# ARSA ENIGMA vs Cat CPU System

The clearest difference is update cadence: ARSA ENIGMA at every 3 days against Cat CPU System's weekly. ARSA ENIGMA also leads on iOS requirement (12.0 vs 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.

ARSA ENIGMA ships an update every 3 days, Cat CPU System weekly. The most recent releases landed on October 8, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | ARSA ENIGMA | Cat CPU System |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Free | — |
| Size | 20 MB | 39 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Arsa Tangchitsomkit](https://appshunter.io/developer/908885655) | [Brook Design, LLC](https://appshunter.io/developer/1190785004) |

## What reviewers say

### ARSA ENIGMA

[App page](https://appshunter.io/ios/app/arsa-enigma/id6504475118)

Securely encrypt and decrypt files for private sharing. Protect your data from leaks, fraud, and scams with this utility app. It offers multiple encryption levels for varying device capabilities.

**Highlights:** File encryption, File decryption, Secure data sharing, Private key management, Bilinear encryption (2 layers), Trilinear encryption (3 layers)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cat CPU System

[App page](https://appshunter.io/ios/app/cat-cpu-system/id6695728672)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ARSA ENIGMA free?

ARSA ENIGMA is free to download, with no in-app purchases.

### Is Cat CPU System free?

Cat CPU System is free to download, with no in-app purchases.

### Do ARSA ENIGMA or Cat CPU System have ads?

Neither ARSA ENIGMA nor Cat CPU System shows ads.

### Which is updated more often, ARSA ENIGMA or Cat CPU System?

ARSA ENIGMA ships an update every 3 days, and Cat CPU System weekly. Most recently, ARSA ENIGMA was updated on October 8, 2026 and Cat CPU System on October 3, 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.*