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Autodesk Viewer vs CAD Assistant: catalog facts
Autodesk Viewer	CAD Assistant
Free Free to use in the browser.	Free Free for personal and commercial use.
Web	macOS, Android
Opens many CAD formats, including DWG, RVT, STEP and SolidWorks files No software to install	Opens STEP, IGES and other CAD formats Converts between 3D formats
Requires a WebGL-capable browser A viewer only, not an editor	Viewer and converter only, not a modelling tool Closed source despite being built on the open OCCT kernel
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	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.