SJ Chmod Calculator vs DDM Explorer
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
SJ Chmod Calculator
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SJ Chmod Calculator is a free iOS app designed for system administrators, developers, and Linux/Unix users who need to quickly and accurately calculate, understand, and convert Unix file permissions. With its clear and intuitive interface, the app makes it easy to switch between numeric and symbolic representations of file permissions. SJ Chmod Calculator offers two simple methods to obtain or verify file or directory access rights. First mode: Numeric code input (755, 644, 600, etc.) The user enters a 3-digit chmod value. The app instantly displays: β A permissions table (read, write, execute) for each category: User (owner), Group, Others β The equivalent symbolic notation (e.g., rwxr-xr-x) Second mode: Interactive table input The user simply checks the boxes for read (R), write (W), and execute (X) for each category. The app automatically calculates: β The corresponding numeric chmod value β The Unix symbolic permission string Key features: β Instant conversion between numeric and symbolic notation β Visual table of permissions by category (user, group, others) β Intuitive interface, easy to use β Free application A practical tool for all Linux/Unix users Whether youβre a developer, system administrator, student, or advanced user of Unix/Linux systems, SJ Chmod Calculator helps you manage file permissions quickly and effortlessly.
DDM Explorer
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Jamf DDM Explorer is an app built to help IT administrators learn and understand Appleβs Declarative Device Management framework, allowing users to browse published declaration types compatible for both currently-shipping operating systems, as well as pre-release beta declarations published in available GitHub branches. Use this app for same-day declaration building as soon as documentation is released for available beta operating system versions. Browse and build payloads in a brand-new Declaration Explorer editor for deployment as custom declarations to test devices, and deploy with your device management system for testing. All declaration objects are sourced directly from Appleβs GitHub, allowing for loading pre-release branch documentation, when available. Once declarations are deployed and activated, use the Status Explorer view to view your test deviceβs current declarative status reports, including available status subscriptions. Status documentation is also built in-line with the Status Explorer viewer for reference. Note: Features such as reading a test deviceβs status reports require an integration with Jamf Pro.
Screenshots
Verdict
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.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
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.
| Parameter | SJ Chmod Calculator | DDM Explorer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly β better | Every 2 months |
| Ads | Yes | No β better |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad | iPad, Mac |
| Requires iOS | 16.0 β better | 18.6 |
| Further details β not scored | ||
| Size | 3 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Stephane JAILLIARD | JAMF Software |
In-app purchases
SJ Chmod Calculator
- A coffee$0.99
- A cookie$2.99
- A lemon tart$4.99
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- No ads$4.99
- A pizza$9.99
DDM Explorer
No in-app purchases
Questions
Is SJ Chmod Calculator free?
Is DDM Explorer free?
Do SJ Chmod Calculator or DDM Explorer have ads?
Which is updated more often, SJ Chmod Calculator or DDM Explorer?
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