# chmod vs SJ Chmod Calculator

The clearest difference is in-app purchases: chmod at none against SJ Chmod Calculator's 5. chmod also leads on ads (none vs shown) and iOS requirement (8.2 vs 16.0). SJ Chmod Calculator's advantage is update cadence (weekly vs every 5 months). On price and device support there is nothing between them.

Both are free to download. SJ Chmod Calculator sells 5 one-off in-app purchases. chmod asks for nothing beyond the download.

chmod ships an update every 5 months, SJ Chmod Calculator weekly. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | chmod | SJ Chmod Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chmod-fu/id927838132/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | Free | — |
| Size | 10 MB | 3 MB |
| Requires iOS | **8.2** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Red Shark AB](https://appshunter.io/developer/927838131) | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) |

## What reviewers say

### chmod

[App page](https://appshunter.io/ios/app/chmod-fu/id927838132)

This app helps you understand and master the 'chmod' command by easily deciphering octal values. Choose to click individual bits or select octal values to learn file permissions.

**Highlights:** Decipher octal values, Learn file permissions, User-friendly interface, Click individual bits, Select octal values

**Features:** macOS Compatibility

**In-app purchases:** none


### SJ Chmod Calculator

[App page](https://appshunter.io/ios/app/sj-chmod-calculator/id6504128434)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A coffee | $0.99 | one-time |
| A cookie | $2.99 | one-time |
| A lemon tart | $4.99 | one-time |
| No ads | $4.99 | one-time |
| A pizza | $9.99 | one-time |


## Frequently asked questions

### Is chmod free?

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

### Is SJ Chmod Calculator free?

SJ Chmod Calculator is free to download, with in-app purchases available.

### Do chmod or SJ Chmod Calculator have ads?

SJ Chmod Calculator shows ads; chmod does not.

### Which is updated more often, chmod or SJ Chmod Calculator?

chmod ships an update every 5 months, and SJ Chmod Calculator weekly. Most recently, chmod was updated on October 13, 2026 and SJ Chmod Calculator on October 9, 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.*