A True Duplicate / Similar Image Finder.

Just drag and drop any image folders from Finder or events from iPhoto on your local drive onto Unik. Then Unik will start comparing. You can simply add more images whenever you want and detect duplicates. It's that easy.

Unik compares not the binary data but the image contents, so that you can find truly similar images regardless of file types, resolutions, directions and color saturations.

◦ Caching for fast access later
◦ Adjustable similarity threshold
◦ Safe tagging to images from iPhoto
◦ Fast and stable comparison algorithm
◦ Mode for comparing meta data of the files
◦ Search, sort, select and remove images in result
◦ Options for excluding images with low contrast from result
◦ Options for comparing images even flipped, rotated and gray-scaled.

[Info] Comparing images over network or on USB medias needs much time. It is strongly recommended to use images on local hard drive.

What's New

Version 3.1

◦ Bug fixes
◦ Result sorting
◦ Options for auto reset
◦ Search and select in result

Ratings and Reviews

4.1 out of 5

22 Ratings

22 Ratings

takes a bit to understand but I LOVE IT!


THANK YOU, UNIK! you just saved me HOURS of sitting in front of the computer comparing images. For some reason (!) my pictures were duplicated, all in the same (sometimes different) folders but with different names. Grab the folder(s), drop them and it compares them, press a button and it gets rid of all the duplicates, selecting the best one (based on resolution, file size or oldest before modifying). If you want to keep more than it suggests, you can, although normally you dont need to. Sometimes it’s confusing because if you have two very similar images they might appear in many “groups”, so basically the one at the left is the “main photo”, and if theres something alike it might show at the right, but if you have the “sensitivity” very high, that one might become a “main photo” below as well and also be kept. So basically, put your sensitivity at 99% and trust it.

Poor interface


The app does an amazing job of identifying duplicates. Just throw a folder (or set of folders, including nested folders) with thousands of images in it and in less than a minute it will have identified duplicates. BUT the interface to then choose which ones to keep is very poor. The ones the app recommends keeping are marked with a yellow star, but there is no way to move that star to another image. You can click on the blank star under other images, but it then turns green. You can also shift-click on them and a box appears around them. These two actions may or may not have the same effect (the instructions are minimal and very unclear) and in any case seem to mark the image for deletion, not retention. The app could easily win a 5-star rating if it had a consistent, easily-understood way of showing exactly which images would be retained. Also, the app needs to show the folder path to each image, as that can be a criterion for selection of which image to keep, particularly in the case of exact duplicates.



I don't know the universe of duplicate-identifiers out there but this does a fine job on an absolute basis. You have to play a little bit to really get it primed to erase only those selected, but once you play with the include/exclude star options, you can get there. I like that you can specify percentage similarity because relevance and accuracy will depend on image content to some extent; you can search iteratively. Very useful for me!! I really appreciate this app; thank you. Best two bucks I've spent.


Meanterm Inc.
1.6 MB
Age Rating
Rated 4+
© 2013 Meanterm Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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