It doesn’t give any progress information or let you control how or when it searches though, and Photos’ duplicate detection only operates on a single library at a time. Photos system works automatically in the background, and will display a “Duplicates” album containing what it has found when it’s finished searching. The two function pretty similarly overall, but Photos’ system works differently from PowerPhotos in a number of ways, both with their advantages. Starting in iOS 16 and macOS Ventura, Apple added a feature to their Photos app that can detect and eliminate duplicate photos.
