# GridLinx vs Feynman rules

The clearest difference is in-app purchases: Feynman rules at none against GridLinx's 6. Feynman rules also leads on ads (none vs shown). GridLinx's advantage is iOS requirement (12.0 vs 16.0). On price and device support there is nothing between them.

Both are free to download. GridLinx sells 6 one-off in-app purchases. Feynman rules asks for nothing beyond the download.

## The numbers

| Metric | GridLinx | Feynman rules |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 16 months | — |
| Size | 159 MB | 6 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Player1games Inc.](https://appshunter.io/developer/1040547964) | [Sungjun Kim](https://appshunter.io/developer/1602461985) |

## What reviewers say

### GridLinx

[App page](https://appshunter.io/ios/app/gridlinx/id1458926332)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gridlinx Skins | $0.99 | one-time |
| Buy 10 time tokens | $0.99 | one-time |
| Buy 30 tokens special price | $0.99 | one-time |
| Gridlinx - No more ads special | $0.99 | one-time |
| No More Ads | $1.99 | one-time |
| Buy 30 time tokens | $1.99 | one-time |


### Feynman rules

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GridLinx free?

GridLinx is free to download, with in-app purchases available.

### Is Feynman rules free?

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

### Do GridLinx or Feynman rules have ads?

GridLinx 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.*