OpenPencil: The Open-Source Figma Killer Developers Secretly Needed

What if your design tool locked you out of your own files tomorrow? No warning, no migration path—just a proprietary binary format that only one company's software can read. Sound far-fetched? Figma already killed CDP automation in version 126, breaking figma-use and countless developer workflows overnight. Your design system, your component libraries, your team's collaborative history—all held hostage by a platform that actively fights programmatic access.

Here's the brutal truth: Figma's MCP server is read-only. Their format is closed. Their roadmap serves shareholders, not the developers who built design-system culture.

But what if you could open .fig files natively, script every operation, run AI design agents locally, and collaborate peer-to-peer without servers or accounts? What if your design tool weighed 7 MB, shipped as a programmable toolkit, and put you back in control?

Meet OpenPencil—the AI-native, open-source design editor that's making closed platforms nervous. Born from the frustration of developers who watched their automation break one too many times, OpenPencil isn't just another Figma clone. It's a programmable design operating system with a headless Vue SDK, 100+ AI tools, real-time WebRTC collaboration, and a CLI that turns design files into queryable, lintable, exportable data.

This is the tool top developers are quietly adopting. And after reading this, you'll understand why.

What Is OpenPencil?

OpenPencil (open-pencil/open-pencil) is an AI-native, open-source design editor built to replace proprietary tools with something developers can actually own. Created by a team committed to design-tool freedom, it reads and writes native .fig files, introduces its own .pen format, and ships as both a desktop application and a browser-based PWA.

Current status: Active development. Not production-ready yet—but advancing rapidly with 188 E2E tests, 764 unit tests, and a growing contributor base.

The project distinguishes itself from a similarly-named tool (OpenPencil by ZSeven-W) by focusing specifically on Figma-compatible visual design with real-time collaboration, rather than AI-native design-to-code workflows. Though honestly? OpenPencil does both.

Why it's trending now: The developer community has reached a breaking point with closed design platforms. When Figma's acquisition by Adobe fell through, the trust was already broken. OpenPencil arrives at the perfect moment—offering native .fig compatibility without the lock-in, AI integration without cloud dependencies, and programmability that Figma actively prevents.

The tech stack reveals serious engineering ambition: Skia (CanvasKit WASM) for rendering, Yoga WASM for flex and CSS grid layout, Vue 3 with Reka UI and Tailwind CSS 4 for the interface, Kiwi binary + Zstd + ZIP for file formats, and Trystero (WebRTC P2P) + Yjs (CRDT) for serverless collaboration. The desktop app runs on Tauri v2—explaining that remarkable ~7 MB footprint.

Key Features That Separate OpenPencil from the Pack

OpenPencil isn't a feature-parity chase. It's a fundamentally different approach to design tooling. Here's what makes it extraordinary:

Native .fig and .pen File Support Read and write actual Figma files. Open them from the app, your OS file browser, or programmatically. Copy and paste nodes between applications. Your existing design library? It works here—no conversion, no data loss, no vendor lock-in.

AI-Powered Design Generation Press ⌘+J and describe what you want. Over 90 specialized tools create and modify nodes, manage auto-layout, run boolean operations, analyze tokens, and export assets. Connect your own API keys for OpenRouter, Anthropic, OpenAI, Google AI, Z.ai, MiniMax, or compatible endpoints. No backend. No account. No data leaves your machine.

Fully Programmable Architecture This is where OpenPencil diverges radically from every design tool you've used:

• Headless CLI for automation and CI pipelines
• XPath queries for precise node selection
• Figma Plugin API via eval for scripted modifications
• MCP server for AI agent integration
• Desktop agent integrations for Claude Code, Codex, and Gemini CLI

Vue SDK for Custom Editors Headless components and composables let you embed OpenPencil into other applications or build workflow-specific editing surfaces. Your CRM needs a visual email builder? Your CMS needs inline layout editing? The SDK makes it possible.

Real-Time Peer-to-Peer Collaboration Share a link. Co-edit instantly. No server. No account. WebRTC direct connection with cursors, presence indicators, and follow mode. Your data never transits through someone else's infrastructure.

Advanced Layout Engine Auto layout and CSS Grid via Yoga WASM, with full support for gap, padding, alignment, and track sizing. The team even maintains a forked Yoga branch with grid support.

Design System Intelligence Lint naming, layout, structure, and accessibility. Analyze colors, typography, spacing, and component clusters. Extract design tokens automatically. Convert between formats. Export to JSX/Tailwind.

Where OpenPencil Absolutely Shines: Real-World Use Cases

1. Design System Governance at Scale

You're managing a 500-component design system across 12 product teams. Figma's analytics are surface-level, and automated linting is nonexistent. With OpenPencil's CLI, you run nightly CI pipelines that:

• Lint every .fig file for naming conventions and accessibility
• Analyze color usage to find "zombie" hex codes outside the token system
• Detect component clusters that should be formalized into official components
• Export token variables for the engineering team's consumption

2. AI-Assisted Rapid Prototyping

A founder needs a landing page mockup by tomorrow. Instead of wrestling with layout tools, they open OpenPencil, press ⌘+J, and type: "Create a hero section with headline, subhead, two CTAs side by side, and a product screenshot placeholder with rounded corners and subtle shadow." The AI agent creates the structure, applies auto-layout, sets responsive constraints, and generates Tailwind-ready export code.

3. Headless Design Operations

Your e-commerce platform generates thousands of personalized product images. Using OpenPencil's Vue SDK, you embed a headless editor into your admin dashboard. Merchandisers adjust layouts visually; your backend receives structured .pen files and renders them at scale via the CLI's export commands. Design operations without design bottlenecks.

4. Cross-Functional AI Agent Workflows

Your engineering team uses Claude Code for feature development. With OpenPencil's MCP server, the same agent that writes your React components can also:

• Inspect the design file for the feature
• Export assets at required resolutions
• Analyze whether the implementation matches spacing tokens
• Modify the design when requirements change

One agent. Design and code. No context switching.

5. Privacy-Critical Design Collaboration

A healthcare startup can't use cloud-based design tools due to HIPAA requirements. OpenPencil's WebRTC P2P collaboration means designers co-edit without any server infrastructure. Files stay local. Data never leaves the organization's network perimeter.

Step-by-Step Installation & Setup Guide

macOS (Recommended)

The fastest path to a working OpenPencil installation:

# Install via Homebrew tap
brew install open-pencil/tap/open-pencil

Alternatively, grab the latest release directly:

# Download from GitHub releases page
# https://github.com/open-pencil/open-pencil/releases/latest

Web App (Zero Installation)

For immediate experimentation without any local setup:

# No commands needed—just navigate to:
# https://app.openpencil.dev
# Or try the demo directly:
# https://app.openpencil.dev/demo

CLI Installation (Global)

The CLI unlocks OpenPencil's full programmatic power:

# Install globally with bun (recommended by the project)
bun add -g @open-pencil/cli

# Verify installation
open-pencil --version

Development Environment (Contributors)

Want to hack on OpenPencil itself? You'll need Rust for Tauri builds:

# Clone the repository
git clone https://github.com/open-pencil/open-pencil.git
cd open-pencil

# Install dependencies
bun install

# Start the development server
bun run dev        # Serves at localhost:1420

# Or run the desktop app
bun run tauri dev  # Requires Rust toolchain installed

Prerequisites for desktop builds:

• Rust via rustup
• Platform-specific Tauri v2 prerequisites (follow their guide)

Quality Gates (Before Contributing)

bun run check      # Lint + typecheck—pass this first
bun run test       # E2E visual regression (188 tests)
bun run test:unit  # Unit tests (764 tests)
bun run format     # Code formatting

REAL Code Examples from the Repository

Let's examine actual capabilities from OpenPencil's documentation, with detailed explanations of what each command accomplishes and how to leverage it.

Example 1: Inspecting Design File Structure

# Browse the complete node tree of any .fig or .pen file
open-pencil tree design.fig

# Search for specific node types
open-pencil find design.pen --type TEXT

# Inspect a specific node by its ID
open-pencil node design.fig --id 1:23

# Get summary information about the document
open-pencil info design.fig

What this reveals: The tree command outputs a hierarchical view of your design's document structure. You'll see pages, sections, frames, and their nested children with IDs and names. This is invaluable for understanding how a design is organized before scripting modifications. The find command with --type TEXT locates all text nodes—useful for auditing copy, checking for placeholder text, or preparing localization exports. The --id flag lets you target precise nodes for surgical operations.

Sample output:

[0] [page] "Getting started" (0:46566)
  [0] [section] "" (0:46567)
    [0] [frame] "Body" (0:46568)
      [0] [frame] "Introduction" (0:46569)
        [0] [frame] "Introduction Card" (0:46570)
          [0] [frame] "Guidance" (0:46571)

Notice the (0:46566) notation—that's the node ID you'll use for targeted operations.

Example 2: XPath-Powered Node Queries

# Find all frame nodes in the document
open-pencil query design.fig "//FRAME"

# Filter frames by width constraint
open-pencil query design.fig "//FRAME[@width < 300]"

# Locate text nodes with specific naming patterns
open-pencil query design.fig "//TEXT[contains(@name, 'Button')]"

# Find all elements with rounded corners
open-pencil query design.fig "//*[@cornerRadius > 0]"

# Select text nested within section containers
open-pencil query design.fig "//SECTION//TEXT"

Why XPath matters: Traditional design tools force manual clicking and visual scanning. XPath brings the precision of web scraping to design files. The //FRAME[@width < 300] query finds mobile-sized frames that might need responsive attention. //*[@cornerRadius > 0] identifies your system's rounded-corner components for token extraction. The descendant selector //SECTION//TEXT grabs text nodes regardless of nesting depth—perfect for bulk copy extraction.

Pro tip: Chain these with --json for machine-readable output that feeds into other tools.

Example 3: Multi-Format Export Pipeline

# Default PNG export
open-pencil export design.fig

# JPG at 2x scale with quality control
open-pencil export design.fig -f jpg -s 2 -q 90

# Export specific page back to .fig format
open-pencil export design.fig -f fig --page "Page 1"

# Generate Tailwind-ready React components
open-pencil export design.fig -f jsx --style tailwind

# Convert between document formats
open-pencil convert design.pen output.fig

The Tailwind export produces code like this:

<div className="flex flex-col gap-4 p-6 bg-white rounded-xl">
  <p className="text-2xl font-bold text-[#1D1B20]">Card Title</p>
  <p className="text-sm text-[#49454F]">Description text</p>
</div>

Pipeline integration: The -s 2 flag generates retina-ready assets automatically. The --page selector lets you export specific flows for developer handoff. Format conversion (convert) enables migration paths between .pen and .fig—critical for gradual adoption or vendor escape strategies.

Example 4: Programmatic File Modification via Figma Plugin API

# Read-only: count children on current page
open-pencil eval design.fig -c "figma.currentPage.children.length"

# Write operation: reduce opacity of selected nodes
open-pencil eval design.fig -c "figma.currentPage.selection.forEach(n => n.opacity = 0.5)" -w

The -w flag is critical: Without it, OpenPencil runs in read-only mode. The -w (write) flag persists modifications back to the file. This is the full Figma Plugin API running headlessly—no GUI needed. You can create nodes, modify properties, manage components, and execute any operation the Plugin API supports.

Live app integration: When the desktop app runs, omit the file argument entirely:

# Connect to running editor via RPC
open-pencil tree                               # Inspect live document
open-pencil export -f png                      # Screenshot current canvas
open-pencil eval -c "figma.currentPage.name"   # Query editor state

This enables real-time automation: CI pipelines that screenshot visual regressions, AI agents that modify designs based on code changes, and integration tests that verify design system compliance.

Advanced Usage & Best Practices

Machine-Readable Output for Pipelines Every CLI command supports --json. Use this for:

• Feeding design token data into Style Dictionary
• Generating visual regression baselines
• Building design system dashboards

open-pencil analyze colors design.fig --json > tokens.json

Scoped MCP Operations Set OPENPENCIL_MCP_ROOT to restrict file operations to a specific directory. Essential for multi-tenant environments or when exposing OpenPencil to untrusted AI agents:

export OPENPENCIL_MCP_ROOT=/project/designs
openpencil-mcp-http  # Now scoped to /project/designs

AI Agent Skill Installation Teach any compatible coding agent to use OpenPencil:

npx skills add open-pencil/skills@open-pencil

This works with Claude Code, Cursor, Windsurf, Codex, and any skills.sh-compatible agent.

Collaboration Security Generated share links use WebRTC with no signaling server persistence. For sensitive work, verify your network configuration prevents STUN/TURN leakage, or operate entirely within closed network segments.

OpenPencil vs. The Alternatives: Why Make the Switch?

The decisive factors: If you need programmatic access, local AI, tiny footprint, or freedom from platform risk, OpenPencil is currently unmatched. If you need production stability today or team-wide adoption without technical onboarding, Figma still holds temporary advantage—though OpenPencil's active development is closing that gap rapidly.

FAQ: What Developers Ask About OpenPencil

Is OpenPencil ready for production use? Not yet. The project explicitly states "Active development. Not ready for production use." Follow releases for stability milestones.

Can I really open my existing Figma files? Yes. OpenPencil reads .fig files natively and writes them back. Copy and paste nodes between applications. Your existing library is portable.

Does the AI require sending my designs to external APIs? Only if you configure external providers. The AI runs with your own API keys, and no backend or account is required. For maximum privacy, use local models via compatible endpoints.

How does collaboration work without servers? WebRTC peer-to-peer with Yjs CRDTs for conflict resolution. Generate a share link, send it to collaborators, and edit simultaneously. No data transits through OpenPencil infrastructure.

Can I build my own editor with the Vue SDK? Absolutely. The @open-pencil/vue package provides headless components and composables. Embed visual editing into any Vue 3 application.

What's the difference between this and Penpot? Penpot is an excellent open-source design tool with its own format. OpenPencil prioritizes native Figma compatibility and extreme programmability—headless CLI, MCP server, XPath queries, and AI agent integration.

How do I contribute or report issues? Clone the repository, run bun install, and pass the quality gates (bun run check, bun run test). The project welcomes contributions—check openpencil.dev for documentation.

Conclusion: The Future of Design Is Programmable—and Yours

OpenPencil represents something rare in design tooling: a genuine paradigm shift rather than incremental improvement. Where Figma built walls, OpenPencil builds bridges. Where proprietary platforms hoard your data in unreadable formats, OpenPencil gives you XPath queries, CLI automation, and headless SDKs.

The ~7 MB desktop app. The 100+ AI tools running locally. The WebRTC collaboration without surveillance. The full Figma Plugin API executing from terminal scripts. These aren't features—they're freedoms that developers have been denied for too long.

Is it production-ready today? Not quite. But the trajectory is unmistakable. With 188 E2E tests, 764 unit tests, Skia rendering, Yoga layout engine, and a team shipping consistently, OpenPencil is approaching viability faster than most open-source projects.

My take: If you're building design systems, running AI-assisted workflows, or simply refuse to accept that your creative tools should be someone else's silo, OpenPencil deserves your attention. Install the CLI. Try the web demo. Star the repository and watch the releases.

The closed-platform era of design tooling is ending. The programmable, open, AI-native future is being built right now—and you can help shape it.

⭐ Star OpenPencil on GitHub · Try the Demo · Read the Docs