# Subtraction App vs 鬼の脳トレ

The clearest difference is in-app purchases: 鬼の脳トレ at none against Subtraction App's 1. 鬼の脳トレ also leads on ads (none vs shown) and iOS requirement (11.0 vs 14.0). On price and device support there is nothing between them.

Both are free to download. Subtraction App sells 1 in-app purchase, starting at $1.99 per month. 鬼の脳トレ asks for nothing beyond the download.

## The numbers

| Metric | Subtraction App | 鬼の脳トレ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | — |
| Size | 26 MB | 77 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) | [walkertest](https://appshunter.io/developer/1691035075) |

## What reviewers say

### Subtraction App

[App page](https://appshunter.io/ios/app/subtraction-app/id1622934481)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per month |


### 鬼の脳トレ

[App page](https://appshunter.io/ios/app/id6475755141)

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

**In-app purchases:** none


## Frequently asked questions

### Is Subtraction App free?

Subtraction App is free to download, with in-app purchases available.

### Is 鬼の脳トレ free?

鬼の脳トレ is free to download, with no in-app purchases.

### Do Subtraction App or 鬼の脳トレ have ads?

Subtraction App shows ads; 鬼の脳トレ 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.*