# N'Back Fan 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 N'Back Fan's 1. 19×19 暗算脳トレ also leads on update cadence (every 9 days vs every 9 months) and iOS requirement (13.0 vs 15.6). On price, ads and device support there is nothing between them.

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

N'Back Fan ships an update every 9 months, 19×19 暗算脳トレ every 9 days. The most recent releases landed on September 30, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | N'Back Fan | 19×19 暗算脳トレ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 9 months | **Every 9 days** |
| Size | 7 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

### N'Back Fan

[App page](https://appshunter.io/ios/app/nback-fan/id6449070102)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| remove ads and extend to 12 | $1.99 | 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 N'Back Fan free?

N'Back Fan 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 N'Back Fan or 19×19 暗算脳トレ have ads?

Both N'Back Fan and 19×19 暗算脳トレ show ads.

### Which is updated more often, N'Back Fan or 19×19 暗算脳トレ?

N'Back Fan ships an update every 9 months, and 19×19 暗算脳トレ every 9 days. Most recently, N'Back Fan was updated on September 30, 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.*