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crabz vs GNU Gzip: catalog facts
crabz	GNU Gzip
Free Free and open source, dual-licensed under MIT and the Unlicense.	Free Free software from the GNU Project.
macOS, Linux, Command line	Linux, Command line
Multi-threaded compression in the style of pigz Supports Gzip, Zlib, BGZF, Mgzip, raw Deflate and Snap	Available on nearly every Unix-like system The .gz format is read almost everywhere
Described by its author as a proof of concept Handles single streams, not archive formats like ZIP or 7z	Compresses single files or streams, not multi-file archives Lower compression ratio than xz, zstd or lzip
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Unlicense	License: GPL-3.0-or-later
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 23, 2026

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