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

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