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CAD Assistant vs Online 3D Viewer: catalog facts
CAD Assistant	Online 3D Viewer
Free Free for personal and commercial use.	Free Free and open source.
macOS, Android	Web
Opens STEP, IGES and other CAD formats Converts between 3D formats	Opens many 3D and CAD formats, including STEP, IFC and FBX Runs in the browser with no install
Viewer and converter only, not a modelling tool Closed source despite being built on the open OCCT kernel	A viewer only, not a modeling tool
Downloadable app	Web application
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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