Video Speedifier
Control video speed playback
Free
Take control of video speed on any site. 0.01×–5× slider, presets, Slo-mo, Overdrive, and reliable keyboard shortcuts—even with the popup closed.
Take control of every video you watch.
Video Speedifier is a clean, powerful Safari extension that lets you adjust playback speed on any website with precision and ease.
Use the smooth slider for fine-grained control (0.1× increments) or tap the quick preset buttons for common speeds. Turn on Overdrive when you want to push speeds even higher, or take it slow with Slo-mo mode. It works across YouTube, Netflix, online courses, Twitch, and most other video players — including tricky ones that try to reset the speed.
Key Features
• Precise speed control from 0.01× up to 5×
• Customizable preset buttons
• Overdrive mode for faster playback
• Slo-mo mode for slower playback
• Works on iPhone, iPad, and Mac
• Clean, modern interface built with SwiftUI
• Intelligent handling of dynamic and embedded videos
Getting started is simple: install the app, enable Video Speedifier in Safari’s Extensions settings, and you’re ready to go. The extension then appears in your toolbar whenever you need it.
Whether you’re speeding through lectures, slowing down language content, or just want to watch at your own pace, Video Speedifier gives you full control without leaving the page.
Slo-mo is here. Slow any video down to 0.01×.
Turn on Slo-mo for a 0.01×–1× slider and presets at 0.01×, 0.1×, 0.25×, 0.5×, 0.8×, and 1×. Overdrive still takes you up to 5×.
The developer, Justin James, 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
- Justin James
- Size
- 10.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Justin James