Offline PDF Editor vs Sunwindow

ProperPDF is the PDF editor that never uploads your files. Every tool runs 100% on your device - no internet connection required, no cloud servers involved, no account needed. WHY PROPERPDF? Your documents contain sensitive information - contracts, tax forms, medical records, school assignments. Most PDF apps upload your files to remote servers for processing. ProperPDF processes everything locally on your device. Your files never leave your phone. COMPLETE PDF TOOLKIT - Merge & Combine - Join multiple PDFs into one document - Split & Extract - Pull out specific pages or page ranges - Compress - Reduce file size without losing quality - Convert - PDF to JPG, PNG, or image to PDF - Lock & Unlock - Add or remove password protection - Sign - Draw or type your signature directly on any PDF - Fill Forms - Complete PDF forms on your phone - Rotate, Reorder & Delete - Organize pages exactly how you need them - Edit Metadata - Update document title, author, and properties - View & Read - Fast, smooth PDF reader with zoom and navigation AI-POWERED PDF CHAT Ask questions about your documents and get instant answers. Summarize lengthy reports, extract key points, or search through content - all powered by on-device AI. Your conversations stay private because the AI runs locally on your phone. BUILT FOR PRIVACY - Zero cloud uploads - files never leave your device - Zero internet required - works in airplane mode - Zero accounts needed - no sign-up, no tracking - Zero data collection - we don't see your documents PERFECT FOR Students - annotate textbooks, merge lecture notes, compress assignments Professionals - sign contracts, fill forms, organize documents Anyone - handle everyday PDF tasks without trusting a cloud server WORKS OFFLINE. ALWAYS. No Wi-Fi? No problem. Every feature works without an internet connection. Whether you're on a flight, in a meeting, or somewhere without service - ProperPDF has you covered. Download ProperPDF - the PDF editor that respects your privacy. Privacy Policy: https://tryproperpdf.app/privacy-policy Terms of Service: https://tryproperpdf.app/terms-of-service

Built for photographers, made for anyone who loves good light. Pick any place and any date, and SunWindow lays out the whole day: golden hour, blue hour, civil, nautical and astronomical twilight, sunrise, sunset and true night — all computed on your device in seconds. **THE DAY AT A GLANCE** - A single wheel showing every light phase from dawn to dark - Full times table with every transition - Live countdown to the next window **SEE WHERE THE SUN WILL BE** - Sun rays drawn directly on the map - Elevation and azimuth for any moment - Drag the pin anywhere — the whole day recalculates instantly **PLAN THE WHOLE YEAR** - Year chart showing how your light shifts season to season - Find the date when the sun lines up with your shot **NEVER MISS THE LIGHT** - Bell reminders on any phase - Set your own lead time so you arrive early, not late **MADE TO BE LIVED IN** - Background colors shift with the sky - No accounts. No ads. No tracking. **A note on accuracy** SunWindow is a planning guide, not a navigation instrument. Times are computed with standard astronomical algorithms and are accurate to well under a minute for planning purposes, but local terrain, horizon obstructions and atmospheric conditions will shift what you actually see.