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Mayo vs Online 3D Viewer: catalog facts
Mayo	Online 3D Viewer
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux	Web
Converts between STEP, IGES, STL and other CAD formats Clip planes, exploded views and measurement	Opens many 3D and CAD formats, including STEP, IFC and FBX Runs in the browser with no install
A viewer and converter, not a modelling tool	A viewer only, not a modeling tool
Downloadable app	Web application
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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