# π(円周率)記憶ゲーム vs f(x)

The clearest difference is ads: f(x) at none against π(円周率)記憶ゲーム's shown. f(x) also leads on update cadence (monthly vs every 3 months). π(円周率)記憶ゲーム's advantage is iOS requirement (11.0 vs 15.0). On price, 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.

π(円周率)記憶ゲーム ships an update every 3 months, f(x) monthly. Both last shipped on October 25, 2026.

## The numbers

| Metric | π(円周率)記憶ゲーム | f(x) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Monthly** |
| Size | 62 MB | 77 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Garhi Japan K.K.](https://appshunter.io/developer/1444709284) | [Ryo Matsumoto](https://appshunter.io/developer/1725054568) |

## What reviewers say

### π(円周率)記憶ゲーム

[App page](https://appshunter.io/ios/app/id1636996175)

**In-app purchases:** none


### f(x)

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

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

**In-app purchases:** none


## Frequently asked questions

### Is π(円周率)記憶ゲーム free?

π(円周率)記憶ゲーム is free to download, with no in-app purchases.

### Is f(x) free?

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

### Do π(円周率)記憶ゲーム or f(x) have ads?

π(円周率)記憶ゲーム shows ads; f(x) does not.

### Which is updated more often, π(円周率)記憶ゲーム or f(x)?

π(円周率)記憶ゲーム ships an update every 3 months, and f(x) monthly. Most recently, π(円周率)記憶ゲーム was updated on October 25, 2026 and f(x) on October 25, 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.*