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Mayo vs 3D Model Viewer: catalog facts
Mayo	3D Model Viewer
Free Free and open source.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Android
Converts between STEP, IGES, STL and other CAD formats Clip planes, exploded views and measurement	Opens OBJ, STL and DAE files Readable source code useful for learning OpenGL
A viewer and converter, not a modelling tool	Deliberately basic feature set Viewing only, no editing
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
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.