# フラッシュ暗算（公式） vs How Math Works

The clearest difference is price: How Math Works at Free against フラッシュ暗算（公式）'s $3.99. How Math Works also leads on update cadence (every 6 days vs every 15 months). フラッシュ暗算（公式）'s advantage is in-app purchases (none vs 1) and iOS requirement (7.0 vs 15.0). On ads and device support there is nothing between them.

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

フラッシュ暗算（公式） ships an update every 15 months, How Math Works every 6 days. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | フラッシュ暗算（公式） | How Math Works |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/id421826349/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 6 days** |
| Size | 2 MB | 29 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) | [Tsuyoshi Chujo](https://appshunter.io/developer/1481316741) |

## 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


### How Math Works

[App page](https://appshunter.io/ios/app/how-math-works/id6787864882)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan (Monthly) | $3.99 | 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 How Math Works free?

How Math Works is free to download, with in-app purchases available.

### Do フラッシュ暗算（公式） or How Math Works have ads?

Neither フラッシュ暗算（公式） nor How Math Works shows ads.

### Which is updated more often, フラッシュ暗算（公式） or How Math Works?

フラッシュ暗算（公式） ships an update every 15 months, and How Math Works every 6 days. Most recently, フラッシュ暗算（公式） was updated on October 26, 2026 and How Math Works 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.*