# Simple Ring Puzzle vs Feynman rules

The clearest difference is ads: Feynman rules at none against Simple Ring Puzzle's shown. Simple Ring Puzzle's advantage is iOS requirement (8.1 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 | Simple Ring Puzzle | Feynman rules |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 24 months | — |
| Size | 65 MB | 6 MB |
| Requires iOS | **8.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ruslan Goncharenko](https://appshunter.io/developer/934710362) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### Simple Ring Puzzle

[App page](https://appshunter.io/ios/app/simple-ring-puzzle/id1355462031)

**Features:** macOS Compatibility

**In-app purchases:** none


### Feynman rules

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Simple Ring Puzzle free?

Simple Ring Puzzle is free to download, with no in-app purchases.

### Is Feynman rules free?

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

### Do Simple Ring Puzzle or Feynman rules have ads?

Simple Ring Puzzle 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.*