Chmod Toolkit vs AppPreviewCut

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.

App Previews are the short promo videos on your app product page. App Store Connect requires very specific formats and resolutions for each device for the videos to be uploaded and accepted. This app is built to create and edit those videos from your screen recordings—with file formats and encoding presets that match Apple developer requirements so you get it right the first time. Create a project, pick the device and orientation (e.g. iPhone portrait, iPad landscape, Mac, Apple TV, or Vision Pro). Trim and join your screen recordings, adjust speed, add B-roll, then export. The app uses the exact resolutions and video audio codec specifications required for each App Preview type, so you don’t have to look up dimensions or convert to a different format. FEATURES • Built for App Previews—formats and resolutions match App Store Connect requirements • Presets for iPhone, iPad, Mac, Apple TV, and Vision Pro (portrait & landscape) • Insert an introduction title screen • Trim and join screen recordings • Speed up or slow down clips • Per-clip volume and mute • Create title screen with app icon, title, and description • Add background track from our royalty-free stock music library EXPORT Choose a preset when you create a project; export uses that preset’s resolution and aspect ratio. No guessing—just pick the App Preview type you need and export. Save to Files, export to Photos, or AirDrop to your Mac to upload. Designed for light and dark mode with a clean, neutral interface so your screen recordings stay the focus. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/