Diagram at the
speed of thought
Arc Draw is an infinite-canvas whiteboard for architecture diagrams and system design — built local-first, so it's never blocked by a network.
Free to use · no credit card · works the moment you open it
how a diagram synced by Arc actually looks
Built on a modern, reliable stack
Why Arc Draw
Everything a fast whiteboard needs
No bloat, no lag, no lost work — just a clean canvas backed by an architecture built to keep it that way.
Infinite canvas
A smooth, hand-drawn canvas powered by Excalidraw — pan, zoom, and sketch without ever hitting an edge.
Local-first by design
Every stroke saves instantly to your browser. Keep drawing on a plane, in a tunnel, or with spotty wifi.
Background sync
Changes quietly push to the cloud the moment you're back online — no spinners, no blocking, no lost work.
Conflict resolution
Built-in safeguards catch clashing edits so an offline change never silently overwrites a newer version.
Thousands of icons
Search, stamp, and recolor icons from Lucide and Iconify directly on the canvas as you diagram.
Secure by default
JWT-based auth with Argon2 password hashing keeps every workspace private to you.
The flow
From idea to diagram in seconds
Arc Draw gets out of your way so the only thing slowing you down is how fast you can think.
Sketch your idea
Drop shapes, icons, and connectors on an infinite canvas the moment inspiration strikes.
It saves itself
Every change lands in IndexedDB instantly, then syncs to the cloud in the background.
Pick up anywhere
Open any device, online or off, and your diagrams are exactly where you left them.
Inside the canvas
A calm, monochrome workspace
Dark-mode-first and distraction-free, so the diagram stays the only thing on screen.
Ready to sketch your next system?
Free to use, no credit card, offline from the first click.