The native macOS architecture whiteboard — and the fastest way to start architecting. Press ⌥⌘W and the screen you're already staring at becomes a hand-drawn board: sketch the system, pin the real files, wire in your vault.
Free & open source · 100% Swift, zero Electron · Requires macOS 26
No web view. No Electron. No compromise.
Idle, your sketches rest on the wallpaper and clicks pass through to Finder. Hit ⌥⌘W and the desktop becomes a live board — every stroke a faithful Swift port of rough.js, rendered in pure Core Graphics.
Solid white when you need focus. A light wash that lets the wallpaper breathe. Or fully transparent — drawing straight onto your desktop. One switch in the gear menu; your drawings stay put across all three.
Press / to Spotlight-search anything on your Mac and drop it in as a live linked card — real Quick Look thumbnails, modified dates, a Missing badge if it moves. Space to peek, double-click to open. Arrows bind to the cards and re-route when you move them.
Notes drop in as obsidian:// cards that open straight into your vault — wire them to shapes, files, and code cells, and your second brain gets a spatial layer. The sidebar shelf keeps vault search one keystroke away.
Labeled frames, bound arrows and elbow connectors keep system diagrams tidy no matter how fast you sketch — and code cells make them run. This board's monitoring pipeline actually executed to print those p50 / p95 numbers.
Spin up as many boards as you're thinking about — named, reorderable tabs, each with its own autosave and export. Switch instantly; nothing gets lost.
Boards autosave as .excalidraw and export to crisp PNG or true-vector SVG. And when it's time to build, Export as HTML hands the whole board to Claude or any coding agent — every shape, label, and connection in a format it can read. Sketch the architecture, then hand it off.