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Portacle vs Roswell: catalog facts
Portacle	Roswell
Best for: Common Lisp learners and developers who want a ready-to-use environment	Best for: Setting up and switching Common Lisp implementations
Free Free to download.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Windows, Command line
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	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
The bundled editor is Emacs, which has its own learning curve	Command-line only Aimed at Common Lisp, not other Lisp dialects
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for Portacle portacle.github.io Catalog checked October 8, 2026	Official website Full listing and sources Sources for Roswell github.com/roswell/roswell Catalog checked October 2, 2026

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