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Online 3D Viewer vs 3D Model Viewer: catalog facts
Online 3D Viewer	3D Model Viewer
Free Free and open source.	Free Free and open source under the MIT licence.
Web	Android
Opens many 3D and CAD formats, including STEP, IFC and FBX Runs in the browser with no install	Opens OBJ, STL and DAE files Readable source code useful for learning OpenGL
A viewer only, not a modeling tool	Deliberately basic feature set Viewing only, no editing
Web application	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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