# フラッシュ暗算練習 vs Brain teaser calculator

The clearest difference is iOS requirement: フラッシュ暗算練習 at 13.0 against Brain teaser calculator's 15.8.3. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

フラッシュ暗算練習 ships an update every 9 days, Brain teaser calculator every 2 weeks. The most recent releases landed on October 9, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | フラッシュ暗算練習 | Brain teaser calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 28 MB | 36 MB |
| Requires iOS | **13.0** | 15.8.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Katsuyuki Hayashi](https://appshunter.io/developer/1597263179) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### フラッシュ暗算練習

[App page](https://appshunter.io/ios/app/id6477322637)

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

**In-app purchases:** none


### Brain teaser calculator

[App page](https://appshunter.io/ios/app/brain-teaser-calculator/id6499087643)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is フラッシュ暗算練習 free?

フラッシュ暗算練習 is free to download, with no in-app purchases.

### Is Brain teaser calculator free?

Brain teaser calculator is free to download, with no in-app purchases.

### Do フラッシュ暗算練習 or Brain teaser calculator have ads?

Both フラッシュ暗算練習 and Brain teaser calculator show ads.

### Which is updated more often, フラッシュ暗算練習 or Brain teaser calculator?

フラッシュ暗算練習 ships an update every 9 days, and Brain teaser calculator every 2 weeks. Most recently, フラッシュ暗算練習 was updated on October 9, 2026 and Brain teaser calculator on October 18, 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.*