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AllDup vs fclones: catalog facts
AllDup	fclones
Free Freeware, free for private users and companies.	Free Free and open source under the MIT licence.
Windows	Linux, Command line
Many comparison methods, including similar images and music Scans inside ZIP, RAR and 7Z archives	Finds duplicates by file content, not by name Many options for limiting the search scope
Windows only Closed source	Command-line only unless you install the separate GUI Removing files by mistake is easy without a backup
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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