Diagram together, in real time

A collaborative canvas for Mermaid diagrams, sticky notes, and text — with live cursors and an AI that can draw with you.

✦ Real-time collaboration✦ AI-native (MCP)✦ Mermaid + canvas

Everything you need to think visually

See teammates’ cursors and selections as they happen. No refresh, no conflicts.

Write Mermaid and it renders instantly, auto-fitting the node — flowcharts, ER, sequence, and more.

Connect Claude over MCP to create and edit diagrams on your board, with your approval.

Browse and restore any past version of a board. Your work is never lost.

Merboard is free. If it helps you, you can sponsor the project with crypto — it’s a donation, no strings attached.