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PrivaZer vs Sifty: catalog facts
PrivaZer	Sifty
Freemium A free edition is available. PrivaZer PRO adds features for contributors.	Free Free and open source under the MIT licence.
Windows	Windows, Command line
Shows exactly what it will remove before doing anything Optional secure overwriting of freed space	Dry-run by default with a preview before deleting Deletes only to the Recycle Bin, with undo
Aggressive cleaning options can remove things you wanted to keep	Windows 10 and 11 only Terminal interface, no graphical window
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
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 2, 2026

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