Norwegian 4x4 Timer
VO2 max interval protocol
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Norwegian 4x4 Timer is a simple, free app to guide you through intervals for the Norwegian 4x4 Protocol. It can also be customized to adjust interval durations and number. Use it to amp up your cardio and VO2 Max.
Whether it's running, rowing, jump rope, cycling, or other forms of cardio training, this is your trusted companion to know when to push yourself and when to rest in your interval workout.
Ratings & Reviews
• Added prompt for review after completing a few workouts
• Allow resuming workouts if the app is killed during an active workout
The developer, No Translation Layer LLC, 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
- No Translation Layer LLC
- Size
- 1.7 MB
- Category
- Sports
- 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 No Translation Layer LLC