# Simple Flash Mental Arithmetic vs 決闘勇者　ハロルドカードゲームＥＸ

The clearest difference is update cadence: 決闘勇者　ハロルドカードゲームＥＸ at every 5 days against Simple Flash Mental Arithmetic's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Simple Flash Mental Arithmetic ships an update every 2 months, 決闘勇者　ハロルドカードゲームＥＸ every 5 days. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Simple Flash Mental Arithmetic | 決闘勇者　ハロルドカードゲームＥＸ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Ad-supported | — |
| Size | 21 MB | 69 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Takeda](https://appshunter.io/developer/1021096508) | [Satoru Higuchi](https://appshunter.io/developer/1114844580) |

## What reviewers say

### Simple Flash Mental Arithmetic

[App page](https://appshunter.io/ios/app/simple-flash-mental-arithmetic/id1022200948)

Practice mental math with this application. Choose from various difficulty levels to train your arithmetic skills or engage in brain exercises for anti-aging. It's a straightforward tool for improving calculation speed and accuracy.

**Highlights:** Adjustable difficulty levels, Mental arithmetic training, Anti-aging brain exercises, Suitable for all skill levels

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

**In-app purchases:** none


### 決闘勇者　ハロルドカードゲームＥＸ

[App page](https://appshunter.io/ios/app/id6445859038)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Simple Flash Mental Arithmetic free?

Simple Flash Mental Arithmetic is free to download, with no in-app purchases.

### Is 決闘勇者　ハロルドカードゲームＥＸ free?

決闘勇者　ハロルドカードゲームＥＸ is free to download, with no in-app purchases.

### Do Simple Flash Mental Arithmetic or 決闘勇者　ハロルドカードゲームＥＸ have ads?

Both Simple Flash Mental Arithmetic and 決闘勇者　ハロルドカードゲームＥＸ show ads.

### Which is updated more often, Simple Flash Mental Arithmetic or 決闘勇者　ハロルドカードゲームＥＸ?

Simple Flash Mental Arithmetic ships an update every 2 months, and 決闘勇者　ハロルドカードゲームＥＸ every 5 days. Most recently, Simple Flash Mental Arithmetic was updated on October 13, 2026 and 決闘勇者　ハロルドカードゲームＥＸ on October 25, 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.*