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Mac Sai vs OnyX: catalog facts
Mac Sai	OnyX
Free Free and open source.	Free Free to use; the developer accepts donations.
macOS	macOS
Cleaner, optimizer and malware scanner in one app Apple-notarized builds	Many maintenance tasks without typing Terminal commands Access to hidden settings in Finder, Dock and Safari
macOS only Young project from a single maintainer	Each version works only with one macOS release Latest version requires an Apple silicon Mac
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it 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 23, 2026

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