# VO2Max Training vs Z2/4×4 Trainer

The clearest difference is update cadence: VO2Max Training at every 11 days against Z2/4×4 Trainer's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. VO2Max Training sells 2 in-app purchases, starting at $4.99 per month and Z2/4×4 Trainer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

VO2Max Training ships an update every 11 days, Z2/4×4 Trainer every 3 weeks. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | VO2Max Training | Z2/4×4 Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (8 ratings)](https://appshunter.io/ios/app/vo2max-training/id6751254440/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 28 MB | 5 MB |
| Requires iOS | 18.2 | **18.0** |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Hesam Andalib](https://appshunter.io/developer/6780282869) | [Chenfei Chu](https://appshunter.io/developer/6776864992) |

## What reviewers say

### VO2Max Training

[App page](https://appshunter.io/ios/app/vo2max-training/id6751254440)

Improve your cardiovascular fitness with science-backed training protocols and real-time coaching. Track your progress, visualize trends, and receive AI-powered insights to enhance your body's oxygen utilization for better health and longevity.

**Highlights:** Science-backed training protocols, Real-time Apple Watch coaching, Progress tracking and visualization, AI-powered personalized insights, Fitness age monitoring, Workout history

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VO2Max Premium Monthly | $4.99 | per month |
| VO2Max Premium Yearly | $49.99 | per year |


### Z2/4×4 Trainer

[App page](https://appshunter.io/ios/app/z244-trainer/id6776864990)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Z2/4×4 Pro (Lifetime) | $14.99 | one-time |


## Frequently asked questions

### Is VO2Max Training free?

VO2Max Training is free to download, with in-app purchases available.

### Is Z2/4×4 Trainer free?

Z2/4×4 Trainer is free to download, with in-app purchases available.

### Do VO2Max Training or Z2/4×4 Trainer have ads?

Neither VO2Max Training nor Z2/4×4 Trainer shows ads.

### Which is updated more often, VO2Max Training or Z2/4×4 Trainer?

VO2Max Training ships an update every 11 days, and Z2/4×4 Trainer every 3 weeks. Most recently, VO2Max Training was updated on October 17, 2026 and Z2/4×4 Trainer on October 11, 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.*