# Mental Arithmetic Challenge vs 加减法

The clearest difference is in-app purchases: Mental Arithmetic Challenge at none against 加减法's 3. Mental Arithmetic Challenge also leads on ads (none vs shown) and iOS requirement (9.0 vs 13.0). On price and device support there is nothing between them.

Both are free to download. 加减法 sells 3 one-off in-app purchases. Mental Arithmetic Challenge asks for nothing beyond the download.

## The numbers

| Metric | Mental Arithmetic Challenge | 加减法 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Monthly |
| Size | 34 MB | 17 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zhuhai Record Yi Technology Co.,Ltd.](https://appshunter.io/developer/1638483191) | [杭州家之馨电子商务有限公司](https://appshunter.io/developer/1641228139) |

## What reviewers say

### Mental Arithmetic Challenge

[App page](https://appshunter.io/ios/app/mental-arithmetic-challenge/id1668985552)

**Features:** macOS Compatibility

**In-app purchases:** none


### 加减法

[App page](https://appshunter.io/ios/app/id6449480332)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $4.99 | one-time |
| 半年会员 | $7.99 | one-time |
| 年度会员 | $11.99 | one-time |


## Frequently asked questions

### Is Mental Arithmetic Challenge free?

Mental Arithmetic Challenge is free to download, with no in-app purchases.

### Is 加减法 free?

加减法 is free to download, with in-app purchases available.

### Do Mental Arithmetic Challenge or 加减法 have ads?

加减法 shows ads; Mental Arithmetic Challenge does not.

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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.*