VO2 Max Tracker - Zephyrus
Measure & improve your cardio
About
Measure your cardio fitness (VO₂ max) using a treadmill test and track your progress. Create or select from pre-made HIIT workouts, with real-time guidance on target zones. Integrates with Apple Watch and Bluetooth heart rate monitors.
What's New in VO2 Max Tracker
1.4.9
July 6, 2026
Improvements and bug fixes
Subscription plans
Pro
Unlock Pro Features
Developer apps
FAQ
How does VO2 Max Tracker measure VO₂ max?
VO2 Max Tracker uses a modified Bruce protocol test performed on most treadmills. This test involves stages of increasing intensity, ending when you reach 85% of your maximum heart rate.
Can I use VO2 Max Tracker without a phone?
Yes, you can perform HIIT workouts directly on your Apple Watch without needing to bring your phone. This allows for greater convenience during your training sessions.
What devices can I use to get my heart rate?
You can use Apple Watch or any heart rate monitors that support Bluetooth to get your heart rate data within the app. Garmin watches with Virtual Run are also supported.
Does VO2 Max Tracker have ads?
No, VO2 Max Tracker does not contain advertisements. The app is ad-free, allowing for an uninterrupted user experience.
How often is VO2 Max Tracker updated?
The app was last updated on April 5, 2026, indicating a recent update. The latest version is 1.4.7.
What are the subscription options for VO2 Max Tracker?
VO2 Max Tracker offers several subscription plans, including weekly, monthly, and yearly options. For example, the Pro (Weekly) plan is $4.99/P7D and includes a 7-day free trial.
Is VO2 Max Tracker suitable for all ages?
VO2 Max Tracker has an age rating of 4+, making it suitable for a wide range of users. However, it's always recommended to consult with a healthcare provider before starting any new exercise program.
Where is my data stored?
Your workout data is stored in iCloud, ensuring it is accessible across all your Apple devices. This synchronization makes it easy to track your progress from any of your compatible devices.