What are some alternatives?
When comparing Duplicate File Finder Plus and AntiDupl, you can also consider the following products
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
VisiPics - VisiPics does more than just look for identical files, it goes beyond checksums to look for similar...
Easy Duplicate Finder - Free download! Find and delete duplicate files with Easy Duplicate Finder™. Get rid of annoying duplicates on your Windows and Mac.
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.
Anti-Twin - Anti-Twin is a small software application which compares files, i.e.
Pixiple - Find images similar in pixel and/or metadata content