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Mac Sai vs Disk Diet: catalog facts
Mac Sai	Disk Diet
Free Free and open source.	Paid One-time purchase with no subscription, listed at $2 on the product page.
macOS	macOS
Cleaner, optimizer and malware scanner in one app Apple-notarized builds	Targets many common clutter locations in one scan Includes Xcode developer folders and old iOS updates
macOS only Young project from a single maintainer	macOS only Requires macOS 11.5 or later
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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 October 2, 2026

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