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fstl-e vs 3D Model Viewer: catalog facts
fstl-e	3D Model Viewer
Free Free and open source under the MIT licence.	Free Free and open source under the MIT licence.
Linux	Android
Opens STL files quickly Configurable background	Opens OBJ, STL and DAE files Readable source code useful for learning OpenGL
Viewer only, no editing Small fork maintained by one developer	Deliberately basic feature set Viewing only, no editing
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
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.