InterSub: Interactive Dual Subtitles for Language Learning

InterSub

3.5 | 284 | 0
Type:
Extension Plugin
Last Updated:
2025/08/31
Description:
InterSub is a Chrome extension that provides interactive dual subtitles and instant word translations for effortless language learning on YouTube, Netflix, and more. Build your vocabulary while watching videos.
Share:
language learning
dual subtitles
video translation
vocabulary builder
chrome extension

Overview of InterSub

InterSub: Learn Languages Effortlessly with Interactive Dual Subtitles

What is InterSub? InterSub is a browser extension designed for Google Chrome, Microsoft Edge, and Firefox that helps you learn languages more effectively while watching videos. It provides interactive dual subtitles and instant word translations on platforms like YouTube, Netflix, Prime Video, Coursera, Udemy, LinkedIn Learning, and TED.

How does InterSub work? InterSub uses AI-powered dual subtitles, displaying both your target language and native language subtitles side-by-side. If subtitles are not available in your language, InterSub will translate them on the fly. You can hover over any word in the subtitles to get an AI-generated instant definition and context translation. All translated words are automatically saved to your personal vocabulary list (wordbook) for easy review.

Key Features:

  • AI-assisted Dual Subtitles: Watch videos with subtitles in both your target and native languages.
  • Instant Translations: Get AI-powered definitions and context translations by hovering over any word.
  • Personal Wordbook: Automatically save translated words to your vocabulary list for later review.
  • Mobile Integration: Sync your wordbook to mobile apps like Anki or Telegram bots for learning on the go.
  • Multi-Platform Support: Works on YouTube, Netflix, Prime Video, HBO Max, Crunchyroll, TED, Coursera, Udemy, and LinkedIn Learning.
  • Collocation Detection: InterSub's 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: Subtitles only appear when you pause the video.

Why is InterSub important? InterSub helps you learn languages passively by immersing yourself in content you already enjoy. The dual subtitles provide immediate context, while the instant translations help you understand new words without interrupting your viewing experience. The personal wordbook feature ensures that you retain the vocabulary you learn.

How to Use InterSub:

  1. Install the InterSub Chrome extension.
  2. Go to YouTube, Netflix, or another supported platform.
  3. Start watching a video with subtitles.
  4. InterSub will automatically display dual subtitles.
  5. Hover over any word to see its definition and context translation.
  6. The translated word will be saved to your personal wordbook.

User Reviews:

  • 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."

Frequently Asked Questions:

  • What platforms does InterSub support? YouTube, Netflix, Prime Video, HBO, Crunchyroll, TED, Coursera, Udemy and LinkedIn Learning.
  • Is InterSub suitable for beginners? Yes, it is suitable for all levels.
  • Can I use InterSub for multiple languages? Yes, it supports English, Spanish, and 30 other languages.
  • How much does InterSub cost? InterSub is available as a free browser extension.

Where can I use InterSub? You can use InterSub on any of the supported platforms, including YouTube, Netflix, Prime Video, HBO Max, Crunchyroll, TED, Coursera, Udemy, and LinkedIn Learning. It also works on almost any website for looking up words.

Get Started:

  1. Install the free Chrome extension.
  2. Start watching videos and learning languages!

In conclusion, InterSub is a powerful browser extension that makes learning languages fun and effortless. With its interactive dual subtitles, instant translations, and personal wordbook, InterSub helps you build your vocabulary and improve your language skills while enjoying your favorite videos. It is available for free on Chrome, Edge and Firefox.

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