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CAD Assistant vs Mayo: catalog facts
CAD Assistant	Mayo
Free Free for personal and commercial use.	Free Free and open source.
macOS, Android	Windows, macOS, Linux
Opens STEP, IGES and other CAD formats Converts between 3D formats	Converts between STEP, IGES, STL and other CAD formats Clip planes, exploded views and measurement
Viewer and converter only, not a modelling tool Closed source despite being built on the open OCCT kernel	A viewer and converter, not a modelling tool
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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