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crabz vs Zopfli: catalog facts
crabz	Zopfli
Free Free and open source, dual-licensed under MIT and the Unlicense.	Free Free and open source from Google.
macOS, Linux, Command line	Command line
Multi-threaded compression in the style of pigz Supports Gzip, Zlib, BGZF, Mgzip, raw Deflate and Snap	Smaller output than standard gzip at its highest level Output readable by any gzip, zlib or deflate decoder
Described by its author as a proof of concept Handles single streams, not archive formats like ZIP or 7z	Much slower than ordinary compressors Compresses only; decompression uses standard tools
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Unlicense	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 October 2, 2026

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