# 结构大师 vs Relativity Simulator

The clearest difference is in-app purchases: Relativity Simulator at none against 结构大师's 4. 结构大师's advantage is iOS requirement (9.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. 结构大师 sells 4 one-off in-app purchases. Relativity Simulator asks for nothing beyond the download.

## The numbers

| Metric | 结构大师 | Relativity Simulator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 100 MB | 15 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [颖达 陈](https://appshunter.io/developer/1058507663) | [际 郭](https://appshunter.io/developer/6797282134) |

## What reviewers say

### 结构大师

[App page](https://appshunter.io/ios/app/id1058507664)

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 高级功能购买 | $3.99 | one-time |
| 解锁当前版本SM | $19.99 | one-time |
| 打赏 | $24.99 | one-time |
| 解锁全版本 | $24.99 | one-time |


### Relativity Simulator

[App page](https://appshunter.io/ios/app/relativity-simulator/id6811289729)

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

**In-app purchases:** none


## Frequently asked questions

### Is 结构大师 free?

结构大师 is free to download, with in-app purchases available.

### Is Relativity Simulator free?

Relativity Simulator is free to download, with no in-app purchases.

### Do 结构大师 or Relativity Simulator have ads?

Neither 结构大师 nor Relativity Simulator 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.*