Watch any YouTube video with the original line and your language, together — on iPhone and iPad.
Real sentences that read naturally, instead of the word-by-word machine translation YouTube hands you.
Pick the language you are learning in, and switch it any time. The interface itself speaks twelve.
The line being spoken scrolls into place, and the current word lights up as you hear it.
Text size, colour of each line, and subtitle position — adjustable, and adjustable while the video is full screen.
| Free | Pro | |
|---|---|---|
| AI-translated videos | 3 a day | Unlimited |
| Out of translations | Wait until tomorrow | Never happens |
DuoSub is free to use for as long as you like. Pro is a subscription billed by the App Store and can be cancelled at any time.
iOS 17 or later. Videos must have captions on YouTube — DuoSub reads the captions that are already there, it does not transcribe audio.