# シンプルFLASH暗算 vs Mental Math Kingdom

The clearest difference is in-app purchases: シンプルFLASH暗算 at none against Mental Math Kingdom's 1. シンプルFLASH暗算 also leads on device support (3 vs 1) and iOS requirement (15.6 vs 17.0). Mental Math Kingdom's advantage is ads (none vs shown) and update cadence (daily vs fortnightly). On price there is nothing between them.

Both are free to download. Mental Math Kingdom sells 1 one-off in-app purchase. シンプルFLASH暗算 asks for nothing beyond the download.

シンプルFLASH暗算 ships an update fortnightly, Mental Math Kingdom daily. The most recent releases landed on November 8, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | シンプルFLASH暗算 | Mental Math Kingdom |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Daily** |
| Size | 4 MB | 13 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TSUKASA YONAHA](https://appshunter.io/developer/1835823966) | [Hiroki Sekimoto](https://appshunter.io/developer/1877884860) |

## What reviewers say

### シンプルFLASH暗算

[App page](https://appshunter.io/ios/app/flash/id6751562239)

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

**In-app purchases:** none


### Mental Math Kingdom

[App page](https://appshunter.io/ios/app/mental-math-kingdom/id6787438808)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mental Math Kingdom Pro | $3.99 | one-time |


## Frequently asked questions

### Is シンプルFLASH暗算 free?

シンプルFLASH暗算 is free to download, with no in-app purchases.

### Is Mental Math Kingdom free?

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

### Do シンプルFLASH暗算 or Mental Math Kingdom have ads?

シンプルFLASH暗算 shows ads; Mental Math Kingdom does not.

### Which is updated more often, シンプルFLASH暗算 or Mental Math Kingdom?

シンプルFLASH暗算 ships an update fortnightly, and Mental Math Kingdom daily. Most recently, シンプルFLASH暗算 was updated on November 8, 2026 and Mental Math Kingdom on November 10, 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.*