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.
Press ⌘I and describe it. The agent opens with a two-line design spec, then draws live on your board — shapes, bound arrows, infra stencils, even cells it runs. Claude, GPT, or local Ollama; your key stays in the Keychain, and it can ground diagrams in your vault.
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.
Whitespace runs a local MCP server. Point Claude Code, Claude Desktop, or Cursor at it and the model reads, draws, and edits the live board while you watch — loopback-only, token-gated, and it can never run code. Boards autosave as .excalidraw and export to crisp PNG or true-vector SVG.