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Zstandard vs rapidgzip: catalog facts
Zstandard	rapidgzip
Free Free and open source, dual licensed BSD or GPLv2.	Free Free and open source, dual-licensed under MIT and Apache 2.0.
Windows, macOS, Linux, Command line	Command line
Compression close to zlib's ratio at several times the speed, and much faster decompression The format is standardised in RFC 8878 with multiple independent implementations	Parallel decompression of ordinary gzip files Fast random access into compressed files
A command-line tool with no graphical interface of its own Maximum ratio is below xz or 7z at their slowest settings, which is the trade it makes on…	Focused on decompression of gzip only Benefits depend on having many CPU cores
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: MIT OR Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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