Submate: Dual Subtitles for YT
Bilingual Captions for YouTube
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Learn languages from YouTube videos you already watch. Immerse yourself with dual subtitles, save moments as flashcards, and review them with AI-powered FSRS scheduling.
Submate helps you learn languages from YouTube videos you already watch.
Watch YouTube in the Submate app and see dual subtitles next to the video, or watch on your Smart TV and see dual subtitles on your phone.
Click the star icon to save useful words or sentences as video flashcards.
Submate has the best interface of any app for watching with dual subtitles directly on your phone, and is the only app that also supports watching on your smart TV.
And every flashcard is a video flashcard created from YouTube content you chose to watch yourself, so you study real dialogue in context instead of random word lists.
Features:
- Watch Youtube on your iPhone or iPad with dual subtitles
- Watch YouTube on your Smart TV or Apple TV with dual subtitles
- Save subtitle moments as flashcards
- Review flashcards made from real videos
- See translations and word-level learning help
- Use AI-powered FSRS review scheduling to only study cards right before you are predicted to forget them
- Build a personal library of words and phrases from videos you actually care about
Submate is built for language learners who want to turn watching YouTube into active study without leaving the content they already enjoy.
Submate is not affiliated with YouTube or Google.
Terms of Use: https://submate.app/terms.html
Privacy Policy: https://submate.app/privacy.html
Ratings & Reviews
Watch directly on your phone with an incredible UX.
The developer, Small Big Brands, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Small Big Brands LLC
- Size
- 47 MB
- Category
- Education
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 8 more
- English, French, German, Italian, Japanese, Simplified Chinese, Spanish, Thai, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Submate Pro (Yearly) $49.99
- Submate Pro (Monthly) $6.99
- Copyright
- © 2026 Small Big Brands LLC