# VO2 Max Tracker - Zephyrus — Running coach & cardio tests > VO₂ max and HIIT workout tracker with heart rate monitoring and progress tracking. (iPhone/iPad app by Havard Tryman.) - Source: https://appshunter.io/ios/app/vo2-max-tracker-zephyrus/id6450862734 (this page in markdown: same URL + `.md`) - Developer: [Havard Tryman](https://appshunter.io/developer/1662964293) - Category: Sports, Health & Fitness - Price: Free with in-app purchases - Rating: 4.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 16.6 · 14 MB - Languages: American English - Released: 2023-07-18 - Data updated: 2026-08-31 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/vo2-max-tracker-zephyrus/id6450862734/reviews.md ## What is VO2 Max Tracker? Use Zephyrus to test your cardio fitness (VO₂ max) on a treadmill, and track your improvement. You can also use Zephyrus to do HIIT workouts. The app comes with a selection of workouts, and lets you create your own workouts. Zephyrus tells you when the target zone changes. To get your heart rate in the app, you can use Apple Watch or heart rate monitors with Bluetooth. Garmin watches with Virtual Run are supported. Cardio fitness is measured with a modified Bruce protocol test you can perform on most treadmills. The test consists of stages with increasing intensity and ends when you reach 85% of maximum heart rate. You can do HIIT workouts on Apple Watch, so you don't have to bring your phone. Your past workouts are saved to your workout history, where you can see the heart rate graph and calories burned. Your data is stored in iCloud, which makes it accessible across your Apple devices. Always consult with a healthcare provider before starting any new exercise program. Exercise can carry risks, especially for people who have certain medical conditions or who have not been physically active in a long time. It's important to understand that using this app does not replace a doctor's advice or treatment. If you would like to report an issue or request a feature for the app, feel free to contact the App Support email. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - VO₂ max testing on treadmills - HIIT workout creation and selection - Real-time target zone guidance - Apple Watch and heart rate monitor integration - Workout history with heart rate graphs - iCloud data synchronization ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Pro | $8.99 | per 7 days | | Pro | $24.99 | per year | | Pro (Yearly) | $24.99 | per year | | Pro (Weekly) | $4.99 | per 7 days | | Pro (Monthly) | $7.99 | per month | | Pro (Yearly) | $59.99 | per year | ## Frequently asked questions about VO2 Max Tracker ### 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. ## Version history (last 5 releases) ### 1.4.9 — 2026-07-06 Improvements and bug fixes ### 1.4.8 — 2026-07-01 Improvements and bug fixes ### 1.4.7 — 2026-04-05 This version of VO2 Max Tracker - Zephyrus includes improvements and bug fixes ### 1.4.6 — 2026-02-28 This version of VO2 Max Tracker - Zephyrus includes improvements and bug fixes ### 1.4.5 — 2025-12-25 This version of VO2 Max Tracker - Zephyrus includes improvements and bug fixes ## Apps similar to VO2 Max Tracker | App | Rating | Price | Category | | --- | --- | --- | --- | | [Nemeko - Running Form Analysis](https://appshunter.io/ios/app/nemeko-running-form-analysis/id6737516228) | — | Free | Sports | | [SkyPacer: Pace Calculator](https://appshunter.io/ios/app/skypacer-pace-calculator/id1484045401) | — | Free | Sports | | [DailyTSS – Training Load](https://appshunter.io/ios/app/dailytss-training-load/id6448220292) | 5.0 (3) | Free | Sports | | [Firstbeat Sports: Coach](https://appshunter.io/ios/app/firstbeat-sports-coach/id1458840895) | 3.2 (12) | Free | Sports | | [Soccernet.ee](https://appshunter.io/ios/app/soccernetee/id1442839903) | — | Free | Sports | | [SpeedClimb Stopwatch](https://appshunter.io/ios/app/speedclimb-stopwatch/id6469708441) | — | Free | Sports | ## More apps by Havard Tryman - [Customtuner](https://appshunter.io/ios/app/customtuner/id1662964291) - [Classical Music Game - Mozart](https://appshunter.io/ios/app/classical-music-game-mozart/id6739008889) - [Streak Counter](https://appshunter.io/ios/app/streak-counter/id6739545352) - [Kalimba Tuner](https://appshunter.io/ios/app/kalimba-tuner/id6739851143) - [Songbookly: Songbook & Setlist](https://appshunter.io/ios/app/songbookly-songbook-and-setlist/id6739998746) All apps by Havard Tryman: https://appshunter.io/developer/1662964293 ## Related topics [max tracker](https://appshunter.io/ios/topics/max-tracker) · [vvfit max](https://appshunter.io/ios/topics/vvfit-max) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*