Image Snooper download

It can easily find all the images in a folder that resemble the search image.
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Download on the Mac App Store

Alternative apps

PhotoSweeper
PhotoSweeper
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Find and delete photo duplicates from your Mac computer.

SnapFlow
SnapFlow
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Note: According to the developer, SnapFlow has been discontinued.

Duplicate Image Detector
Duplicate Image Detector
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Locates all duplicate images from any folder within your Mac.

Duplicate Photo Cleaner
Duplicate Photo Cleaner
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Find duplicate image files using different scan modes.

Image Comparitor
Image Comparitor
Free
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Its designed to compare image files inside a folder for duplicate images