Does not work against iPhoto library
This application can only work against folders accessible via Finder. This means it cannot access your iPhoto library folders. The program does work as advertised, but some people may be unaware that it wont help remove duplicates from iPhoto.
Edit (June 2014): In response to the review by Bixter - Good luck getting your average Mac user to figure out exactly where they’ll find their photos within the iPhoto Library package and not screw it up. A much better photo duplicate remover that actually understand iPhoto without having to mess around with package contents is Duplifinder, by Haystack Software.
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Photos Duplicate Cleaner, v1.3