Chmod Toolkit

Master permissions & cert prep

Free · In-App Purchases

Ready for iPhone Duo and the current Linux+ exam. Miss a question and ChmodIQ shows what your answer would do, bit by bit. The deepest permissions study tool anywhere. The most comprehensive Unix permissions learning tool available on any platform. Master chmod, chown, umask, ACLs, SELinux, and everything in between, then prove you know it under real exam conditions. Whether you're preparing for a Linux certification exam, hardening production servers, or learning Unix for the first time, Chmod Toolkit gives you the knowledge, the practice, and the proof. SIMULATE REAL CERTIFICATION EXAMS Three cert-specific exam modes that match actual exam methodology. Linux+ simulation: 90 questions, 90-minute timer, scaled scoring to 720/900. LPIC-1: 60 questions with fill-in-the-blank, 90 minutes, scored to 500/800. RHCSA: 18 hands-on tasks, 3 hours, reference materials available, just like the real exam. Skip, flag, and return to any question. Domain-by-domain results tell you exactly where to improve. READY FOR iPHONE DUO Every screen lays out for the inner display, in any orientation, and keeps its place through a fold. Prop the phone open and Flashcards settle on either side of the crease. MASTER PERMISSIONS, NOT JUST MEMORIZE THEM Spaced repetition tracks what you actually know, not what you crammed yesterday. Reviews are scheduled based on your accuracy, spending time where it matters most. Eight question types keep you sharp: multiple choice, type the octal, symbolic conversion, true/false, scenarios, fill-in-the-blank, typed commands, and multi-step task planning. Get an answer wrong and ChmodIQ shows exactly what your answer would do, bit by bit, next to the right one. PREPARE BY EXAM DOMAIN Study by exam domain for CompTIA Linux+ (XK0-006), LPIC-1, and RHCSA. Every question maps to specific exam objectives so you know exactly what you're covering. Domain-by-domain progress tracking tells you when you're ready to test, and where to focus when you're not. SEE YOUR GROWTH A full stats dashboard with interactive charts shows your accuracy trends, category strengths, question type breakdown, difficulty performance, and certification readiness. Triple progress rings, daily challenge streaks, and engagement metrics give you the complete picture. A COMPLETE MASTERY SYSTEM Learn the concepts with structured study topics. Practice with quizzes and daily challenges. Reinforce with flashcards that surface questions you've already attempted. Track your readiness with the stats dashboard. Prove it with exam simulation. Calculate permissions instantly, scan for security issues, and diagnose errors, all on-device. Every feature serves one goal: mastery. BUILT FOR EVERY APPLE DEVICE iPhone with haptic feedback and sound effects. iPad with full-screen layouts and split view. Mac with native sidebar navigation, keyboard shortcuts, and drag-and-drop folder scanning. iCloud syncs your progress across all your devices automatically. One purchase. No subscription. Every future update included. No account required. No data leaves your device. Your progress, your privacy.

Events

Ratings & Reviews

  • This app has not received enough ratings or reviews to display an overview.

Ready for iPhone Duo. • Built for iPhone Duo: every screen lays out for the inner display, in any orientation, and keeps its place through a fold. Fold the phone halfway and Flashcards settle on either side of the crease. • Sharper quiz feedback: get an answer wrong and ChmodIQ shows exactly what your answer would do, bit by bit, next to the right one. • Ready for Linux+ XK0-006: objectives updated for the current exam, plus new questions on symbolic modes, special bits, SELinux and password aging. • Fixes and polish throughout.

Version 3.4

The developer, Robert Frederique, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Size
    33.1 MB
    Category
    Developer Tools
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    Provider
    Robert Frederique
    • Robert Frederique has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
    • Address
      Po Box 842
      Raleigh North Carolina 27529
      United States
    • Phone Number
      +1 9197527340
    • Email
      contact@starphenomenon.com
    Copyright
    © 2025-2026 Robert Frederique
  • Developer Website
  • Privacy Policy

    • More by Robert Frederique

    You Might Also Like