# 学习成长21天 vs 初中数学思维

The clearest difference is price: 学习成长21天 at Free against 初中数学思维's $1.99. 学习成长21天 also leads on device support (3 vs 1) and iOS requirement (9.0 vs 26.1). On ads and in-app purchases there is nothing between them.

学习成长21天 is free to download; 初中数学思维 costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 学习成长21天 | 初中数学思维 |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Size | 66 MB | 5 MB |
| Requires iOS | **9.0** | 26.1 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Guangdong Youyixue Education Technology Co., Ltd.](https://appshunter.io/developer/1508981243) | [宝珍 杜](https://appshunter.io/developer/1825073574) |

## What reviewers say

### 学习成长21天

[App page](https://appshunter.io/ios/app/21/id1518769944)

**In-app purchases:** none


### 初中数学思维

[App page](https://appshunter.io/ios/app/id6797459306)

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

**In-app purchases:** none


## Frequently asked questions

### Is 学习成长21天 free?

学习成长21天 is free to download, with no in-app purchases.

### Is 初中数学思维 free?

初中数学思维 costs $1.99, with no in-app purchases.

### Do 学习成长21天 or 初中数学思维 have ads?

Neither 学习成长21天 nor 初中数学思维 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.*