# 暗算 vs Mental Math for Work

The clearest difference is in-app purchases: 暗算 at none against Mental Math for Work's 2. 暗算 also leads on iOS requirement (16.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Mental Math for Work sells 2 in-app purchases, starting at $1.99 per month. 暗算 asks for nothing beyond the download.

## The numbers

| Metric | 暗算 | Mental Math for Work |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 9 days |
| Size | 19 MB | 15 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [otsuki hayato](https://appshunter.io/developer/1828600192) | [Shota Morioka](https://appshunter.io/developer/483674380) |

## What reviewers say

### 暗算

[App page](https://appshunter.io/ios/app/id6766406251)

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

**In-app purchases:** none


### Mental Math for Work

[App page](https://appshunter.io/ios/app/mental-math-for-work/id6766879948)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Premium Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is 暗算 free?

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

### Is Mental Math for Work free?

Mental Math for Work is free to download, with in-app purchases available.

### Do 暗算 or Mental Math for Work have ads?

Neither 暗算 nor Mental Math for Work 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.*