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rapidgzip vs crabz: catalog facts
rapidgzip	crabz
Free Free and open source, dual-licensed under MIT and Apache 2.0.	Free Free and open source, dual-licensed under MIT and the Unlicense.
Command line	macOS, Linux, Command line
Parallel decompression of ordinary gzip files Fast random access into compressed files	Multi-threaded compression in the style of pigz Supports Gzip, Zlib, BGZF, Mgzip, raw Deflate and Snap
Focused on decompression of gzip only Benefits depend on having many CPU cores	Described by its author as a proof of concept Handles single streams, not archive formats like ZIP or 7z
Downloadable app	Downloadable app
Open source	Open source
License: MIT OR Apache-2.0	License: MIT OR Unlicense
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 September 23, 2026

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