Best tool for the purpose

I had been using Graphic Converter’s “Find Duplicates” feature to find duplicates (or similar) in my photo collection but I noticed many cases where it failed to find photos that visually were very similar.
PhotoSweeper is far more effective at finding similar photos. (At least after I changed the preference setting to All Photos instead of just photos with the same aspect ratio.)
And PhotoSweeper is amazingly fast and does’t use much memory while doing the comparison.
I highly recommend it.

random7689 about PhotoSweeper, v1.9.7