# Feynman rules vs 삼체

The clearest difference is price: Feynman rules at Free against 삼체's $0.99. Feynman rules also leads on in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Feynman rules is free to download; 삼체 costs $0.99 up front. 삼체 sells 1 one-off in-app purchase. Feynman rules asks for nothing beyond the download.

## The numbers

| Metric | Feynman rules | 삼체 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Size | 6 MB | 1 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [hyeonsu jeong](https://appshunter.io/developer/1628268684) |

## What reviewers say

### Feynman rules

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

**Features:** macOS Compatibility

**In-app purchases:** none


### 삼체

[App page](https://appshunter.io/ios/app/id6499065861)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | one-time |


## Frequently asked questions

### Is Feynman rules free?

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

### Is 삼체 free?

삼체 costs $0.99, and also offers in-app purchases.

### Do Feynman rules or 삼체 have ads?

Neither Feynman rules nor 삼체 shows ads.

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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.*