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N3XD documentation

N3XD is a parametric 3D CAD application. A web UI sits on top of an OpenCASCADE geometry kernel, so you get full-strength modeling in the browser with nothing to install. It is also AI-aware: the command pipeline the UI drives is open to an LLM, in-app or over the MCP server.

This site is the user guide for building models with N3XD.

  • User Guide

    How-to for people building models: sketching, features, assemblies, simulation, import and export. Start with Getting started.

What you can build

Parts from constrained 2D sketches and 3D features (extrude, revolve, loft, sweep, fillet, chamfer, shell, draft, thread, hole, patterns and more), multi-part assemblies held together by mates, named parameters and configurations, materials, linear-static stress simulation, CFD flow studies, and STEP / STL / 3MF export. The feature guide has the full set.

Open source and self-hostable

The CAD core in ./app is open source. Run it locally with two commands (see Getting started) or deploy the Docker image. Authentication, project ownership and sharing live in a separate business layer and are out of scope here.