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Windows build is slightly outdated No graphical app outside macOS	Command-line only, no bundled graphical interface Development has slowed compared to the original Windows 7-Zip project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

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