# フラッシュ暗算検定模試（協会） vs How Math Works

The clearest difference is price: How Math Works at Free against フラッシュ暗算検定模試（協会）'s $3.99. How Math Works also leads on update cadence (every 6 days vs every 28 months). フラッシュ暗算検定模試（協会）'s advantage is in-app purchases (none vs 1) and iOS requirement (8.0 vs 15.0). On ads and device support there is nothing between them.

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

フラッシュ暗算検定模試（協会） ships an update every 28 months, How Math Works every 6 days. The most recent releases landed on October 18, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | フラッシュ暗算検定模試（協会） | How Math Works |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/id879920206/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 6 days** |
| Size | 15 MB | 29 MB |
| Requires iOS | **8.0** | 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

### フラッシュ暗算検定模試（協会）

[App page](https://appshunter.io/ios/app/id879920206)

**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 フラッシュ暗算検定模試（協会） free?

フラッシュ暗算検定模試（協会） 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 フラッシュ暗算検定模試（協会） or How Math Works have ads?

Neither フラッシュ暗算検定模試（協会） nor How Math Works shows ads.

### Which is updated more often, フラッシュ暗算検定模試（協会） or How Math Works?

フラッシュ暗算検定模試（協会） ships an update every 28 months, and How Math Works every 6 days. Most recently, フラッシュ暗算検定模試（協会） was updated on October 18, 2026 and How Math Works on October 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*