# Crazy arithmetic Competition vs 研成了

The clearest difference is in-app purchases: Crazy arithmetic Competition at none against 研成了's 1. Crazy arithmetic Competition also leads on update cadence (every 3 months vs every 12 months). 研成了's advantage is iOS requirement (11.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. 研成了 sells 1 one-off in-app purchase. Crazy arithmetic Competition asks for nothing beyond the download.

Crazy arithmetic Competition ships an update every 3 months, 研成了 every 12 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Crazy arithmetic Competition | 研成了 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 12 months |
| Size | 10 MB | 42 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [正洪 王](https://appshunter.io/developer/1041876354) | [鑫 李](https://appshunter.io/developer/1614393207) |

## What reviewers say

### Crazy arithmetic Competition

[App page](https://appshunter.io/ios/app/crazy-arithmetic-competition/id1483559516)

**In-app purchases:** none


### 研成了

[App page](https://appshunter.io/ios/app/id1619245711)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 管理类综合•联考写作•精讲课 | $299.99 | one-time |


## Frequently asked questions

### Is Crazy arithmetic Competition free?

Crazy arithmetic Competition is free to download, with no in-app purchases.

### Is 研成了 free?

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

### Do Crazy arithmetic Competition or 研成了 have ads?

Neither Crazy arithmetic Competition nor 研成了 shows ads.

### Which is updated more often, Crazy arithmetic Competition or 研成了?

Crazy arithmetic Competition ships an update every 3 months, and 研成了 every 12 months. Most recently, Crazy arithmetic Competition was updated on October 29, 2026 and 研成了 on October 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*