# Missing Num vs 19×19 暗算脳トレ

The clearest difference is update cadence: 19×19 暗算脳トレ at every 9 days against Missing Num's every 11 months. 19×19 暗算脳トレ also leads on iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Missing Num ships an update every 11 months, 19×19 暗算脳トレ every 9 days. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Missing Num | 19×19 暗算脳トレ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 11 months | **Every 9 days** |
| Size | 8 MB | 38 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [Atsushi Isai](https://appshunter.io/developer/1881655484) |

## What reviewers say

### Missing Num

[App page](https://appshunter.io/ios/app/missing-num/id868026877)

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

**In-app purchases:** none


### 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 Missing Num free?

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

### 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 Missing Num or 19×19 暗算脳トレ have ads?

Both Missing Num and 19×19 暗算脳トレ show ads.

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

Missing Num ships an update every 11 months, and 19×19 暗算脳トレ every 9 days. Most recently, Missing Num was updated on October 29, 2026 and 19×19 暗算脳トレ on October 28, 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.*