# Flash mental calculation vs Anzan19x19

The clearest difference is in-app purchases: Anzan19x19 at none against Flash mental calculation's 1. Anzan19x19 also leads on update cadence (every 3 days vs every 5 months) and iOS requirement (12.0 vs 15.6). 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. Anzan19x19 asks for nothing beyond the download.

Flash mental calculation ships an update every 5 months, Anzan19x19 every 3 days. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Flash mental calculation | Anzan19x19 |
| --- | --- | --- |
| 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 | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 11 MB | 38 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [kenji kiuchi](https://appshunter.io/developer/553473005) | [Hajime Hotaka](https://appshunter.io/developer/1495063369) |

## 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 |


### Anzan19x19

[App page](https://appshunter.io/ios/app/anzan19x19/id1495063370)

**Features:** macOS Compatibility

**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 Anzan19x19 free?

Anzan19x19 is free to download, with no in-app purchases.

### Do Flash mental calculation or Anzan19x19 have ads?

Both Flash mental calculation and Anzan19x19 show ads.

### Which is updated more often, Flash mental calculation or Anzan19x19?

Flash mental calculation ships an update every 5 months, and Anzan19x19 every 3 days. Most recently, Flash mental calculation was updated on November 6, 2026 and Anzan19x19 on November 7, 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.*