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Online 3D Viewer vs fstl-e: catalog facts
Online 3D Viewer	fstl-e
Free Free and open source.	Free Free and open source under the MIT licence.
Web	Linux
Opens many 3D and CAD formats, including STEP, IFC and FBX Runs in the browser with no install	Opens STL files quickly Configurable background
A viewer only, not a modeling tool	Viewer only, no editing Small fork maintained by one developer
Web application	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	No account 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.