# Flash mental calculation vs フラッシュ暗算練習

The clearest difference is review sentiment: Flash mental calculation at 100% against フラッシュ暗算練習's 50%. フラッシュ暗算練習's advantage is in-app purchases (none vs 1) and update cadence (every 9 days vs every 5 months). On price, ads and device support there is nothing between them.

Both are free to download. Flash mental calculation sells 1 one-off in-app purchase. フラッシュ暗算練習 asks for nothing beyond the download.

Flash mental calculation ships an update every 5 months, フラッシュ暗算練習 every 9 days. The most recent releases landed on October 17, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Flash mental calculation | フラッシュ暗算練習 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/flash-mental-calculation/id1224937523/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 28 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [kenji kiuchi](https://appshunter.io/developer/553473005) | [Katsuyuki Hayashi](https://appshunter.io/developer/1597263179) |

## What reviewers say

### Flash mental calculation

[App page](https://appshunter.io/ios/app/flash-mental-calculation/id1224937523)

Practice mental arithmetic with this educational app. Review your calculation process, and easily re-challenge mistaken problems from your past logs. Upgrade to save more calculation history.

**Highlights:** Practice flash mental arithmetic, Review calculation process, Rechallenge mistaken problems, Save past calculation logs, Log history saved after purchase

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove AD & All function Release. | $9.99 | one-time |


### 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


## Frequently asked questions

### Is Flash mental calculation free?

Flash mental calculation is free to download, with in-app purchases available.

### 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.

### Do Flash mental calculation or フラッシュ暗算練習 have ads?

Both Flash mental calculation and フラッシュ暗算練習 show ads.

### Which is updated more often, Flash mental calculation or フラッシュ暗算練習?

Flash mental calculation ships an update every 5 months, and フラッシュ暗算練習 every 9 days. Most recently, Flash mental calculation was updated on October 17, 2026 and フラッシュ暗算練習 on October 9, 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.*