Learn English, Spanish and Other Languages Effortlessly with Interactive Dual Subtitles
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InterSub. AI-powered interactive dual subtitles and instant word translations make learning fun and effective.

InterSub. AI-powered interactive dual subtitles and instant word translations make learning fun and effective.
Boost your language skills while enjoying your favorite shows on YouTube, Netflix, Prime Video, Crunchyroll, TED and courses on Coursera, Udemy and LinkedIn Learning. We support English, Spanish and 30 other languages.
Boost your language skills while enjoying your favorite shows on YouTube, Netflix, Prime Video, Crunchyroll, TED and courses on Coursera, Udemy and LinkedIn Learning. We support English, Spanish and 30 other languages.

How it works

How it works

Dual Subtitles

Watch videos with subtitles in your target language and your native language side-by-side.

Instant Translations

Hover over any word in the subtitles to get an AI-generated instant definition and a context translation.

Personal Wordbook

All translated words are automatically saved to your personal vocabulary list (or "wordbook") for easy review.

Mobile Integration

Sync your wordbook to our mobile apps or Telegram bots for on-the-go learning.
Dual Subtitles
Watch videos with subtitles in your target language and your native language side-by-side.
Instant Translations
Hover over any word in the subtitles to get an AI-generated instant definition and a context translation.
Personal Wordbook
All translated words are automatically saved to your personal vocabulary list (or "wordbook") for easy review.
Mobile Integration
Sync your wordbook to our mobile apps or Telegram bots for on-the-go learning.

Key Features

Key Features

Multi-Platform Support

InterSub works on YouTube, Netflix, Prime Video, Crunchyroll, TED, Coursera, Udemy and LinkedIn Learning. And more to come.

Collocation Detection

InterSub's advanced AI recognizes English phrasal verbs, idioms, and compound nouns.

Remote Control

Use your phone to look up words while watching on a big screen.

"Show Subtitles on Pause"

Focus on the video, with subtitles only appearing when you need them.
Multi-Platform Support
InterSub works on YouTube, Netflix, Prime Video, Crunchyroll, TED, Coursera, Udemy and LinkedIn Learning. And more to come.
Collocation Detection
InterSub's advanced AI recognizes English phrasal verbs, idioms, and compound nouns.
Remote Control
Use your phone to look up words while watching on a big screen.
"Show Subtitles on Pause"
Focus on the video, with subtitles only appearing when you need them.

See InterSub. in action

See InterSub. in action
Grow your language skills with no extra time spent
Grow your language skills with no extra time spent

Our 8,000+ customers are fond of InterSub.

Our 8,000+ customers are fond of InterSub.
  • Elena
    Love the feature! My English is pretty good, but I'm not native, so, sometimes a little help could be handy. The fact that now I can check the translation without distraction is awesome! And it is completely worth the few bucks of a subscription.
  • Nick
    I was invited to the beta-test, and was quite impressed! Thank you, guys, and can't wait for the Dictionary function.
  • Alex
    This function is really helpful! Translation to French seems pretty accurate. It’s great that there is no need to interrupt watching if you didn't understand a new word.
Join thousands of InterSub. happy users and start watching videos smarter than ever!

Frequently asked questions

InterSub is a browser extension for Google Chrome, Microsoft Edge and Firefox designed for language learning and skill acquisition. It offers interactive dual subtitles and instant word translations on popular streaming and educational platforms like YouTube, Netflix, Prime Video, Udemy, Coursera, LinkedIn Learning, and TED.

Get Started with InterSub.

Get Started with InterSub.
InterSub is available as a free browser extension for Chrome, Edge, and Firefox. Download it today and transform your screen time into language learning time!
InterSub is available as a free browser extension for Chrome, Edge, and Firefox. Download it today and transform your screen time into language learning time!
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