# フラッシュ計算 vs Abacus Practice

The clearest difference is price: フラッシュ計算 at Free against Abacus Practice's $0.99. フラッシュ計算 also leads on in-app purchases (none vs 1) and iOS requirement (11.0 vs 17.0). Abacus Practice's advantage is ads (none vs shown) and update cadence (every 4 months vs every 14 months). On device support there is nothing between them.

フラッシュ計算 is free to download; Abacus Practice costs $0.99 up front. Abacus Practice sells 1 one-off in-app purchase. フラッシュ計算 asks for nothing beyond the download.

フラッシュ計算 ships an update every 14 months, Abacus Practice every 4 months. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | フラッシュ計算 | Abacus Practice |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 14 months | **Every 4 months** |
| Monetization | — | Free with in-app purchases |
| Size | 52 MB | 18 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [hideaki fukumura](https://appshunter.io/developer/1629984757) | [SMART BIT K.K](https://appshunter.io/developer/1896559487) |

## What reviewers say

### フラッシュ計算

[App page](https://appshunter.io/ios/app/id1637786591)

**Features:** macOS Compatibility

**In-app purchases:** none


### Abacus Practice

[App page](https://appshunter.io/ios/app/abacus-practice-mental-math/id6770438521)

Practice abacus, mental arithmetic, and calculation skills on your iPhone or iPad. Features a realistic abacus interface for various exercises, including addition, subtraction, multiplication, division, and flash calculations. Track your progress and review your performance over time.

**Highlights:** Realistic abacus interface, Practice addition, subtraction, multiplication, division, Flash and slip calculations, Customizable problem generation, Practice history and performance records, Adjustable settings for sound, vibration, and left-handed mode

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is フラッシュ計算 free?

フラッシュ計算 is free to download, with no in-app purchases.

### Is Abacus Practice free?

Abacus Practice costs $0.99, and also offers in-app purchases.

### Do フラッシュ計算 or Abacus Practice have ads?

フラッシュ計算 shows ads; Abacus Practice does not.

### Which is updated more often, フラッシュ計算 or Abacus Practice?

フラッシュ計算 ships an update every 14 months, and Abacus Practice every 4 months. Most recently, フラッシュ計算 was updated on October 27, 2026 and Abacus Practice 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.*