InterSub
Interactive dual subtitles browser extension for language learning on major streaming platforms.
What is InterSub?
InterSub is an interactive dual subtitles extension and language learning tool designed for browser environments. Functioning as a dual subtitles & subtitle translator - intersub, the tool assists users in watching videos on major streaming platforms like YouTube, Netflix, Prime Video, Coursera, and Udemy with dual language subtitles. The intersub extension allows users to practice language acquisition, such as dual subtitles japanese learning, by providing instant context translations upon hovering over unfamiliar words and automatically saving them to a personal wordbook. It acts as a comprehensive dual language subtitles extension to make language comprehension more accessible during media consumption.
Best InterSub use cases by task, role, industry, and platform
These use cases show where InterSub fits best, ranked by fit score before popularity or pricing.
InterSub Pricing Plans
Compare InterSub free options, InterSub paid pricing plans, and usage notes before you choose the best way to use this AI tool in 2026.
Free, Premium from $5/mo
Includes a 14-day trial of Premium, 15 new word lookups per month (or unlimited with ads), unlimited dual subtitles without AI translation on-the-fly, and limited wordbook access.
Provides options for 50, 100, 200, or 500 word lookups, unlimited access to your wordbook, unlimited dual subtitles with on-the-fly AI translation, weekly reminders, and limited mobile sync.
Provides unlimited word lookups, unlimited dual subtitles, unlimited wordbook access, weekly frequent word reminders, and full access to word training mobile apps and bots.
Pricing updated:Jun 12, 2026
InterSub AI Features
InterSub Pros and Cons
Pros
- Integrates with popular platforms including YouTube, Netflix, Prime Video, Coursera, and Udemy
- Saves learning progress and encountered vocabulary automatically
- Provides translation on-the-fly if a video lacks subtitles in the native language
- Offers convenient hotkeys for adjusting subtitle size, position, and toggling pause modes
Limitations
- Requires an active internet connection to perform real-time translations
- Full offline use is not supported