OpenPencil

Open-source, AI-native design editor. Figma alternative built from scratch with full .fig file compatibility.

Status: Active development. Not ready for production use.

Features

• Figma .fig file import — open native Figma files directly
• Figma clipboard — copy/paste between OpenPencil and Figma
• Vector networks — complex boolean shapes and open paths, like Figma
• Auto-layout — constraint-based layout matching Figma behavior
• Components & instances — with live sync, overrides, component sets
• Pen tool — bezier curves with tangent handles
• Inline text editing — multi-line text with system fonts
• Undo/redo — all operations are undoable
• Snap guides — edge and center snapping
• Color picker — HSV, hue/alpha sliders, hex input, gradients
• ~5 MB install, works fully offline — no account, no server, no internet required

Tech Stack

Layer	Tech
UI	Vue 3, VueUse, Reka UI
Styling	Tailwind CSS 4
Rendering	Skia (CanvasKit WASM)
Layout	Yoga WASM
File format	Kiwi binary (vendored) + Zstd + ZIP
Color	culori
Desktop	Tauri v2
Testing	Playwright (visual regression), bun:test (unit)
Tooling	Vite 7, oxlint, oxfmt, typescript-go

Getting Started

bun install
bun run dev

Scripts

Command	Description
bun run dev	Dev server at http://localhost:1420
bun run build	Production build
bun run check	Lint + typecheck
bun run test	E2E visual regression
bun run test:update	Regenerate screenshot baselines
bun run test:unit	Unit tests
bun run tauri dev	Desktop app (requires Rust)

Desktop App

Requires Rust, the Tauri CLI, and platform-specific prerequisites (Tauri v2 guide).

bun run tauri dev                      # Dev mode with hot reload
bun run tauri build                    # Production build
bun run tauri build --target universal-apple-darwin  # macOS universal

Cross-compilation to other platforms requires their respective toolchains or CI (e.g. GitHub Actions).

Platform Prerequisites

macOS

Install Xcode Command Line Tools:

xcode-select --install

Windows

1. Install Rust — make sure the default toolchain is stable-msvc:

   rustup default stable-msvc
   

2. Install Visual Studio Build Tools with the "Desktop development with C++" workload (MSVC compiler + Windows SDK)
3. WebView2 is pre-installed on Windows 10 (1803+) and Windows 11. If missing, download from Microsoft

Linux

Install system dependencies (Debian/Ubuntu):

sudo apt install libwebkit2gtk-4.1-dev build-essential curl wget file \
  libxdo-dev libssl-dev libayatana-appindicator3-dev librsvg2-dev

For other distros, see the Tauri v2 prerequisites.

Project Structure

src/
  components/     Vue SFCs (canvas, panels, toolbar, color picker)
  composables/    Canvas input, keyboard shortcuts, rendering
  stores/         Editor state (Vue reactivity)
  engine/         Scene graph, renderer, layout, clipboard, undo, vector, snap
  kiwi/           Figma file format (Kiwi codec, .fig import)
    kiwi-schema/  Vendored from evanw/kiwi
  types.ts        Shared types
  constants.ts    UI colors, defaults, thresholds
desktop/          Tauri v2 (Rust + config)
tests/
  e2e/            Playwright visual regression
  engine/         Unit tests

License

MIT