# 19×19 暗算脳トレ vs CroupierAcademy

The clearest difference is in-app purchases: 19×19 暗算脳トレ at none against CroupierAcademy's 3. 19×19 暗算脳トレ also leads on iOS requirement (13.0 vs 17.0). CroupierAcademy's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. CroupierAcademy sells 3 in-app purchases, starting at $1.99 per 7 days. 19×19 暗算脳トレ asks for nothing beyond the download.

19×19 暗算脳トレ ships an update every 9 days, CroupierAcademy weekly. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 19×19 暗算脳トレ | CroupierAcademy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 9 days | **Weekly** |
| Size | 38 MB | 16 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Atsushi Isai](https://appshunter.io/developer/1881655484) | [FABIANO DE BEI](https://appshunter.io/developer/6789051336) |

## What reviewers say

### 19×19 暗算脳トレ

[App page](https://appshunter.io/ios/app/1919/id6763848289)

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

**In-app purchases:** none


### CroupierAcademy

[App page](https://appshunter.io/ios/app/croupieracademy/id6789060944)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium weekly | $1.99 | per 7 days |
| Premium monthly | $5.99 | per month |
| Premium yearly | $59.99 | per year |


## Frequently asked questions

### Is 19×19 暗算脳トレ free?

19×19 暗算脳トレ is free to download, with no in-app purchases.

### Is CroupierAcademy free?

CroupierAcademy is free to download, with in-app purchases available.

### Do 19×19 暗算脳トレ or CroupierAcademy have ads?

19×19 暗算脳トレ shows ads; CroupierAcademy does not.

### Which is updated more often, 19×19 暗算脳トレ or CroupierAcademy?

19×19 暗算脳トレ ships an update every 9 days, and CroupierAcademy weekly. Most recently, 19×19 暗算脳トレ was updated on October 7, 2026 and CroupierAcademy on October 11, 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.*