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AllDup vs dupeGuru: catalog facts
AllDup	dupeGuru
Free Freeware, free for private users and companies.	Free Free and open source under the GPL 3.0.
Windows	Windows, macOS, Linux
Many comparison methods, including similar images and music Scans inside ZIP, RAR and 7Z archives	Fuzzy image matching finds resized and re-encoded copies Separate music mode that compares tags rather than bytes
Windows only Closed source	Last release was July 2022 and the project is asking for maintainers Fuzzy matching is slow on very large photo collections
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: GPL-3.0
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 21, 2026

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