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Chez Scheme vs GNU Guile: catalog facts
Chez Scheme	GNU Guile
Free Free and open source under the Apache 2.0 licence.	Free Free software under the LGPL 3.0 or later.
Windows, Command line	macOS, Linux, Command line
Complete Scheme implementation with compiler and tools Regular versioned releases with detailed release notes	Works both as a standalone language and an embeddable extension language Broad Scheme standards support, including many SRFIs
Scheme is a niche language with a smaller ecosystem Homepage offers little introductory material	Scheme syntax is unfamiliar to many programmers Smaller ecosystem than mainstream scripting languages
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: LGPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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