DayPin puts sticky notes on your Mac desktop with one keystroke. Native SwiftUI, universal binary, ~4 MB, no account, no telemetry. FORMAT: bold, italic, underline, checklists, code, quotes, headings. Markdown that hides the markup (WYSIWYG). CAPTURE: global hotkey; menu bar icon; 16 colors + custom picker; click checkboxes to toggle done. PRO ($3 one-time): unlimited pins, iCloud sync, export MD/PDF/TXT, search, JSON tools, custom hotkey, opacity.