<p align="center">
  <img src="./apps/desktop/build/icon.png" alt="OpenPencil" width="120" />
</p>

<h1 align="center">OpenPencil</h1>

<p align="center">
  <strong>The world's first open-source AI-native vector design tool.</strong><br />
  <sub>Concurrent Agent Teams &bull; Design-as-Code &bull; Built-in MCP Server &bull; Multi-model Intelligence</sub>
</p>

<p align="center">
  <a href="./README.md"><b>English</b></a> · <a href="./README.zh.md">简体中文</a> · <a href="./README.zh-TW.md">繁體中文</a> · <a href="./README.ja.md">日本語</a> · <a href="./README.ko.md">한국어</a> · <a href="./README.fr.md">Français</a> · <a href="./README.es.md">Español</a> · <a href="./README.de.md">Deutsch</a> · <a href="./README.pt.md">Português</a> · <a href="./README.ru.md">Русский</a> · <a href="./README.hi.md">हिन्दी</a> · <a href="./README.tr.md">Türkçe</a> · <a href="./README.th.md">ไทย</a> · <a href="./README.vi.md">Tiếng Việt</a> · <a href="./README.id.md">Bahasa Indonesia</a>
</p>

<p align="center">
  <a href="https://github.com/ZSeven-W/openpencil/stargazers"><img src="https://img.shields.io/github/stars/ZSeven-W/openpencil?style=flat&color=cfb537" alt="Stars" /></a>
  <a href="https://github.com/ZSeven-W/openpencil/blob/main/LICENSE"><img src="https://img.shields.io/github/license/ZSeven-W/openpencil?color=64748b" alt="License" /></a>
  <a href="https://github.com/ZSeven-W/openpencil/actions/workflows/ci.yml"><img src="https://img.shields.io/github/actions/workflow/status/ZSeven-W/openpencil/ci.yml?branch=main&label=CI" alt="CI" /></a>
  <a href="https://discord.gg/h9Fmyy6pVh"><img src="https://img.shields.io/discord/1476517942949580952?label=Discord&logo=discord&logoColor=white&color=5865F2" alt="Discord" /></a>
</p>

<br />

<p align="center">
  <a href="https://oss.ioa.tech/zseven/openpencil/a46e24733239ce24de36702342201033.mp4">
    <img src="./screenshot/op-cover.png" alt="OpenPencil — click to watch demo" width="100%" />
  </a>
</p>
<p align="center"><sub>Click the image to watch the demo video</sub></p>

<br />

> **Note:** There is another open-source project with the same name — [OpenPencil](https://github.com/open-pencil/open-pencil), focused on Figma-compatible visual design with real-time collaboration. This project focuses on AI-native design-to-code workflows.

## Why OpenPencil

<table>
<tr>
<td width="50%">

### 🎨 Prompt → Canvas

Describe any UI in natural language. Watch it appear on the infinite canvas in real-time with streaming animation. Modify existing designs by selecting elements and chatting.

</td>
<td width="50%">

### 🤖 Concurrent Agent Teams

The orchestrator decomposes complex pages into spatial sub-tasks. Multiple AI agents work on different sections simultaneously — hero, features, footer — all streaming in parallel with per-member canvas indicators.

</td>
</tr>
<tr>
<td width="50%">

### 🧠 Multi-Model Intelligence

Automatically adapts to each model's capabilities. Claude gets full prompts with thinking; GPT-4o/Gemini disable thinking; smaller models (MiniMax, Qwen, Llama) get simplified prompts for reliable output.

</td>
<td width="50%">

### 🔌 MCP Server

One-click install into Claude Code, Codex, Gemini, OpenCode, Kiro, or Copilot CLIs. Design from your terminal — read, create, and modify `.op` files through any MCP-compatible agent.

</td>
</tr>
<tr>
<td width="50%">

### 🎨 Style Guides

Built-in style guide library with tag-based fuzzy matching. Apply visual styles (glassmorphism, brutalist, retro, etc.) to AI-generated designs. MCP tools for external agent access.

</td>
<td width="50%">

### 📦 Design-as-Code

`.op` files are JSON — human-readable, Git-friendly, diffable. Design variables generate CSS custom properties. Code export to React + Tailwind or HTML + CSS.

</td>
</tr>
<tr>
<td width="50%">

### 🖥️ Runs Everywhere

Web app + native desktop on macOS, Windows, and Linux via Electron. Auto-updates from GitHub Releases. `.op` file association — double-click to open.

</td>
<td width="50%">

### ⌨️ CLI — `op`

Control the design tool from your terminal. `op design`, `op insert` — batch design DSL, node manipulation. Pipe in from files or stdin. Works with desktop app or web server.

</td>
</tr>
<tr>
<td width="50%">

### 🎯 Multi-Platform Code Export

Export to React + Tailwind, HTML + CSS, Vue, Svelte, Flutter, SwiftUI, Jetpack Compose, React Native — all from one `.op` file. Design variables become CSS custom properties.

</td>
<td width="50%">

### 🧩 Embeddable SDK

`pen-engine` (headless) + `pen-react` (React UI SDK) — embed the design engine in your own app. DesignProvider, DesignCanvas, hooks, panels, and toolbar components out of the box.

</td>
</tr>
<tr>
<td width="50%">

### 🛡️ Design System Kit

Manage reusable UIKits with style switching and component composition. Import/export kits from `.pen` files. Built-in registry with MCP tools for external access.

</td>
<td width="50%">
</td>
</tr>
</table>

## Install

**macOS (Homebrew):**

```bash
brew tap zseven-w/openpencil
brew install --cask openpencil
```

**Windows (Scoop):**

```powershell
scoop bucket add openpencil https://github.com/zseven-w/scoop-openpencil
scoop install openpencil
```

**Linux / Windows direct download:** [GitHub Releases](https://github.com/ZSeven-W/openpencil/releases) — `.exe` (Windows), `.AppImage` / `.deb` (Linux)

**CLI (`op`):**

```bash
npm install -g @zseven-w/openpencil
```

## Quick Start (Development)

```bash
# Install dependencies
bun install

# Start dev server at http://localhost:3000
bun --bun run dev
```

Or run as a desktop app:

```bash
bun run electron:dev
```

> **Prerequisites:** [Bun](https://bun.sh/) >= 1.0 and [Node.js](https://nodejs.org/) >= 18. Optional: [Zig](https://ziglang.org/) >= 0.14 for building `agent-native` from source (a prebuilt binary will be downloaded automatically if Zig is not installed).

### Docker

Multiple image variants are available — pick the one that fits your needs:

| Image                        | Size    | Includes             |
| ---------------------------- | ------- | -------------------- |
| `openpencil:latest`          | ~226 MB | Web app only         |
| `openpencil-claude:latest`   | —       | + Claude Code CLI    |
| `openpencil-codex:latest`    | —       | + Codex CLI          |
| `openpencil-opencode:latest` | —       | + OpenCode CLI       |
| `openpencil-copilot:latest`  | —       | + GitHub Copilot CLI |
| `openpencil-gemini:latest`   | —       | + Gemini CLI         |
| `openpencil-full:latest`     | ~1 GB   | All CLI tools        |

**Run (web only):**

```bash
docker run -d -p 3000:3000 ghcr.io/zseven-w/openpencil:latest
```

**Run with AI CLI (e.g. Claude Code):**

The AI chat relies on Claude CLI OAuth login. Use a Docker volume to persist the login session:

```bash
# Step 1 — Login (one-time)
docker volume create openpencil-claude-auth
docker run -it --rm \
  -v openpencil-claude-auth:/root/.claude \
  ghcr.io/zseven-w/openpencil-claude:latest claude login

# Step 2 — Start
docker run -d -p 3000:3000 \
  -v openpencil-claude-auth:/root/.claude \
  ghcr.io/zseven-w/openpencil-claude:latest
```

**Build locally:**

```bash
# Base (web only)
docker build --target base -t openpencil .

# With a specific CLI
docker build --target with-claude -t openpencil-claude .

# Full (all CLIs)
docker build --target full -t openpencil-full .
```

## AI-Native Design

**Prompt to UI**

- **Text-to-design** — describe a page, get it generated on canvas in real-time with SSE streaming animation
- **Orchestrator** — decomposes complex pages into spatial sub-tasks for parallel generation
- **Agent Teams** — concurrent team members with delegate tool, per-member canvas indicators, and fallback strategies
- **Design modification** — select elements, then describe changes in natural language
- **Vision input** — attach screenshots or mockups for reference-based design
- **Style Guides** — apply visual styles (glassmorphism, brutalist, retro, etc.) via tag-based fuzzy matching
- **Anti-slop** — cross-generation diversity tracking to avoid repetitive AI output

**Multi-Agent Support**

| Agent                       | Setup                                                                                             |
| --------------------------- | ------------------------------------------------------------------------------------------------- |
| **Built-in (9+ providers)** | Select from provider presets with region switcher — Anthropic, OpenAI, Google, DeepSeek, and more |
| **Claude Code**             | No config — uses Claude Agent SDK with local OAuth                                                |
| **Codex CLI**               | Connect in Agent Settings (`Cmd+,`)                                                               |
| **OpenCode**                | Connect in Agent Settings (`Cmd+,`)                                                               |
| **GitHub Copilot**          | `copilot login` then connect in Agent Settings (`Cmd+,`)                                          |
| **Gemini CLI**              | Connect in Agent Settings (`Cmd+,`)                                                               |

**Model Capability Profiles** — automatically adapts prompts, thinking mode, and timeouts per model tier. Full-tier models (Claude) get complete prompts; standard-tier (GPT-4o, Gemini, DeepSeek) disable thinking; basic-tier (MiniMax, Qwen, Llama, Mistral) get simplified nested-JSON prompts for maximum reliability.

**i18n** — Full interface localization in 15 languages: English, 简体中文, 繁體中文, 日本語, 한국어, Français, Español, Deutsch, Português, Русский, हिन्दी, Türkçe, ไทย, Tiếng Việt, Bahasa Indonesia.

**MCP Server**

- Built-in MCP server (`pen-mcp` package) — one-click install into Claude Code / Codex / Gemini / OpenCode / Kiro / Copilot CLIs
- Auto-detects Node.js — if not installed, falls back to HTTP transport and auto-starts the MCP HTTP server
- Design automation from terminal: read, create, and modify `.op` files via any MCP-compatible agent
- **Layered design workflow** — `design_skeleton` → `design_content` → `design_refine` for higher-fidelity multi-section designs
- **Segmented prompt retrieval** — load only the design knowledge you need (schema, layout, roles, icons, planning, etc.)
- **Style guide tools** — `get_style_guide_tags` and `get_style_guide` for applying visual styles via MCP
- Multi-page support — create, rename, reorder, and duplicate pages via MCP tools

**Code Generation**

- React + Tailwind CSS, HTML + CSS, CSS Variables
- Vue, Svelte, Flutter, SwiftUI, Jetpack Compose, React Native

## CLI — `op`

Install globally and control the design tool from your terminal:

```bash
npm install -g @zseven-w/openpencil
```

```bash
op start                     # Launch desktop app
op design @landing.txt       # Batch design from file
op insert '{"type":"RECT"}'  # Insert a node
op import:figma design.fig   # Import Figma file
cat design.dsl | op design - # Pipe from stdin
```

Supports three input methods: inline string, `@filepath` (read from file), or `-` (read from stdin). Works with desktop app or web dev server. See [CLI README](./apps/cli/README.md) for full command reference.

**LLM Skill** — install the [OpenPencil Skill](https://github.com/ZSeven-W/openpencil-skill) plugin to teach AI agents (Claude Code, Cursor, Codex, Gemini CLI, etc.) how to design with `op`.

## Features

**Canvas & Drawing**

- Infinite canvas with pan, zoom, smart alignment guides, and snapping
- Rectangle, Ellipse, Line, Polygon, Pen (Bezier), Frame, Text
- Boolean operations — union, subtract, intersect with contextual toolbar
- Icon picker (Iconify) and image import (PNG/JPEG/SVG/WebP/GIF)
- Auto-layout — vertical/horizontal with gap, padding, justify, align
- Multi-page documents with tab navigation

**Design System**

- Design variables — color, number, string tokens with `$variable` references
- Multi-theme support — multiple axes, each with variants (Light/Dark, Compact/Comfortable)
- Component system — reusable components with instances and overrides
- CSS sync — auto-generated custom properties, `var(--name)` in code output
- Reusable UIKits — import/export component kits from `.pen` files

**AI & Agents**

- Prompt-to-canvas with streaming generation and orchestrator-driven spatial decomposition
- Concurrent Agent Teams — multiple designers work on different sections in parallel with per-member canvas indicators
- Layered workflow — `design_skeleton` → `design_content` → `design_refine` with focused prompts per phase
- Style Guides — 50+ built-in styles (glassmorphism, brutalist, retro, etc.) with tag-based fuzzy matching, wired into planning and generation
- Multi-model capability profiles — auto-adapts thinking mode, effort, and prompt shape per model tier
- Built-in agent runtime (`agent-native`, Zig NAPI) + Anthropic, Claude Agent SDK, OpenCode, Codex, Copilot, Gemini providers
- Anthropic-format passthrough for Chinese LLM providers — Kimi, Zhipu, GLM, DouBao, Ark, Bailian/DashScope, ModelScope, Coding Plans

**Git Integration**

- Clone wizard with SSH / HTTPS auth and SSH key management
- Branch picker — create, switch, delete, merge, all from the git panel
- Pull / push cascades with auth retry and non-fast-forward handling
- Folder-mode three-way merge with on-disk `MERGE_HEAD` state tracking
- Conflict panel with per-node / per-field three-way cards, inline JSON editor, bulk actions, and inline diff block
- Remote settings and SSH keys UI; 15-locale i18n across the whole Git surface

**Export**

- Canvas export — PNG, JPEG, WEBP, PDF (`Cmd+Shift+P`)
- Code export — React + Tailwind, HTML + CSS, Vue, Svelte, Flutter, SwiftUI, Jetpack Compose, React Native
- Incremental MCP codegen pipeline — `codegen_plan`, `codegen_submit_chunk`, `codegen_assemble`, `codegen_clean`

**Figma Import**

- Import `.fig` files with layout, fills, strokes, effects, text, images, and vectors preserved

**Desktop App**

- Native macOS, Windows, and Linux via Electron
- `.op` file association — double-click to open, single-instance lock
- Auto-update from GitHub Releases
- Native application menu with Save As, Open Recent, and an unsaved-changes dialog on close
- Recent files persistence

## Tech Stack

|                 |                                                                                         |
| --------------- | --------------------------------------------------------------------------------------- |
| **Frontend**    | React 19 · TanStack Start · Tailwind CSS v4 · shadcn/ui · i18next                       |
| **Canvas**      | CanvasKit/Skia (WASM, GPU-accelerated)                                                  |
| **Engine**      | pen-engine (headless) · pen-react (React UI SDK)                                        |
| **State**       | Zustand v5                                                                              |
| **Server**      | Nitro                                                                                   |
| **Desktop**     | Electron 35                                                                             |
| **CLI**         | `op` — terminal control, batch design DSL                                               |
| **AI**          | agent-native (Zig NAPI) · Anthropic SDK · Claude Agent SDK · OpenCode SDK · Copilot SDK |
| **Runtime**     | Bun · Vite 7                                                                            |
| **Lint**        | oxlint · oxfmt                                                                          |
| **File format** | `.op` — JSON-based, human-readable, Git-friendly                                        |

## Project Structure

```text
openpencil/
├── apps/
│   ├── web/                 TanStack Start web app
│   │   ├── src/
│   │   │   ├── canvas/      CanvasKit/Skia engine — drawing, sync, layout
│   │   │   ├── components/  React UI — editor, panels, shared dialogs, icons
│   │   │   ├── services/ai/ AI chat, orchestrator, design generation, streaming
│   │   │   ├── services/codegen/ Code generation service wrappers
│   │   │   ├── stores/      Zustand — canvas, document, pages, history, AI
│   │   │   ├── hooks/       Keyboard shortcuts, file drop, Figma paste, MCP sync
│   │   │   ├── i18n/        Internationalization — 15 locales
│   │   │   └── uikit/       Reusable component kit system
│   │   └── server/
│   │       ├── api/ai/      Nitro API — streaming chat, agent, generation, image search
│   │       ├── api/mcp/     MCP HTTP transport endpoints
│   │       └── utils/       Claude, OpenCode, Codex, Copilot, Gemini CLI wrappers
│   ├── desktop/             Electron desktop app
│   │   ├── main.ts          Window, Nitro fork, native menu, auto-updater
│   │   ├── ipc-handlers.ts  Native file dialogs, theme sync, prefs IPC
│   │   └── preload.ts       IPC bridge
│   └── cli/                 CLI tool — `op` command
│       ├── src/commands/    Design, document, export, import, node, page, variable commands
│       ├── connection.ts    WebSocket connection to running app
│       └── launcher.ts      Auto-detect and launch desktop app or web server
├── packages/
│   ├── pen-types/           Type definitions for PenDocument model
│   ├── pen-core/            Document tree ops, layout engine, variables
│   ├── pen-engine/          Headless design engine — document, selection, history, viewport
│   ├── pen-react/           React UI SDK — provider, canvas, hooks, panels, toolbar
│   ├── pen-codegen/         Code generators (React, HTML, Vue, Flutter, ...)
│   ├── pen-figma/           Figma .fig file parser and converter
│   ├── pen-renderer/        Standalone CanvasKit/Skia renderer
│   ├── pen-mcp/             MCP server — tools, routes, document manager
│   ├── pen-sdk/             Umbrella SDK (re-exports all packages)
│   ├── pen-ai-skills/       AI prompt skill engine (phase-driven prompt loading)
│   └── agent-native/        Native AI agent runtime (Zig NAPI, multi-provider, teams)
└── .githooks/               Pre-commit version sync from branch name
```

## Keyboard Shortcuts

| Key         | Action            |     | Key           | Action                    |
| ----------- | ----------------- | --- | ------------- | ------------------------- |
| `V`         | Select            |     | `Cmd+S`       | Save                      |
| `R`         | Rectangle         |     | `Cmd+Z`       | Undo                      |
| `O`         | Ellipse           |     | `Cmd+Shift+Z` | Redo                      |
| `L`         | Line              |     | `Cmd+C/X/V/D` | Copy/Cut/Paste/Duplicate  |
| `T`         | Text              |     | `Cmd+G`       | Group                     |
| `F`         | Frame             |     | `Cmd+Shift+G` | Ungroup                   |
| `P`         | Pen tool          |     | `Cmd+Shift+P` | Export (PNG/JPG/WEBP/PDF) |
| `H`         | Hand (pan)        |     | `Cmd+Shift+C` | Code panel                |
| `Del`       | Delete            |     | `Cmd+Shift+V` | Variables panel           |
| `[ / ]`     | Reorder           |     | `Cmd+J`       | AI chat                   |
| Arrows      | Nudge 1px         |     | `Cmd+,`       | Agent settings            |
| `Cmd+Alt+U` | Boolean union     |     | `Cmd+Alt+S`   | Boolean subtract          |
| `Cmd+Alt+I` | Boolean intersect |     | `Cmd+Shift+S` | Save As                   |

## Scripts

```bash
bun --bun run dev          # Dev server (port 3000)
bun --bun run build        # Production build
bun --bun run test         # Run tests (Vitest)
npx tsc --noEmit           # Type check
bun run lint               # Lint (oxlint)
bun run format             # Format (oxfmt)
bun run bump <version>     # Sync version across all package.json
bun run electron:dev       # Electron dev
bun run electron:build     # Electron package
bun run cli:dev            # Run CLI from source
bun run cli:compile        # Compile CLI to dist
bun run mcp:dev            # Run MCP server from source
```

## Contributing

Contributions are welcome! See [CLAUDE.md](./CLAUDE.md) for architecture details and code style.

1. Fork and clone
2. Set up version sync: `git config core.hooksPath .githooks`
3. Create a branch: `git checkout -b feat/my-feature`
4. Run checks: `npx tsc --noEmit && bun --bun run test`
5. Commit with [Conventional Commits](https://www.conventionalcommits.org/): `feat(canvas): add rotation snapping`
6. Open a PR against `main`

## Roadmap

- [x] Design variables & tokens with CSS sync
- [x] Component system (instances & overrides)
- [x] AI design generation with orchestrator
- [x] MCP server integration with layered design workflow
- [x] Multi-page support
- [x] Figma `.fig` import
- [x] Boolean operations (union, subtract, intersect)
- [x] Multi-model capability profiles
- [x] Monorepo restructure with reusable packages
- [x] CLI tool (`op`) for terminal control
- [x] Built-in AI agent SDK with multi-provider support
- [x] i18n — 15 languages
- [x] Headless design engine (`pen-engine`) + React UI SDK (`pen-react`)
- [x] Style Guides with tag-based matching and MCP tools
- [x] Concurrent Agent Teams with delegate tool and canvas indicators
- [x] Native agent runtime (`agent-native` — Zig NAPI)
- [x] Git integration — clone, branch, push/pull, folder-mode three-way merge
- [x] Canvas raster export (PNG / JPEG / WEBP / PDF)
- [ ] Collaborative editing
- [ ] Plugin system

## Contributors

<a href="https://github.com/ZSeven-W/openpencil/graphs/contributors">
  <img src="https://contrib.rocks/image?repo=ZSeven-W/openpencil" alt="Contributors" />
</a>

## Sponsors

OpenPencil is free and open-source. Development is funded by people who find it useful — thank you for keeping the canvas open.

<a href="https://github.com/mrqyun" title="MrQyun">
  <img src="https://wsrv.nl/?url=github.com/mrqyun.png&w=128&h=128&mask=circle&maxage=7d" width="64" height="64" alt="MrQyun" />
</a>

Thanks to **[MrQyun](https://github.com/mrqyun)** — want your name here too? **[Become a sponsor →](https://github.com/sponsors/ZSeven-W)**

## Community

<a href="https://discord.gg/h9Fmyy6pVh">
  <img src="./apps/web/public/logo-discord.svg" alt="Discord" width="16" />
  <strong> Join our Discord</strong>
</a>
— Ask questions, share designs, suggest features.

## Star History

<a href="https://star-history.com/#ZSeven-W/openpencil&Date">
 <picture>
   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=ZSeven-W/openpencil&type=Date&theme=dark" />
   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=ZSeven-W/openpencil&type=Date" />
   <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=ZSeven-W/openpencil&type=Date" width="100%" />
 </picture>
</a>

## Assessments

[![MseeP.ai Security Assessment Badge](https://mseep.net/pr/zseven-w-openpencil-badge.png)](https://mseep.ai/app/zseven-w-openpencil)

## License

[MIT](./LICENSE) — Copyright (c) 2026 ZSeven-W
