# Slather vs Just VO2 Max

The clearest difference is in-app purchases: Just VO2 Max at none against Slather's 2. Just VO2 Max also leads on update cadence (every 6 days vs every 2 months) and iOS requirement (17.0 vs 26.0). Slather's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Slather sells 2 in-app purchases, starting at $4.99 per year. Just VO2 Max asks for nothing beyond the download.

Slather ships an update every 2 months, Just VO2 Max every 6 days. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Slather | 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 | **No** | Yes |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | — | Ad-supported |
| Size | 9 MB | 14 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [David Price](https://appshunter.io/developer/1087027317) | [Cuprea s.r.o.](https://appshunter.io/developer/6790557326) |

## What reviewers say

### Slather

[App page](https://appshunter.io/ios/app/slather-up/id6775721110)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Slather Premium | $4.99 | per year |
| Slather Premium Lifetime | $14.99 | one-time |


### 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 Slather free?

Slather 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 Slather or Just VO2 Max have ads?

Just VO2 Max shows ads; Slather does not.

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

Slather ships an update every 2 months, and Just VO2 Max every 6 days. Most recently, Slather was updated on November 10, 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.*