# 四年级奥数专业版 vs 纠错大师

The clearest difference is price: 纠错大师 at Free against 四年级奥数专业版's $0.99. 纠错大师 also leads on in-app purchases (none vs 4) and update cadence (fortnightly vs every 12 months). 四年级奥数专业版's advantage is iOS requirement (8.0 vs 15.0). On ads and device support there is nothing between them.

纠错大师 is free to download; 四年级奥数专业版 costs $0.99 up front. 四年级奥数专业版 sells 4 one-off in-app purchases. 纠错大师 asks for nothing beyond the download.

四年级奥数专业版 ships an update every 12 months, 纠错大师 fortnightly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 四年级奥数专业版 | 纠错大师 |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 12 months | **Fortnightly** |
| Size | 11 MB | 99 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [志军 王](https://appshunter.io/developer/842570665) | [杭州扶志科技有限公司](https://appshunter.io/developer/1651860833) |

## What reviewers say

### 四年级奥数专业版

[App page](https://appshunter.io/ios/app/id1208534417)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 试卷生成功能 | Free | one-time |
| 付费题目包(一) | Free | one-time |
| 无限制全部功能 | $0.99 | one-time |
| 付费题目包(二) | $0.99 | one-time |


### 纠错大师

[App page](https://appshunter.io/ios/app/ai/id6444046564)

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

**In-app purchases:** none


## Frequently asked questions

### Is 四年级奥数专业版 free?

四年级奥数专业版 costs $0.99, and also offers in-app purchases.

### Is 纠错大师 free?

纠错大师 is free to download, with no in-app purchases.

### Do 四年级奥数专业版 or 纠错大师 have ads?

Neither 四年级奥数专业版 nor 纠错大师 shows ads.

### Which is updated more often, 四年级奥数专业版 or 纠错大师?

四年级奥数专业版 ships an update every 12 months, and 纠错大师 fortnightly. Most recently, 四年级奥数专业版 was updated on November 2, 2026 and 纠错大师 on November 3, 2026.

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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.*