Apps similar to Unik include Easy Duplicate Finder. It's paid, but Pixiple and Image Comparator are free. Other options are Tidy Up and Duplicate Office File Remover. In total there are five Duplicate File Finders like Unik for Windows and Mac.
This powerful tool identifies and removes duplicate files on your PC or Mac using flexible algorithms. It compares files by content, e-mails, and music tags. Enjoy Live Preview, file recovery through an undo function, and integration with iTunes, iPhoto, and Windows Media.
United States
Pixiple searches your files for images that are similar in pixel and/or metadata content and presents you with a sorted list of similar image pairs to compare and manipulate. Pixiple is open source, no-nonsense, unrestricted and completely free.
Tidy Up is the duplicate finder and disk tidiness utility for expert users. It's the only fully-featured duplicate remover available on the market, and allows you to efficiently clean your computer from the junk it built-up.
Italy
EU
Image Comparator is an easy tool that finds duplicate image files in your system. In order to do that it scans your images pixel by pixel; therefore even if two images have different formats and file sizes (MB/KB) Image Comparator finds them.
Duplicate Office File Remover Free - a program that will help you remove duplicate files created in MS Office. If you often work with Office applications on your computer, with time on his hard drive accumulates a large number of files Word, Excel and so on.
Russia