# 3D記憶力テスト～脳トレ・認知症予防アプリ vs Subtraction App

The clearest difference is in-app purchases: 3D記憶力テスト～脳トレ・認知症予防アプリ at none against Subtraction App's 1. 3D記憶力テスト～脳トレ・認知症予防アプリ also leads on iOS requirement (12.0 vs 14.0). Subtraction App's advantage is update cadence (every 2 weeks vs every 29 months). On price, ads 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. 3D記憶力テスト～脳トレ・認知症予防アプリ asks for nothing beyond the download.

3D記憶力テスト～脳トレ・認知症予防アプリ ships an update every 29 months, Subtraction App every 2 weeks. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | 3D記憶力テスト～脳トレ・認知症予防アプリ | Subtraction App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 29 months | **Every 2 weeks** |
| Size | 199 MB | 26 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takuma Takahashi](https://appshunter.io/developer/1514411811) | [Foodmenu.world Inc.](https://appshunter.io/developer/1438351063) |

## What reviewers say

### 3D記憶力テスト～脳トレ・認知症予防アプリ

[App page](https://appshunter.io/ios/app/3d/id1528475226)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 3D記憶力テスト～脳トレ・認知症予防アプリ free?

3D記憶力テスト～脳トレ・認知症予防アプリ is free to download, with no in-app purchases.

### Is Subtraction App free?

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

### Do 3D記憶力テスト～脳トレ・認知症予防アプリ or Subtraction App have ads?

Both 3D記憶力テスト～脳トレ・認知症予防アプリ and Subtraction App show ads.

### Which is updated more often, 3D記憶力テスト～脳トレ・認知症予防アプリ or Subtraction App?

3D記憶力テスト～脳トレ・認知症予防アプリ ships an update every 29 months, and Subtraction App every 2 weeks. Most recently, 3D記憶力テスト～脳トレ・認知症予防アプリ was updated on November 3, 2026 and Subtraction App on November 12, 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.*