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GNU Guile vs Janet: catalog facts
GNU Guile	Janet
Free Free software under the LGPL 3.0 or later.	Free Free and open source under the MIT licence.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Works both as a standalone language and an embeddable extension language Broad Scheme standards support, including many SRFIs	Entire language under 1MB in one binary Threads, networking and an event loop built in
Scheme syntax is unfamiliar to many programmers Smaller ecosystem than mainstream scripting languages	Smaller package ecosystem than mainstream scripting languages Lisp-style syntax takes adjustment for newcomers
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-3.0-or-later	License: MIT
No account 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 2, 2026

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