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F3D vs fstl-e: catalog facts
F3D	fstl-e
Free Free and open source.	Free Free and open source under the MIT licence.
Web	Linux
Opens many 3D and CAD formats in one viewer Gaussian splatting and volume rendering support	Opens STL files quickly Configurable background
A viewer, not an editor Minimal interface with few editing features	Viewer only, no editing Small fork maintained by one developer
Downloadable app, Web application	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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