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F3D vs Mayo: catalog facts
F3D	Mayo
Free Free and open source.	Free Free and open source.
Web	Windows, macOS, Linux
Opens many 3D and CAD formats in one viewer Gaussian splatting and volume rendering support	Converts between STEP, IGES, STL and other CAD formats Clip planes, exploded views and measurement
A viewer, not an editor Minimal interface with few editing features	A viewer and converter, not a modelling tool
Downloadable app, Web application	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account 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 September 23, 2026

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