DuoSub: Subtitle Translator
Translate, display subtitles
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Update UI
Watch YouTube in two languages at once.
DuoSub plays a video with two subtitle lines: the original line, and your own language right underneath it. Nothing to download, no subtitle files to hunt for, no settings to fight with.
HOW IT WORKS
1. Bring in a video — paste a link, share it from the YouTube app, or find it in the built-in Browse tab.
2. Choose the language for the second line.
3. Press play. Both lines run with the video, word by word.
WHAT YOU GET
• Dual subtitles — the original on top, your translation below, always in sync.
• 90 languages for the translated line, from Vietnamese, Spanish and Japanese to Arabic, Hindi and Ukrainian.
• Karaoke highlighting that frames the word being spoken, so you never lose your place.
• A full transcript that scrolls along with the video — tap any line to jump to that moment.
• Your subtitles, your way: text size, a colour for each line, karaoke on or off — adjustable without leaving fullscreen.
• A real player: drag the seek bar, tap to pause, swipe for brightness and volume, hold for 2x, lock the screen.
• A library that keeps every video you add, with its subtitles saved on your device so replays start instantly.
• The app itself in 12 languages, switchable any time without a restart.
WHO IT'S FOR
People learning a language from real videos instead of textbook audio. Listeners who want an hour-long podcast to stop being a wall of sound. Students following courses recorded in another language. Anyone reading foreign news and documentaries as they play.
DUOSUB PRO
Free: translate up to 3 new videos a day. Videos that have already been translated open for free and don't use up your daily count.
Pro: unlimited translation, every language, every day.
• 1 month — 149,000 ₫
• 3 months — 299,000 ₫
• 12 months — 799,000 ₫
Prices shown are for Vietnam; your local price appears on the purchase screen before you pay. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless it is turned off at least 24 hours before the end of the current period. Manage or cancel any time in your Apple ID settings.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://duosub-1ae27.web.app/privacy
GOOD TO KNOW
DuoSub works with videos that have captions available. Videos play through YouTube's own player — DuoSub does not download or store video. DuoSub is an independent app and is not affiliated with, endorsed by or sponsored by YouTube or Google.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Update UI
The developer, Vui Nguyen, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Vui Nguyen
- Size
- 12.2 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 40 more
- English, Arabic, Bengali, Bulgarian, Croatian, Czech, Danish, Dutch, Estonian, Filipino, Finnish, French, German, Greek, Hindi, Hungarian, Indonesian, Irish, Italian, Japanese, Korean, Latvian, Lithuanian, Malay, Maltese, Norwegian Bokmål, Persian, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
16+
- 16+
- Infrequent
Cartoon or Fantasy Violence
Realistic Violence
Profanity or Crude Humor
Mature or Suggestive Themes
Horror/Fear Themes
Alcohol, Tobacco, Drug Use or References
Sexual Content or Nudity
Guns or Other Weapons
Contains
Unrestricted Web Access
Advertising
- In-App Purchases
Yes
- DuoSub Pro - 3 Months $9.99
- DuoSub Pro - 1 Year $24.99
- DuoSub Pro - 1 Month $4.99
- Copyright
- © Iwy2th