# f(x) vs 鬼の脳トレ

The clearest difference is iOS requirement: 鬼の脳トレ at 11.0 against f(x)'s 15.0. 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.

## The numbers

| Metric | f(x) | 鬼の脳トレ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | — |
| Size | 77 MB | 77 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Ryo Matsumoto](https://appshunter.io/developer/1725054568) | [walkertest](https://appshunter.io/developer/1691035075) |

## What reviewers say

### f(x)

[App page](https://appshunter.io/ios/app/fx/id6475749250)

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

**In-app purchases:** none


### 鬼の脳トレ

[App page](https://appshunter.io/ios/app/id6475755141)

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

**In-app purchases:** none


## Frequently asked questions

### Is f(x) free?

f(x) is free to download, with no in-app purchases.

### Is 鬼の脳トレ free?

鬼の脳トレ is free to download, with no in-app purchases.

### Do f(x) or 鬼の脳トレ have ads?

Neither f(x) nor 鬼の脳トレ shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*