Free engineering software, built by engineers
Tools we built for our own consulting work, released free for the engineering community. No accounts, no trials — download and work.
Pro3DWorks
Open any CAD model. Free. Straight in your browser. Pro3DWorks is a complete viewer and inspection suite in a single HTML file — drop in a STEP, Parasolid or STL and you are measuring, sectioning and rendering in seconds.
v2.53.0 · single HTML file · ~9 MB · Windows / Mac / Linux · works offline
Getting started — 30 seconds
- Download and save Pro3DWorks.html anywhere.
- Double-click it — it opens in your browser like a normal app.
- Drag a CAD file in, or press Load demo assembly.
Opens the formats that matter
STEP, IGES, STL, Parasolid (.x_t), 3MF, GLB, OBJ and more — including large assemblies, with an instant reopen cache.
Real inspection tools
Measure vertices, edges and faces; section views; exploded views; mass properties; interference checks; model scaling.
Photoreal rendering
Ray-traced studio images and 4K exports — presentation-grade output straight from a browser tab.
AI Engineer built in
Identify components, color by function, generate a BOM with order-of-magnitude cost estimates (exported as a formatted Excel workbook), review the design, or chat with your model. Works with any OpenAI-compatible endpoint — or fully local and private with LM Studio.
Estimates your cost savings — AI vs. manual labor
Every AI run is metered in real dollars, and the built-in cost & savings log estimates what the same work would cost an engineer doing it by hand, at your own labor rate. Each model session becomes a line item — AI cost, manual estimate, and money saved — with a running total.
Private by design
One HTML file that runs entirely on your machine. No install, no account, no upload — your models never leave your computer.
More tools on the way
The Combustion Engineering Toolkit and our 1-D compressible flow network simulator are next in line to join this page.
Need the engineers behind the tools?
The same team that builds this software designs, tests and troubleshoots gas turbine combustion and thermal-fluid systems for clients worldwide.