The free Excalidraw workspace
for humans and AI agents.
Save and organize diagrams, collaborate live, and let Claude, Codex, or your own tools create and edit the same canvas through MCP, the CLI, or REST.
First 10,000 verified accounts keep the core workspace free · 3 diagrams to start · Earn more capacity · no credit card
Developer platform
Control your diagrams from Claude, the terminal, or the API.
Excaliwow is a hosted platform, not just an editor. Create, render, and edit diagrams from a script, your terminal, or your AI agent, against the same canvas your team draws on.
- REST API
- A public /api/v1 to list, read, create, render, and edit diagrams over plain HTTP.
- CLI
- @excaliwow/cli on npm. Script your diagrams locally or in CI, with inline previews.
- MCP server
- @excaliwow/mcp on npm. Eighteen tools so Claude and other agents can build, regenerate, and tidy your diagrams.
# create a diagram from a spec, in your terminal
npx @excaliwow/cli diagrams create --spec architecture.json
# render an existing one to a PNG
npx @excaliwow/cli diagrams render <id> --format png -o out.png{
"mcpServers": {
"excaliwow": {
"command": "npx",
"args": ["-y", "@excaliwow/mcp"],
"env": { "EXCALIWOW_TOKEN": "excw_pat_…" }
}
}
}Built for teams who sketch to think.
Every feature earns its keep. No Kanban board bolted on, and no AI forced into your canvas. Connect Claude or your own tools through the developer platform when you want them, and the canvas stays yours when you don't.
- 01
Folders that feel like your brain
Organize diagrams the way your team already thinks. Nest, drag, star, and restore instantly.
- 02
Live cursors, live edits
See teammates move across the canvas. Concurrent edits merge cleanly, so two people drawing at once never clobber each other's work.
- 03
Comments pinned to the work
Drop a pin anywhere, start a thread. Resolve, reopen, and reply — no Slack-to-Figma context hunt.
- 04
Share links that respect permissions
Public read-only URLs, password-gated previews, or invite-only access. One toggle, revocable any time.
Questions, answered.
- What is Excaliwow?
- Excaliwow is a hosted, real-time Excalidraw workspace with a developer platform. You can sketch on a shared canvas with your team — live cursors, comments, and share links — or create and edit the same diagrams programmatically from the command line, a REST API, or an AI agent over MCP.
- Is Excaliwow free?
- Yes. The first 10,000 verified accounts keep the core Excaliwow workspace at a $0 subscription fee while Excaliwow operates. That includes browser collaboration, sharing, and the REST API, CLI, and MCP server. Accounts start with 3 diagram slots and can earn more capacity. No credit card is required.
- What does Founding Free guarantee?
- A qualifying account receives a permanent, non-recycled founding number from 1 to 10,000 after verification. Its current core workspace stays at a $0 subscription fee while Excaliwow operates. Normal diagram capacity, API rate, abuse, security, and availability limits still apply, and optional future add-ons or new products may be paid.
- How is Excaliwow different from Excalidraw?
- Excalidraw is the open-source drawing editor. Excaliwow is built on it and adds what teams need to work together over time: hosted accounts, persistent diagrams and folders, real-time multiplayer in a shared workspace, public share links, and a developer platform — a REST API, CLI, and MCP server — for automating diagrams.
- Does Excaliwow work with Claude and other AI agents?
- Yes. The @excaliwow/mcp server connects Excaliwow to Claude and other MCP clients through a small set of tools to create, read, render, and edit diagrams. Your agent builds and updates real diagrams in your account, which you can then open and refine in the browser.
More in the full FAQ.
Sketch with your team,
at the speed of talking.
The first 10,000 verified accounts keep today’s core workspace free while Excaliwow operates: browser collaboration, sharing, REST, CLI, and MCP. Start with 3 diagram slots and earn more. Optional future add-ons may be paid; this account promise is not. No sales calls or credit card.