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