Learn a language from the shows you already watch.
LangHub overlays dual-language subtitles, an instant hover dictionary, and smart playback onto Netflix & YouTube. Tap any word to save it — then lock it in with flashcards and an AI chat tutor.
A whole study setup, built into the player
No second screen, no copy-pasting subtitles. Comprehension help appears 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 click
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 your saved words as flashcards and practice them out loud with an AI chat tutor.
Every word you saved, ready to review
Watching builds your word list. The web app turns it into memory — flashcards, pronunciation, and a tutor that talks back.
🃏 Flashcards that stick
Study saved words on 3D flip cards, hear native pronunciation, and write your own sentences to make them yours.
- Filter by language and shuffle your deck
- Mark words “known” to focus on what's left
- Export a listening pack of your saved lines
💬 An AI tutor that talks back
Chat — by text or live voice — in your target language. Get gentle corrections and tap any reply to save new words.
- Spoken replies & live mic conversation
- Native-coach rewrites of what you said
- Graded suggestions for what to say next
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, and flashcards 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 & study with flashcards
- ✅ 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 with the AI tutor
- ⭐ 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? ＋
Is it free? ＋
Which languages are supported? ＋
How do I save and review words? ＋
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.