Every feature serves one purpose — to take you from looking it up to knowing it cold. Calculate, learn, practice, and prove your knowledge.
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Simulate Real Certification Exams
Three cert-specific exam modes matching actual methodology. Linux+ (90 questions, 90 minutes, scaled to 720/900), LPIC-1 (60 questions with fill-in-the-blank), RHCSA (18 tasks over 3 hours with reference materials). Skip, flag, and return to any question.
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Study by Certification Domain
Questions mapped to specific Linux+, LPIC-1, and RHCSA exam objectives. Track mastery domain by domain. A readiness indicator tells you when you're prepared to sit for the exam.
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Practice That Matches Real Formats
Eight question types including multiple choice, type the octal, symbolic conversion, fill-in-the-blank, typed commands with flag validation, and multi-step task planning. Spaced repetition schedules reviews where it matters most.
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See Your Growth
Stats dashboard with accuracy trends, category strengths, question type breakdown, and certification domain mastery. Daily challenge streaks and progress rings keep you accountable.
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Structured Study Topics
Comprehensive lessons covering chmod, chown, umask, ACLs, SELinux, sudoers, and more. Coming from Windows? A dedicated section maps NTFS concepts to Unix permissions.
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Chmod Calculator
Interactive permission calculator with real-time numeric and symbolic conversion. Describe permissions in plain English with ChmodIQ. Toggle between File and Directory modes.
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Security Scanner
24 security checks based on OWASP, CIS, NIST, and PCI DSS standards. Scan terminal output, photos, or local Mac folders. Automatically generated fix commands.
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Error Doctor
Paste terminal error messages and get instant diagnosis and fix recommendations. Recognizes 30+ common permission error patterns across Linux and macOS.
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iCloud Sync
Progress, mastery data, streaks, and preferences sync across iPhone, iPad, and Mac through your personal iCloud. Enable once, stays in sync automatically.
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Mac-Native Experience
Full desktop support with sidebar navigation, keyboard shortcuts, drag-and-drop folder scanning, and native file picker. Feels at home on macOS.
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Widgets & Shortcuts
Home screen and lock screen widgets for quick permission reference. Siri Shortcuts, Spotlight search, and Control Center integration.
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Bookmarks, Flashcards & Export
Save frequently used permissions for one-tap recall. Reinforce with flip-card flashcards. Export scan results to CSV for compliance and reporting.
