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OpenPencil

Open-source, local-first UI design editor that opens and saves Figma files and works with AI agents.

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About OpenPencil

OpenPencil is an open-source design editor that reads and writes Figma's .fig files, so you can open existing designs with their pages, components, instances, variables and auto layout intact. It covers the usual interface-design toolkit (constraints, fills, effects, typography, components with variants) and adds variables as design tokens, shader fills, design linting with one-click fixes, and interactive component previews. It is local-first: files live on your disk, no account or internet is needed, and you can sync through your own S3-compatible storage. Peer-to-peer sharing gives live collaboration with cursors, comments and voice calls. A built-in AI agent can edit the document with your own API key, and a CLI plus MCP server let coding agents like Claude Code or Cursor drive it. Selections export to Vue, React, HTML or Tailwind. The editor, engine and CLI are MIT licensed; a hosted team cloud is on a waitlist. It is a young project, so expect rough edges next to Figma.

Best for: Designers and developers who want Figma-file compatibility without a cloud account or lock-in.

Pros and cons

What works

  • Opens and saves .fig files with components and variables
  • Local-first: no account, works offline
  • CLI and MCP server let AI coding agents edit designs
  • MIT licensed editor, engine and file codec

Why people leave

  • Young project; plugins and polish lag behind Figma
  • Hosted team workspace is still waitlist-only
  • Built-in AI needs your own provider API key

Top OpenPencil alternatives

See all 4
  1. 1Figma logo
    Figma

    The industry standard, with the most plugins, libraries and real-time team features, if cloud lock-in is fine.

    83.8
  2. 2Penpot logo
    Penpot

    More mature open-source design tool with self-hosting and team workspaces, built on open web standards.

    64.8
  3. 3Lunacy logo
    Lunacy

    Free design app that also opens Figma and Sketch files, with built-in icon and photo assets.

    59.6
  4. 4Sketch logo
    Sketch

    Native Mac design app with a long track record, if you work only on macOS and want a polished editor.

    59.4

Why people left OpenPencil

In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.

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OpenPencil: common questions

Is OpenPencil free?

Yes. OpenPencil is free, open-source software.

Is OpenPencil open source?

Yes. The source code is on GitHub at open-pencil/open-pencil.

What platforms does OpenPencil run on?

OpenPencil is available for macOS, Windows, Linux and Web.

What are the best alternatives to OpenPencil?

The highest-ranked OpenPencil alternatives right now are Figma, Penpot and Lunacy. See the full ranked list for pricing, platforms and verified facts.

See all 4 OpenPencil alternatives