Duplicate Wizard's answer
Duplicate Wizard started as a personal need: finding duplicate files across a few hard drives. Finder offered no intuitive visual way to track them across folders and backups, and the dedicated duplicate finders on the market all had the same problem: a flat list of filenames. When duplicates are scattered across nested folders and old backups, it is hard to understand where files actually live, and deleting anything starts to feel like guessing.
Pricing was another frustration. Most of those apps were sold as subscriptions, even though duplicate cleanup is rarely a regular activity. For most people it happens once or twice a year, when they reorganize a hard drive, free up space, or migrate to a new Mac. A monthly subscription felt wrong for a tool used that rarely.
That frustration led to building a native macOS app where the folder structure stays visible while reviewing duplicates, not just as a path label next to each file, but as an interactive folder tree you can browse and expand. Every copy is shown in its real location before any decision is made. The pricing model followed the same principle: a one-time purchase, since that matches how the app is actually used.
A configurable scoring engine was added later, suggesting which copy to keep based on name quality, modification date, and path depth, so groups can be resolved quickly without giving up control.
Duplicate File Finder by Nektony
DaisyDisk
MacUncle EML Duplicate Remover
FreeFileSync
Dropover
GoodSync
Econ ChronoSync
