DS file vs InstruKit

**You must own a Synology NAS to run this app, and have upgraded to DSM 5.2 to get the complete set of features** DS file is ideal to manage files stored on your DiskStation, upload or download between the NAS and the iDevice itself, or do basic editing tasks. And always securely with HTTPS support. Besides file management, DS file is also a useful tool to do anything from browsing pictures, watching videos or checking work documents when you are on the go.

InstruKit turns the sensors, camera, and compute already in your iPhone into a focused, precise-feeling set of pocket instruments. It doesn't just show you one reading — it helps you save results, archive them into projects, and compare change over time. Measure, Save, Compare. Why choose InstruKit: - No login required — open and measure - No ads, no tracking - A dozen-plus tools for angle, sound, vibration, light, magnetic fields, location, and camera capture - The core loop: Measure → Save → Compare - Every record carries its source, method, and confidence - Data stays on your device by default The toolset: - Level: surface / edge / plumb angles with zero-reference support - Sound Level: real-time relative digital level (dB), 24-band spectrum, and recording summaries - Vibration: acceleration RMS / peak measurement and recording summaries - Light Estimate: illuminance estimated from camera exposure parameters (experimental) - Magnetic: field strength readings and relative fastener magnetic-anomaly detection - Location & Heading: single-point coordinates, altitude, and heading - Magnifier / Text Recognition / Code Scanning: viewfinder, recognition, and saving - Optical RPM (experimental): rotation speed estimated from camera frame-rate observation - Flashlight / Screen Light: multi-mode lighting utilities - Device Info / Network Status / Bluetooth Nearby: on-device and local-network facts at a glance Honest about measurement limits: We don't invent precision. Light is an estimate derived from camera exposure. Optical RPM is experimental. Sound shows a relative digital level, not a calibrated SPL meter. Fastener detection is a magnetic-anomaly reference only — not a wire finder or distance tool. Every result is labeled with its method and confidence, so you always know what it can and cannot tell you. Built for comparison: Save two measurements of the same kind and see the delta and percent change side by side. Archive records into projects and revisit before/after data anytime. Comparison results and measurement details can be exported as PDF diagnostic reports or CSV data for filing and collaboration. Privacy-first by design: No account registration. Your measurement records, captures, and settings stay on your device by default. The app contains no advertising SDKs and no third-party analytics or crash reporting, and it never tracks you across apps. Unlock InstruKit Pro: - Unlimited saving of measurement records, projects, and comparisons - Export PDF diagnostic reports and CSV data - Share measurement cards as images Subscriptions auto-renew (monthly or yearly; yearly includes a 7-day free trial), or choose the one-time lifetime purchase. Manage or cancel anytime in iPhone "Settings → [Your Name] → Subscriptions"; benefits remain until the end of the current period. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/