# Chmod Toolkit — Scan & fix file permissions

> Comprehensive Unix permissions learning and certification exam simulator. (iPhone/iPad app by Robert Frederique.)

- Source: https://appshunter.io/ios/app/chmod-toolkit/id6756904066 (this page in markdown: same URL + `.md`)
- Developer: [Robert Frederique](https://appshunter.io/developer/1863586316)
- Category: Developer Tools, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 31 MB
- Languages: English
- Released: 2026-01-06
- Data updated: 2026-07-17
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/chmod-toolkit/id6756904066/reviews.md

## What is Chmod Toolkit?

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.

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.

PREPARE BY EXAM DOMAIN
Study by exam domain for CompTIA Linux+, 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.

## Key features

- Unix permissions mastery
- Certification exam simulation
- Spaced repetition learning
- Domain-specific study
- Progress tracking dashboard
- Multi-device support with iCloud sync

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Features | $24.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/chmod-toolkit/id6756904066/reviews.md

### 5/5 — Nothing like it

*2026-04-21*

Currently prepping for Linux+ and this is the first study app that actually feels like exam prep, not just a quiz. The domain tracking shows me where I'm weak before I even take the exam.  Nothing like it covers permissions that I’ve been seen. Going into exam day will feel way more prepared with permissions, which is my weakest area.

## Frequently asked questions about Chmod Toolkit

### What Unix permissions concepts does Chmod Toolkit cover?

Chmod Toolkit covers a comprehensive range of Unix permissions, including chmod, chown, umask, ACLs, and SELinux. It aims to provide mastery of these concepts, not just memorization.

### Does Chmod Toolkit offer exam simulations for Linux certifications?

Yes, Chmod Toolkit features three cert-specific exam modes that simulate actual exam methodologies for Linux+ (90 questions, 90 min), LPIC-1 (60 questions, 90 min), and RHCSA (18 hands-on tasks, 3 hours). It allows skipping, flagging, and returning to questions.

### How does Chmod Toolkit help users learn permissions effectively?

It utilizes spaced repetition, scheduling reviews based on accuracy to focus on areas needing the most attention. The app also employs eight different question types to keep users engaged and sharp.

### What kind of progress tracking is available in Chmod Toolkit?

Chmod Toolkit provides a detailed stats dashboard with interactive charts showing accuracy trends, category strengths, question type performance, and certification readiness. It also includes triple progress rings and daily challenge streaks.

### On which Apple devices can Chmod Toolkit be used?

Chmod Toolkit is built for every Apple device, including iPhone with haptic feedback, iPad with full-screen layouts and split view, and Mac with native sidebar navigation and keyboard shortcuts. Progress syncs automatically via iCloud.

### Is Chmod Toolkit a subscription-based app?

No, Chmod Toolkit is a one-time purchase with no subscription required. All future updates are included with the initial purchase, ensuring you always have the latest features.

### Does Chmod Toolkit require an account or collect user data?

Chmod Toolkit does not require an account to use, and no data leaves your device. Your progress and privacy are protected, as all learning and tracking are done locally.

### How frequently is Chmod Toolkit updated?

The app was last updated on April 15, 2026, indicating a commitment to ongoing development and support. Future updates are included with the purchase.

## Version history (last 5 releases)

### 3.2 — 2026-04-15

NEW: Exam Simulation (Pro)
Simulate Linux+, LPIC-1, and RHCSA exams with cert-specific timing, question counts, and pass/fail scoring. Skip, flag, and return to any question. Domain-by-domain results breakdown after submission.

NEW: Certification Exam Prep (Pro)
Study by exam domain for CompTIA Linux+, LPIC-1, and RHCSA. Track mastery by objective. Know when you're ready to test.

NEW: 3 Question Types
Fill in the blank, type full commands, and multi-step task planning. Eight question types total, matching real certification exam formats.

NEW: Stats Dashboard (Pro)
Interactive charts powered by Swift Charts. Accuracy trends, category performance, question type breakdown, difficulty analysis, and certification domain mastery — all in one place.

NEW: iCloud Sync
Your mastery progress, XP, streaks, and bookmarks now sync across iPhone, iPad, and Mac. Enable in Settings.

NEW: 6 Study Topics
chattr/lsattr, stat, find -perm, SELinux, sudoers, and mount options. Every quiz topic is now covered in the study library.

IMPROVED: Flashcards
Flashcards now surface questions you've already attempted in quizzes, turning them into a focused review tool.

Plus: Quiz timer pause on navigation, improved CloudKit reliability, and performance fixes.

### 3.1 — 2026-03-20

NEW: Flashcard Mode (Pro)
• Quick-fire memorization with 3D card flip animation
• Self-rate with "Got It" or "Review Again" — builds a review pile
• Streak tracking and confetti on deck completion
• Available from the Learn tab

NEW: More Quiz Questions
• SELinux: modes, contexts, restorecon, AVC denials, port labeling
• find -perm: exact vs prefix matching, SUID/SGID audit commands
• Troubleshooting: Docker UID mapping, NFS root_squash, recursive chmod disasters

IMPROVED: Siri Shortcuts
• Shortcuts work with voice
• New "Lookup Common Permission" shortcut added

IMPROVED: Troubleshoot Search
• "Try asking ChmodIQ" fallback when keyword search returns no results
• Pre-populates ChmodIQ with your search text

IMPROVED: Purchase Experience
• Purchase button always visible — no more scrolling to find it
• Mac paywall scrolling fixed

Bug Fixes
• Fixed tap targets on all card-style buttons across the app
• Constrained button widths on Mac for consistent appearance
• Fixed environment object crash on Mac paywall

### 3.0.1 — 2026-03-14

IMPROVED: Notifications
• Tapping notifications now takes you directly to the Learn tab
• Notifications now persist in Notification Center

IMPROVED: UX (iOS 26)
• Enhanced UX effects with interactive feedback on buttons
• New "Hide Tab Bar on Scroll" option in Settings

Bug Fixes
• Fixed quiz mode cards displaying at inconsistent heights
• Daily Challenge numbering now starts from release date

### 3.0 — 2026-03-14

NEW: Daily Challenge
• One question every day — build a daily streak alongside your quiz streak
• Deterministic question selection so you can discuss with friends
• Available from Learn tab and Quiz mode selection

NEW: Share Quiz Results
• Wordle-style shareable cards after every quiz and daily challenge
• Dark-themed image card with colored grid showing your performance
• Text fallback with emoji squares for messaging and social media

NEW: Smart Notifications
• Three separate notification types you can individually control
• Streak Reminders: daily nudge to keep your quiz streak alive
• Daily Challenge: evening reminder if you haven't completed today's question
• Questions Due: spaced repetition alerts when questions are ready for review

IMPROVED: Widgets
• Interactive calculator now available in medium size — more compact, same functionality

Bug Fixes
• Fixed daily challenge allowing re-entry after completion
• Lowered review prompt thresholds for better timing
• Improved share sheet presentation in quiz views

### 2.5.3 — 2026-03-09

IMPROVED: iPad & Mac Experience
• Optimized font sizes across all iPad views for better readability on larger screens
• Improved scroll performance in Learn and Examples tabs on Mac
• Expanded click targets for Mac sidebar navigation
• Additional Mac font refinements across 7 more views

Bug Fixes
• Minor stability improvements

## More apps by Robert Frederique

- [SayScribe](https://appshunter.io/ios/app/sayscribe/id6759438198)

All apps by Robert Frederique: https://appshunter.io/developer/1863586316

## Related topics

[rhcsa](https://appshunter.io/ios/topics/rhcsa)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*