Free online whiteboard for hand-drawn diagrams

This is the free ExcaliClaw whiteboard. Draw flowcharts, architecture diagrams, wireframes and quick sketches right in your browser, with no account and nothing to install.

The trial board is not saved: nothing is stored on our servers, and when you close the tab your drawing is gone. If you want to keep it, create a free account and your drawings are saved automatically.

What you get with an account

Persistent storage: every drawing is saved automatically.
Collections and instant search across all your diagrams.
Real-time collaboration: share a link, draw together and see live cursors.
MCP tools so AI agents such as Claude, Cursor and VS Code can create diagrams with you.

ExcaliClaw is free to start and no credit card is required. See the pricing for team plans, or read about ExcaliClaw.