Similar Pic Finder -Dupe clean

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Downloaded and ran it (after guessing the operation - no help file.) App requires a reference photo to be identified and it searches for dupes. I haven’t seen a way for it to identify all dupes of all photos. When I ran it against 257+GB/26000+ files but the system showed the ‘beachball’ and all apps slowed to a crawl - apparently it uses a ton of system resources. Too much money for something that I couldn’t get to work reliably.

This is the kind of photographic tool that I don’t need now, but probably will need in the future, so $2 is cheap to add it to my toolbox. I ran a couple of test searches and the ‘Dupe Search’ went as expected, hunting through a nested set of folders looking for duplicates and finding them, regardless of the file name. The ‘Similar Search’ just crashed the app as soon as I ran it, so I don’t know how well that’s supposed to work. In all, it looks beta quality, with no help files, and a progress status that makes no sense— what does 7905/4900 actually mean? I’m looking forward to what this application will become, once the bugs are worked out. I figure the price is a good investment for the tool it should become. I’ve made worse choices on kickstarter. I’m giving it a four-star, but it could quickly get that fifth star after some improvements.