# VO2 Prime vs Just VO2 Max

The clearest difference is ads: VO2 Prime at none against Just VO2 Max's shown. VO2 Prime also leads on iOS requirement (15.1 vs 17.0). Just VO2 Max's advantage is update cadence (every 6 days vs monthly). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

VO2 Prime ships an update monthly, Just VO2 Max every 6 days. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | VO2 Prime | Just VO2 Max |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/just-vo2-max/id6790672784/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 6 days** |
| Monetization | — | Ad-supported |
| Size | 62 MB | 14 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [EndoMedical Inc](https://appshunter.io/developer/1290814301) | [Cuprea s.r.o.](https://appshunter.io/developer/6790557326) |

## What reviewers say

### VO2 Prime

[App page](https://appshunter.io/ios/app/vo2-prime/id6748883572)

**Features:** Apple Watch app

**In-app purchases:** none


### Just VO2 Max

[App page](https://appshunter.io/ios/app/just-vo2-max/id6790672784)

Displays your most recent VO2 Max reading from Apple Health directly on your Apple Watch face. It refreshes automatically when new data is available after your workout, keeping your health information private and on your device.

**Highlights:** VO2 Max display, Apple Health integration, Automatic refresh, On-device data storage, Read-only data access

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is VO2 Prime free?

VO2 Prime is free to download, with no in-app purchases.

### Is Just VO2 Max free?

Just VO2 Max is free to download, with no in-app purchases.

### Do VO2 Prime or Just VO2 Max have ads?

Just VO2 Max shows ads; VO2 Prime does not.

### Which is updated more often, VO2 Prime or Just VO2 Max?

VO2 Prime ships an update monthly, and Just VO2 Max every 6 days. Most recently, VO2 Prime was updated on October 21, 2026 and Just VO2 Max on October 24, 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.*