# SJ Chmod Calculator vs DDM Explorer

The clearest difference is in-app purchases: DDM Explorer at none against SJ Chmod Calculator's 5. DDM Explorer also leads on ads (none vs shown). SJ Chmod Calculator's advantage is update cadence (weekly vs every 2 months) and iOS requirement (16.0 vs 18.6). 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. DDM Explorer asks for nothing beyond the download.

SJ Chmod Calculator ships an update weekly, DDM Explorer every 2 months. The most recent releases landed on October 9, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SJ Chmod Calculator | DDM Explorer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 2 months |
| Size | 3 MB | 7 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | iPhone, iPad | iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Stephane JAILLIARD](https://appshunter.io/developer/1749751077) | [JAMF Software](https://appshunter.io/developer/290965542) |

## What reviewers say

### 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 |


### DDM Explorer

[App page](https://appshunter.io/ios/app/ddm-explorer/id6754861743)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SJ Chmod Calculator free?

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

### Is DDM Explorer free?

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

### Do SJ Chmod Calculator or DDM Explorer have ads?

SJ Chmod Calculator shows ads; DDM Explorer does not.

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

SJ Chmod Calculator ships an update weekly, and DDM Explorer every 2 months. Most recently, SJ Chmod Calculator was updated on October 9, 2026 and DDM Explorer 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.*