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