Comparison

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.

Head to head
About

SJ Chmod Calculator

Features
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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: – A permissions table (read, write, execute) for each category: User (owner), Group, Others – 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: – The corresponding numeric chmod value – The Unix symbolic permission string Key features: – Instant conversion between numeric and symbolic notation – Visual table of permissions by category (user, group, others) – Intuitive interface, easy to use – Free application A practical tool for all Linux/Unix users Whether you’re a developer, system administrator, student, or advanced user of Unix/Linux systems, SJ Chmod Calculator helps you manage file permissions quickly and effortlessly.

About

DDM Explorer

Features
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Jamf DDM Explorer is an app built to help IT administrators learn and understand Apple’s 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 Apple’s 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 device’s 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 device’s status reports require an integration with Jamf Pro.

Screenshots

SJ Chmod Calculator3 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

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.

Scorecard4 real differences Β· 2 level
SJ Chmod Calculator versus DDM Explorer: the parameters behind the verdict, then further details
ParameterSJ Chmod CalculatorDDM Explorer
PriceFreeFree
Update frequencyWeekly β€” betterEvery 2 months
AdsYesNo β€” better
In-app purchasesYesNo β€” better
DevicesiPhone, iPadiPad, Mac
Requires iOS16.0 β€” better18.6
Further details β€” not scored
Size3 MB7 MB
Age rating4+4+
DeveloperStephane JAILLIARDJAMF Software

In-app purchases

5 purchases

SJ Chmod Calculator

One-time5
  • A coffee$0.99
  • A cookie$2.99
  • A lemon tart$4.99
Show 2 more
  • No ads$4.99
  • A pizza$9.99
None

DDM Explorer

No in-app purchases

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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