# Feynman rules vs Challenge Gymnastics Champion

The clearest difference is ads: Feynman rules at none against Challenge Gymnastics Champion's shown. Challenge Gymnastics Champion's advantage is iOS requirement (12.0 vs 16.0). 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.

## The numbers

| Metric | Feynman rules | Challenge Gymnastics Champion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Every 3 months |
| Size | 6 MB | 103 MB |
| Requires iOS | 16.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [Mykola Biloivan](https://appshunter.io/developer/1569389671) |

## What reviewers say

### Feynman rules

[App page](https://appshunter.io/ios/app/feynman-rules/id6478752222)

**Features:** macOS Compatibility

**In-app purchases:** none


### Challenge Gymnastics Champion

[App page](https://appshunter.io/ios/app/challenge-gymnastics-champion/id6502851464)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Feynman rules free?

Feynman rules is free to download, with no in-app purchases.

### Is Challenge Gymnastics Champion free?

Challenge Gymnastics Champion is free to download, with no in-app purchases.

### Do Feynman rules or Challenge Gymnastics Champion have ads?

Challenge Gymnastics Champion shows ads; Feynman rules does not.

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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.*