Calca：面向任意格式的开源画布，支持 BYOK 与智能体接入

An open canvas for every format.
Describe a page, a prototype, a brand board — get live variations as movable frames, then remix, export, or hand the board to your agent.
Open source · BYOK · Web + desktop

Packages

The canvas libraries and the agent playground are on npm — build a canvas app or plug an agent into a board:

Package	What it gives you
`@calca/canvas-base`	Zero-dependency document core: records, commands, undo history, versioned snapshots
`@calca/canvas-ui`	Headless React canvas components — frame chrome, overlays, marquee selection
`@calca/canvas-flow`	React Flow adapter: store → live canvas surface, user edits → commands
`@calca/mcp-core`	Runtime-neutral MCP tool surface and contract for canvas sessions
`@calca/mcp`	The `calca` CLI — stdio MCP server, board files, host installers
`@calca/shared`	Shared TypeScript types for the stack

Point your agent at a board:

npx -y @calca/mcp mcp install claude-code   # also: cursor, codex

Where to go next

Use the app → calca.illo.fyi/app · quick start · docs
Hack on the repo → CONTRIBUTING.md
Ideas & feedback → discussions · roadmap

Calca is open source — see LICENSE and each package's package.json for terms.