# ChM Academy vs St.Gall Algorithm

The clearest difference is update cadence: ChM Academy at daily against St.Gall Algorithm's every 3 weeks. St.Gall Algorithm's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 18.5). On price, ads and in-app purchases there is nothing between them.

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

ChM Academy ships an update daily, St.Gall Algorithm every 3 weeks. The most recent releases landed on September 30, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | ChM Academy | St.Gall Algorithm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Daily** | Every 3 weeks |
| Size | 26 MB | 26 MB |
| Requires iOS | 18.5 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Jedrzej Serwik](https://appshunter.io/developer/1531792060) | [HOCH Health Ostschweiz](https://appshunter.io/developer/1378566484) |

## What reviewers say

### ChM Academy

[App page](https://appshunter.io/ios/app/chm-academy/id6746156382)

**Features:** macOS Compatibility

**In-app purchases:** none


### St.Gall Algorithm

[App page](https://appshunter.io/ios/app/stgall-algorithm/id6766456299)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ChM Academy free?

ChM Academy is free to download, with no in-app purchases.

### Is St.Gall Algorithm free?

St.Gall Algorithm is free to download, with no in-app purchases.

### Do ChM Academy or St.Gall Algorithm have ads?

Neither ChM Academy nor St.Gall Algorithm shows ads.

### Which is updated more often, ChM Academy or St.Gall Algorithm?

ChM Academy ships an update daily, and St.Gall Algorithm every 3 weeks. Most recently, ChM Academy was updated on September 30, 2026 and St.Gall Algorithm 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.*