# フラッシュ暗算（公式） vs Flash Mental Math (Anzan)

The clearest difference is price: Flash Mental Math (Anzan) at Free against フラッシュ暗算（公式）'s $3.99. Flash Mental Math (Anzan) also leads on review sentiment (100% vs 57%) and rating (5.0 vs 2.0). フラッシュ暗算（公式）'s advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Flash Mental Math (Anzan) is free to download; フラッシュ暗算（公式） costs $3.99 up front. Flash Mental Math (Anzan) sells 1 in-app purchase, starting at $0.99 per month. フラッシュ暗算（公式） asks for nothing beyond the download.

Flash Mental Math (Anzan) holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 57% of フラッシュ暗算（公式）'s written reviews are positive against 100% of Flash Mental Math (Anzan)'s.

フラッシュ暗算（公式） ships an update every 15 months, Flash Mental Math (Anzan) every 10 days. The most recent releases landed on November 10, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | フラッシュ暗算（公式） | Flash Mental Math (Anzan) |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/id421826349/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/flash-mental-math-anzan/id6749636736/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 57.1% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 15 months | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 54 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yuji Miyamoto](https://appshunter.io/developer/417390646) | [SIC Company Limited](https://appshunter.io/developer/1800842356) |

## What reviewers say

### フラッシュ暗算（公式）

[App page](https://appshunter.io/ios/app/id421826349)

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

**In-app purchases:** none


### Flash Mental Math (Anzan)

[App page](https://appshunter.io/ios/app/flash-mental-math-anzan/id6749636736)

This app helps users of all ages improve their mental math and calculation speed. Numbers flash on screen briefly, training quick thinking and concentration. It's ideal for children preparing for abacus certification, students needing math test prep, or adults seeking brain training.

**Highlights:** Flash number display for quick thinking, Adjustable difficulty levels, Global and classroom rankings, No account registration required, Supports multiple languages, Intuitive interface for children

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |


## Frequently asked questions

### Is フラッシュ暗算（公式） free?

フラッシュ暗算（公式） costs $3.99, with no in-app purchases.

### Is Flash Mental Math (Anzan) free?

Flash Mental Math (Anzan) is free to download, with in-app purchases available.

### Which has better reviews, フラッシュ暗算（公式） or Flash Mental Math (Anzan)?

Flash Mental Math (Anzan) is rated higher. フラッシュ暗算（公式） averages 2.0 out of 5 from 1 ratings, while Flash Mental Math (Anzan) averages 5.0 from 3 ratings.

### Do フラッシュ暗算（公式） or Flash Mental Math (Anzan) have ads?

Flash Mental Math (Anzan) shows ads; フラッシュ暗算（公式） does not.

### Which is updated more often, フラッシュ暗算（公式） or Flash Mental Math (Anzan)?

フラッシュ暗算（公式） ships an update every 15 months, and Flash Mental Math (Anzan) every 10 days. Most recently, フラッシュ暗算（公式） was updated on November 10, 2026 and Flash Mental Math (Anzan) on November 5, 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.*