What are some alternatives?
When comparing Duplicate File Finder Plus and VisiPics, you can also consider the following products
AntiDupl - AntiDupl.NET can find and display duplicate images in the main graphic formats: JPEG, GIF, TIFF...
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Duplicate Cleaner - Duplicate Cleaner: the fastest and most popular tool for finding duplicate files. Over 1 million downloads: Get your copy now! Free and Pro versions available.
Easy Duplicate Finder - Free download! Find and delete duplicate files with Easy Duplicate Finder™. Get rid of annoying duplicates on your Windows and Mac.
FSlint - FSlint is a utility to find and clean various forms of lint on a filesystem. I.E.
Pixiple - Find images similar in pixel and/or metadata content