Merboard
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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.

Start a board — freeNo sign-up needed
✦ Real-time collaboration✦ AI-native (MCP)✦ Mermaid + canvas
Diagram together, in real time

Everything you need to think visually

Live collaboration

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

Live collaboration

Mermaid diagrams

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

Mermaid diagrams

Draw with AI

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

Draw with AI

Version history

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

Version history

Up and running in seconds

  1. 1

    Open a board — no account required

  2. 2

    Type Mermaid, drop notes, invite anyone with a link

  3. 3

    Let AI help, and restore any version anytime

Free, forever

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

Sponsor the project