Some people (myself included) have too many duplicate images!
Even worse — some are just barely different from each other. One pixel different. This makes it difficult for some duplicate file finders to get these images.
VisiPics can find these pictures — it goes past the checksums and looks at the actual image. You can decide how strict or loose you want it. Or which folders to do. (If you have 10000’s of pictures, it can be faster to do each folder seperate — unless, of course, the photos are in different folders!)
It is also very fast and the best part is that it’s free.