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F3D vs CAD Assistant: catalog facts
F3D	CAD Assistant
Free Free and open source.	Free Free for personal and commercial use.
Web	macOS, Android
Opens many 3D and CAD formats in one viewer Gaussian splatting and volume rendering support	Opens STEP, IGES and other CAD formats Converts between 3D formats
A viewer, not an editor Minimal interface with few editing features	Viewer and converter only, not a modelling tool Closed source despite being built on the open OCCT kernel
Downloadable app, Web application	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.