# chmod util vs ɹǝddoH

The clearest difference is update cadence: ɹǝddoH at every 3 weeks against chmod util's every 63 months. 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.

chmod util ships an update every 63 months, ɹǝddoH every 3 weeks. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | chmod util | ɹǝddoH |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 63 months | **Every 3 weeks** |
| Size | 2 MB | 17 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mattia Righetti](https://appshunter.io/developer/1513841416) | [AENGIX S.L.](https://appshunter.io/developer/1895619438) |

## What reviewers say

### chmod util

[App page](https://appshunter.io/ios/app/chmod-util/id1581290826)

**Features:** Vision Pro support

**In-app purchases:** none


### ɹǝddoH

[App page](https://appshunter.io/ios/app/ddoh/id6778506930)

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

**In-app purchases:** none


## Frequently asked questions

### Is chmod util free?

chmod util is free to download, with no in-app purchases.

### Is ɹǝddoH free?

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

### Do chmod util or ɹǝddoH have ads?

Neither chmod util nor ɹǝddoH shows ads.

### Which is updated more often, chmod util or ɹǝddoH?

chmod util ships an update every 63 months, and ɹǝddoH every 3 weeks. Most recently, chmod util was updated on October 24, 2026 and ɹǝddoH on October 15, 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.*