Calca

Calca

Calca is an open canvas for every format. Describe a page, a prototype, a brand
board, a deck slide — get live variations as movable frames, then remix, export,
or hand the board to your agent.

  • Open source — every layer of the stack is open, end to end.
  • BYOK — bring your own AI provider; your key never leaves your browser.
  • Web + desktop — use the app at
    calca.illo.fyi/app or download the desktop build.
  • Agent-ready — the calca CLI exposes the canvas over MCP so Claude,
    Cursor, Codex and friends can read, propose, and arrange boards.

Where to go next

I want to… Doc
Run the app and make my first frame Quick start
Set up my AI provider Providers & BYOK
Pick the right output format Formats & presets
Let an agent drive my canvas Agents & MCP
Install the desktop app Desktop app

Development and contribution docs live in the repository under .agents/docs/
and CONTRIBUTING.md. Everything here is for people using Calca.

Next Quick start