Tau

The AI-native CAD platform — open-source, browser-based, and kernel-agnostic. Design anything from 3D prints, game assets, and more.

Try it now at tau.new

Features

• Open Source — Apache-2.0 across the complete Tau codebase (see Licensing)
• Browser-Based — Run CAD on mobile or desktop, no installation required
• Code-Based CAD — Precise, version-controlled designs through code
• AI-Powered — Natural language interface for design creation and modification
• Parametric Editor — Adjustable parameters with real-time preview
• Multi-Kernel — Choose the right CAD engine for your project
• Embeddable — Components to bring CAD into any web application
• Runs Outside Tau — Every project keeps its ecosystem's own files (package.json, pyproject.toml, a .csproj), so it runs with npm ci, uv, dotnet, OpenSCAD or the Zoo CLI; the standalone-project jobs (Linux, macOS; sources ci.yml, native-darwin.yml) check each template against Tau's own export on every push to main

Use Cases

• 3D Printing — Design and export to STL, 3MF, and slicer-compatible formats
• Game Development — Create 3D models for games and simulations
• Industrial Design — Create 3D models for industrial design and manufacturing
• CAD Prototyping — Parametric code with version control and instant iteration
• Academic Research — Kernel APIs for computational geometry and educational tools

Supported Integrations

Tau's multi-kernel architecture lets you choose the best engine for your needs. We support mechanical CAD and electrical design, with plans to expand into firmware development and simulation.

Category	Type	Implemented	Planned
Mechanical	CAD	• OpenRSCAD• Replicad• Manifold• Zoo (KCL)• JSCAD• OpenCascade (direct libcascade)• Build123D (Desktop)• PicoGK (ShapeKernel) (Desktop)• PicoVoxel	• OnShape• Fusion360• Curv• ClassCAD• Truck
	Sim	—	• FEAScript
Electrical	CAD	• TSCircuit

File Converter

Convert between 39 input formats and 14 output formats including STL, STEP, GLTF, FBX, 3MF, OBJ, USDZ, and more.

Community

• Discord — Join our community
• Documentation — tau.new/docs
• GitHub Discussions — Ask questions and share ideas

Contributing

We welcome contributions! Please see our Contributing Guide for development setup and guidelines.

Security

For security concerns, please review our Security Policy.

Code of Conduct

Please read our Code of Conduct before participating.

Built With

Tau is built on a foundation of excellent open-source projects:

Category	Technologies
State Management	XState v6
UI Framework	React 19, React Router, Radix UI, shadcn/ui, Tailwind CSS
Workspace Layout	Dockview
Code Editor	CodeMirror, Shiki
3D Rendering	Three.js, React Three Fiber
AI Agents	Pi, AI SDK
API	NestJS, Fastify, Better Auth
Database	Drizzle ORM

Special thanks to OpenSCAD Playground for inspiring the browser-based code-CAD architecture.

License

All Tau-authored code is Apache-2.0, including the applications, internal libraries, tools, examples, published packages, and the GeoSpec engine. It may be forked, modified, embedded, hosted, and redistributed, including commercially, subject to the Apache licence and notice requirements.

See Licensing for repository-wide details, previous-release treatment, and third-party notices.

Full third-party license inventory: third-party licenses.