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Lem vs Neovim: catalog facts
Lem	Neovim
Free Free and open source.	Free Free and open source under the Apache 2.0 licence, with some parts under the Vim licence.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Extensible in Common Lisp while running Emacs-like and Vim-like modes	Built-in LSP client for semantic code inspection and refactoring Tree-sitter parsing for fast, accurate highlighting, navigation and text objects
Extending it requires learning Common Lisp GUI is in transition from SDL2 to a webview version	Modal editing is a real learning curve if you have not used Vim A usable setup usually means assembling plugins or adopting someone else’s configuration
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
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 20, 2026

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