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Review of PhotoKilter powered by the Slant community.
PhotoKilter is a folder based image viewer for Mac with the most essential photo enhancement and filtering tools.
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Pros
Pro Side-by-side photo comparison
Allows to compare different photos using the special Dual Preview mode.
Pro Supports a wide range of systems, from 10.13 to the latest
Cons
Con No longer avaliable in the App Store.
Now you can download it directly from the site - https://photokilter.business.site