example, grammar and pronunciation. Hit play and each paragraph is read aloud, highlighting the words as they're spoken.
- PDF & text extracted in your browser — never uploaded
- Read-aloud karaoke highlighting, sentence by sentence
- Saved texts build a library that syncs to your account
A tutor that talks back — then shows its notes
Chat by text or jump into a live voice call. Pick a role-play scenario — café, airport, job interview — and when you hang up, you get a recap card of every correction and new word, one tap to save.
- Live mic conversation with natural spoken replies
- Role-play scenarios & saved conversation history
- Recap words save straight into flashcards & practice
Learn in the language you're watching
Powered by your browser's built-in segmentation, so even unspaced scripts break into real, lookup-able words.
Your data stays yours
Saved words and sentences live in your own browser by default. Sign in only if you want them synced — nothing is sold or shared.
Light on the page
A handful of overlay elements re-rendered only at line boundaries. It rides along with the player without bogging it down.
Free to start
The dictionary, subtitles, playback, flashcards, and practice work out of the box. AI features run on a shared key — no setup needed.
Start free. Go Pro when you're hooked.
Watch, save words, and study for free. Upgrade for unlimited AI and the voice tutor.
Free
Everything you need to learn from what you watch.
- Dual-language subtitles & hover dictionary
- Save words, flashcards & fill-in-the-blank practice
- AI translations (daily limit)
- Sync across the web app & extension
Pro
Unlimited AI and the full voice tutor.
- Everything in Free
- Unlimited AI translations & tutor chat
- Live voice calls & role-play scenarios
- Audio export & natural pronunciation
Cancel anytime — manage your subscription right from the app's settings.
Good to know
Which sites does it work on? ＋
Do I need an account? ＋
What's the Practice tab? ＋
Is it free? ＋
Which languages are supported? ＋
What about my privacy? ＋
Your next binge could teach you a language.
Add LangHub, press play, and start collecting words from the shows you already love.