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3D Model Viewer vs CAD Assistant: catalog facts
3D Model Viewer	CAD Assistant
Free Free and open source under the MIT licence.	Free Free for personal and commercial use.
Android	macOS, Android
Opens OBJ, STL and DAE files Readable source code useful for learning OpenGL	Opens STEP, IGES and other CAD formats Converts between 3D formats
Deliberately basic feature set Viewing only, no editing	Viewer and converter only, not a modelling tool Closed source despite being built on the open OCCT kernel
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is 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 October 1, 2026

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