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

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