Chmod Toolkit vs DevToolkit Mobile

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.

Dev Toolkit packs the everyday developer utilities you reach for dozens of times a week into one fast, native iOS app — no browser tabs, no terminal, no Wi-Fi required. Whether you're debugging an API token, checking a cron schedule, or converting timestamps on the go, Dev Toolkit gives you instant answers with copyable output you can paste anywhere. FREE TOOLS • Cron Parser — Paste any cron expression and see the next 5 scheduled runs in plain English. Supports standard 5-field and extended @yearly/@monthly shortcuts. • JWT Decoder — Drop in a JSON Web Token and instantly inspect the header, payload, and signature. Expired tokens are flagged automatically. • Encoder / Decoder — Base64, URL-encode, and HTML-encode or decode any string in one tap. • Hash Calculator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any input. Great for checksums and quick verification. • Timestamp Converter — Convert Unix epochs to human-readable dates and back. Handles seconds and milliseconds, with live "ago" formatting. PRO TOOLS Unlock all five Pro tools with a one-time purchase — no subscriptions, no recurring charges. • UUID Generator — Generate RFC 4122 v4 UUIDs in bulk. Copy one or copy all at once. • JSON Formatter — Pretty-print, minify, and validate JSON. Highlights syntax errors with line numbers. • Chmod Calculator — Translate between octal (755) and symbolic (rwxr-xr-x) Unix file permissions interactively. • SQL Formatter — Clean up messy SQL queries with proper indentation and keyword capitalization. • Diff Checker — Compare two blocks of text side-by-side or as a unified diff. Spot changes instantly. WHY DEV TOOLKIT • Native iOS 17+ — Built entirely in SwiftUI. No wrappers, no web views. Feels right at home on iPhone and iPad. • Adaptive layout — NavigationStack on iPhone, NavigationSplitView on iPad for a true split-pane experience. • Offline-first — Every tool works without an internet connection. Your data never leaves your device. • Dark mode — Full dark and light appearance support. • One-tap copy — Every output view has a copy button. Generate, copy, paste. Done. • No accounts — No sign-up, no cloud sync, no tracking. Open the app and get to work. • Private — Zero analytics beyond what Apple provides. No data collection. BUILT FOR DEVELOPERS, BY A DEVELOPER Dev Toolkit Mobile focuses on the utilities that are annoying to do in a browser and overkill to open a terminal for. It's the app you keep in your dock for the quick stuff. Free forever: Cron Parser, JWT Decoder, Encoder/Decoder, Hash Calculator, Timestamp Converter. Pro (one-time): UUID Generator, JSON Formatter, Chmod Calculator, SQL Formatter, Diff Checker.