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Czkawka vs AllDup: catalog facts
Czkawka	AllDup
Free Free and open source under the MIT licence, with no advertising.	Free Freeware, free for private users and companies.
Windows, macOS, Linux, Android	Windows
Finds duplicates, similar images, similar videos and similar music Written in Rust and multithreaded, with caching for repeat scans	Many comparison methods, including similar images and music Scans inside ZIP, RAR and 7Z archives
The Czkawka GTK interface ends at 12.0; new work goes to Krokiet Similar-image matching produces false positives you must review	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 21, 2026	Official website Full listing and sources Checked September 24, 2026

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