# Onyx CSS vs Max HR

The clearest difference is update cadence: Max HR at every 2 months against Onyx CSS's every 6 months. Onyx CSS's advantage is iOS requirement (13.0 vs 15.6). On price, ads, 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.

Onyx CSS ships an update every 6 months, Max HR every 2 months. The most recent releases landed on September 23, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Onyx CSS | Max HR |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Size | 24 MB | 67 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ultimate Solutions](https://appshunter.io/developer/1190319655) | [Mahmoud Al-BAHERI](https://appshunter.io/developer/1477096761) |

## What reviewers say

### Onyx CSS

[App page](https://appshunter.io/ios/app/onyx-css/id1561190933)

**Features:** macOS Compatibility

**In-app purchases:** none


### Max HR

[App page](https://appshunter.io/ios/app/max-hr/id6757756911)

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

**In-app purchases:** none


## Frequently asked questions

### Is Onyx CSS free?

Onyx CSS is free to download, with no in-app purchases.

### Is Max HR free?

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

### Do Onyx CSS or Max HR have ads?

Neither Onyx CSS nor Max HR shows ads.

### Which is updated more often, Onyx CSS or Max HR?

Onyx CSS ships an update every 6 months, and Max HR every 2 months. Most recently, Onyx CSS was updated on September 23, 2026 and Max HR on October 6, 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.*