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Roswell vs Portacle: catalog facts
Roswell	Portacle
Best for: Setting up and switching Common Lisp implementations	Best for: Common Lisp learners and developers who want a ready-to-use environment
Free Free and open source under the MIT licence.	Free Free to download.
Windows, Command line	Windows, macOS, Linux
Installs and switches between Common Lisp implementations Doubles as a launcher for Lisp programs All 3 strengths for Roswell Installs and switches between Common Lisp implementations Doubles as a launcher for Lisp programs Long-running project with active commits	Bundles a Lisp implementation and package manager Portable folder-based setup All 3 strengths for Portacle Bundles a Lisp implementation and package manager Portable folder-based setup Available for Windows, macOS and Linux
Command-line only Aimed at Common Lisp, not other Lisp dialects	The bundled editor is Emacs, which has its own learning curve
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for Roswell github.com/roswell/roswell Catalog checked October 2, 2026	Official website Full listing and sources Sources for Portacle portacle.github.io Catalog checked October 8, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.