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p7zip vs unar: catalog facts
p7zip	unar
Free Free and open source.	Free Free and open source under the LGPL.
macOS, Linux, Command line	Windows, macOS, Linux, Command line
Brings 7-Zip's strong compression ratios to Linux and macOS from the command line Widely bundled in Linux distributions, so it's readily available	Same format support as The Unarchiver, in a terminal Runs on macOS, Windows and Linux
Command-line only, no bundled graphical interface Development has slowed compared to the original Windows 7-Zip project	Windows build is slightly outdated No graphical app outside macOS
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: LGPL-2.1-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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