# 暗算Blitz vs 19×19 暗算脳トレ

The clearest difference is in-app purchases: 19×19 暗算脳トレ at none against 暗算Blitz's 1. 19×19 暗算脳トレ also leads on iOS requirement (13.0 vs 17.6). 暗算Blitz's advantage is update cadence (daily vs every 9 days). On price, ads and device support there is nothing between them.

Both are free to download. 暗算Blitz sells 1 one-off in-app purchase. 19×19 暗算脳トレ asks for nothing beyond the download.

暗算Blitz ships an update daily, 19×19 暗算脳トレ every 9 days. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 暗算Blitz | 19×19 暗算脳トレ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Daily** | Every 9 days |
| Size | 54 MB | 38 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Toshihide KAWAI](https://appshunter.io/developer/1598098272) | [Atsushi Isai](https://appshunter.io/developer/1881655484) |

## What reviewers say

### 暗算Blitz

[App page](https://appshunter.io/ios/app/blitz/id6741730652)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム・ユーザー | $14.99 | one-time |


### 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


## Frequently asked questions

### Is 暗算Blitz free?

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

### 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.

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

Both 暗算Blitz and 19×19 暗算脳トレ show ads.

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

暗算Blitz ships an update daily, and 19×19 暗算脳トレ every 9 days. Most recently, 暗算Blitz was updated on October 3, 2026 and 19×19 暗算脳トレ on October 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.*