# VO2 Max Tracker vs AXON Readiness

The clearest difference is in-app purchases: AXON Readiness at none against VO2 Max Tracker's 6. AXON Readiness also leads on update cadence (every 6 days vs every 2 weeks). VO2 Max Tracker's advantage is device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. VO2 Max Tracker sells 6 in-app purchases, starting at $4.99 per 7 days. AXON Readiness asks for nothing beyond the download.

VO2 Max Tracker ships an update every 2 weeks, AXON Readiness every 6 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | VO2 Max Tracker | AXON Readiness |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/vo2-max-tracker-zephyrus/id6450862734/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Monetization | Freemium | — |
| Size | 17 MB | 3 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Havard Tryman](https://appshunter.io/developer/1662964293) | [Mohammed Amine Allai](https://appshunter.io/developer/1878073536) |

## What reviewers say

### VO2 Max Tracker

[App page](https://appshunter.io/ios/app/vo2-max-tracker-zephyrus/id6450862734)

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.

**Highlights:** 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

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Weekly) | $4.99 | per 7 days |
| Pro (Monthly) | $7.99 | per month |
| Pro | $8.99 | per 7 days |
| Pro | $24.99 | per year |
| Pro (Yearly) | $24.99 | per year |
| Pro (Yearly) | $59.99 | per year |


### AXON Readiness

[App page](https://appshunter.io/ios/app/axon-readiness/id6762512330)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is VO2 Max Tracker free?

VO2 Max Tracker is free to download, with in-app purchases available.

### Is AXON Readiness free?

AXON Readiness is free to download, with no in-app purchases.

### Do VO2 Max Tracker or AXON Readiness have ads?

Neither VO2 Max Tracker nor AXON Readiness shows ads.

### Which is updated more often, VO2 Max Tracker or AXON Readiness?

VO2 Max Tracker ships an update every 2 weeks, and AXON Readiness every 6 days. Most recently, VO2 Max Tracker was updated on October 30, 2026 and AXON Readiness on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*