Video Speed: Slow & Fast
See the new length instantly
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Pick a speed and see how long it'll be — before you export.
Speed up a video or slow it down — and know exactly how long it'll be before you commit.
Every other speed app makes you export first to find out. Speed shows you "4:32 → 1:08"
the moment you pick a speed.
• 0.25× to 4× — see the new length instantly
• Sound is kept and stays in sync; drop it with a tap when it's too fast to listen to
• Portrait stays portrait
• Works entirely offline. Nothing is uploaded, ever.
• No ads. No account. No subscription.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Added a list of our other apps in Settings.
The developer, keisuke haraguchi, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- keisuke haraguchi
- Size
- 408.6 KB
- Category
- Photo & Video
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 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
- Age Rating
4+
- 4+
- Copyright
- © 2026 comet