# Pump vs Just VO2 Max

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

Both are free to download. Pump sells 2 in-app purchases, starting at $3.99 per month. Just VO2 Max asks for nothing beyond the download.

Pump ships an update every 2 weeks, Just VO2 Max every 6 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Pump | 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 | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Monetization | — | Ad-supported |
| Size | 126 MB | 14 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Oliver Galusinski](https://appshunter.io/developer/1741367023) | [Cuprea s.r.o.](https://appshunter.io/developer/6790557326) |

## What reviewers say

### Pump

[App page](https://appshunter.io/ios/app/pump-gym-workout-tracker/id6751585722)

**Features:** Apple Watch app, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pump Premium | $3.99 | per month |
| Pump Pro Yearly | $44.99 | per year |


### 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 Pump free?

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

### Is Just VO2 Max free?

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

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

Both Pump and Just VO2 Max show ads.

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

Pump ships an update every 2 weeks, and Just VO2 Max every 6 days. Most recently, Pump was updated on October 28, 2026 and Just VO2 Max on October 31, 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.*