The AI-native CAD platform — open-source, browser-based, and kernel-agnostic. Design anything from 3D prints, game assets, and more.
🚧 Tau is currently under heavy development. APIs and interfaces may change as we add new features and improvements.
- Open Source — MIT licensed
- 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
- 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
Tau's multi-kernel architecture lets you choose the best engine for your needs. We're currently focused on mechanical CAD, with plans to expand into electrical design, firmware development, and simulation.
| Category | Type | Implemented | Planned |
|---|---|---|---|
| Mechanical | CAD | • OpenSCAD • Replicad • Zoo (KCL) • JSCAD |
• OnShape • Fusion360 • Build123D • ManifoldCAD • Curv • PicoGK (ShapeKernel) • Buerli (ClassCAD) |
| Sim | — | • FEAScript | |
| Electrical | CAD | — | • TSCircuit • Atopile |
| Sim | — | • ngspice • CircuitJS |
|
| Firmware | CAD | — | • Arduino • MicroPython |
| Sim | — | • QEMU • Wokwi |
Convert between 41 input formats and 11 output formats including STL, STEP, GLTF, FBX, 3MF, OBJ, and more.
- Discord — Join our community
- Documentation — tau.new/docs
- GitHub Discussions — Ask questions and share ideas
We welcome contributions! Please see our Contributing Guide for development setup and guidelines.
For security concerns, please review our Security Policy.
Please read our Code of Conduct before participating.
Tau is built on a foundation of excellent open-source projects:
| Category | Technologies |
|---|---|
| State Management | XState V5 |
| Code Editor | Monaco Editor |
| 3D Rendering | Three.js, React Three Fiber |
| UI Framework | React 19, Radix UI, shadcn/ui |
| File Tree | Headless Tree |
| AI Orchestration | LangChain |
| 3D Processing | glTF-Transform, Assimp |
| CAD Kernels | OpenCascade.js (via Replicad) |
| Documentation | Fumadocs |
| Database | Drizzle ORM |
| Git Operations | Isomorphic Git |
Special thanks to OpenSCAD Playground for inspiring the browser-based code-CAD architecture.
Tau is dual-licensed:
- MIT License — For all components except the OpenSCAD kernel
- GPL-2.0-or-later — When using the OpenSCAD kernel
If you use Tau without the OpenSCAD kernel (e.g., only Replicad, Zoo, or JSCAD), the entire codebase is available under the permissive MIT License. If you use Tau with the OpenSCAD kernel, the combined work is subject to GPL-2.0-or-later terms due to the openscad-wasm-prebuilt dependency.
Third-party license information is available in license-deps.