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Online 3D Viewer vs CAD Assistant: catalog facts
Online 3D Viewer	CAD Assistant
Free Free and open source.	Free Free for personal and commercial use.
Web	macOS, Android
Opens many 3D and CAD formats, including STEP, IFC and FBX Runs in the browser with no install	Opens STEP, IGES and other CAD formats Converts between 3D formats
A viewer only, not a modeling tool	Viewer and converter only, not a modelling tool Closed source despite being built on the open OCCT kernel
Web application	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account 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.