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CAD Assistant vs fstl-e: catalog facts
CAD Assistant	fstl-e
Free Free for personal and commercial use.	Free Free and open source under the MIT licence.
macOS, Android	Linux
Opens STEP, IGES and other CAD formats Converts between 3D formats	Opens STL files quickly Configurable background
Viewer and converter only, not a modelling tool Closed source despite being built on the open OCCT kernel	Viewer only, no editing Small fork maintained by one developer
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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