# プロセス・ディフェンス vs f(x)

The clearest difference is ads: f(x) at none against プロセス・ディフェンス's shown. プロセス・ディフェンス's advantage is update cadence (weekly vs monthly) and iOS requirement (12.0 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.

プロセス・ディフェンス ships an update weekly, f(x) monthly. The most recent releases landed on September 22, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | プロセス・ディフェンス | f(x) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Monthly |
| Size | 81 MB | 77 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Chikai Ito](https://appshunter.io/developer/1480561746) | [Ryo Matsumoto](https://appshunter.io/developer/1725054568) |

## What reviewers say

### プロセス・ディフェンス

[App page](https://appshunter.io/ios/app/id1592811050)

**Features:** macOS Compatibility

**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 プロセス・ディフェンス free?

プロセス・ディフェンス 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 プロセス・ディフェンス or f(x) have ads?

プロセス・ディフェンス shows ads; f(x) does not.

### Which is updated more often, プロセス・ディフェンス or f(x)?

プロセス・ディフェンス ships an update weekly, and f(x) monthly. Most recently, プロセス・ディフェンス was updated on September 22, 2026 and f(x) on September 8, 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.*