I have been using Cisdem Duplicate Finder for 3 months. It is quite effective, often, three steps to delete duplicate files: "Scan → Rule 'Delete the oldest' → 1 click to delete → 1 GB of space cleared". Whether on my Mac, my iPhone, my external drives, or even my old iPhoto libraries, it easily detects similar photos, videos, documents. If you are tired of messy folders and wasted storage, this simple and fast software will help. Review collected by and hosted on G2.com.

There is a free trial, but it is not completely free.

Moreover, among its 8 selection rules, there are repeated options. For example, there are selections "high resolution" and "high quality", I don't see the difference. Review collected by and hosted on G2.com.