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OpenCrease 0.1.0

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@tinsever tinsever released this 18 Oct 14:07
v0.1.0
781f76b

The first public release of OpenCrease: a free, local-first design tool where the canvas is real HTML and CSS, built for working with AI agents over MCP.

OpenCrease editor

What's in it

  • Real HTML/CSS canvas: frames, text, images, SVG and vector editing with a pen tool, flex and grid layout, constraints, guides and snapping, pages.
  • Styling: OKLCH colour picker, gradients, image fills and crop, filters, shadows, rich text, Google Fonts, and about 30 WebGL shaders usable as fills.
  • Design system: tokens with light/dark modes, text styles, and components with variants, props and code mapping.
  • Agents: a local MCP server (stdio and Streamable HTTP) with Paper-compatible tool names and shapes, plus oc_ extras. Works with Claude Code, Codex, Cursor and other MCP clients. Includes a per-client permission prompt and a built-in agent panel for your own LLM provider.
  • Export: React, Tailwind and HTML code; PNG, JPG, WebP, AVIF, SVG and PDF; video export; a headless CLI renderer.
  • Import: paste HTML and Figma clipboard content; a Snapshot browser extension that captures live pages as editable layers.
  • Version history: named snapshots, diffs and one-step restore.
  • Files on your disk: plain JSON .fold folders that diff well in git. No account.

Downloads

File Platform
OpenCrease-0.1.0-arm64.dmg macOS, Apple Silicon
OpenCrease-0.1.0-x64.dmg macOS, Intel
OpenCrease-0.1.0-*-mac.zip The same apps as ZIP archives
OpenCrease-Snapshot-0.1.0-chrome.zip Snapshot extension for Chromium browsers (load unpacked, then paste the Snapshot token from Connect an agent)
OpenCrease-Snapshot-0.1.0-firefox.zip Snapshot extension for Firefox (temporary add-on)

The macOS apps are ad-hoc signed but not notarized. The first time you open the app, macOS blocks it: go to System Settings → Privacy & Security and click Open Anyway. Checksums are in SHA256SUMS.txt.

Windows and Linux builds aren't published yet. On those platforms, run from source: pnpm install && pnpm dev.

Known limits

  • Single user. There's no collaboration or sync yet.
  • AI providers and Figma paste have only been tested against mocks and synthetic fixtures, and the Firefox extension hasn't been tested in a real browser.

Licensed under AGPL-3.0-or-later. The format, model, css and protocol packages are MIT.

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