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Lem vs Spacemacs: catalog facts
Lem	Spacemacs
Free Free and open source.	Free Free, community-maintained configuration for Emacs.
macOS, Linux, Command line	Windows, macOS, Linux
Extensible in Common Lisp while running Emacs-like and Vim-like modes	Vim key bindings on top of the Emacs package ecosystem Mnemonic, consistent key bindings with a live key hint display
Extending it requires learning Common Lisp GUI is in transition from SDL2 to a webview version	Requires Emacs to be installed separately Large configuration can make startup and troubleshooting slower
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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