# Subtraction Math Master 2 vs 3D記憶力テスト～脳トレ・認知症予防アプリ

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 Math Master 2's 1. Subtraction Math Master 2's advantage is ads (none vs shown) and iOS requirement (8.0 vs 12.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Subtraction Math Master 2 sells 1 one-off in-app purchase. 3D記憶力テスト～脳トレ・認知症予防アプリ asks for nothing beyond the download.

Subtraction Math Master 2 ships an update every 34 months, 3D記憶力テスト～脳トレ・認知症予防アプリ every 29 months. The most recent releases landed on September 21, 2026 and March 21, 2026 respectively.

## The numbers

| Metric | Subtraction Math Master 2 | 3D記憶力テスト～脳トレ・認知症予防アプリ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (2 ratings)](https://appshunter.io/ios/app/subtraction-math-master-2/id806133567/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 34 months | **Every 29 months** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 199 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Peter Li](https://appshunter.io/developer/424298074) | [Takuma Takahashi](https://appshunter.io/developer/1514411811) |

## What reviewers say

### Subtraction Math Master 2

[App page](https://appshunter.io/ios/app/subtraction-math-master-2/id806133567)

This game challenges players to improve their subtraction speed and mental math skills. It features a "LEVEL UP" system that increases difficulty with correct answers and includes leaderboards and achievements for competitive play.

**Highlights:** 2-minute subtraction games, LEVEL UP difficulty system, Leaderboards and achievements, Intuitive user interface, Share results globally

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| REMOVE ADS (Subtraction 2) | $0.99 | one-time |


### 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


## Frequently asked questions

### Is Subtraction Math Master 2 free?

Subtraction Math Master 2 is free to download, with in-app purchases available.

### 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.

### Do Subtraction Math Master 2 or 3D記憶力テスト～脳トレ・認知症予防アプリ have ads?

3D記憶力テスト～脳トレ・認知症予防アプリ shows ads; Subtraction Math Master 2 does not.

### Which is updated more often, Subtraction Math Master 2 or 3D記憶力テスト～脳トレ・認知症予防アプリ?

Subtraction Math Master 2 ships an update every 34 months, and 3D記憶力テスト～脳トレ・認知症予防アプリ every 29 months. Most recently, Subtraction Math Master 2 was updated on September 21, 2026 and 3D記憶力テスト～脳トレ・認知症予防アプリ on March 21, 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.*