Prevention is better than cure.:
Umbrella reports the duplicates the moment they are created. Forget the boring job of dealing with huge results when using a standard duplicate tool. Umbrella is the only duplicate-prevention tool available on the market. It is unobtrusive, easy to use, and powerful. Umbrella is a perfect Tidy Up 5 complement, and used together they will keep your Mac clean and efficient.

Features:
* Search in iTunes database.
* Search Photos image files.
* Search by files.
* Customize criteria to determine the duplicates.
* Automatic mark for a fast removal.
* Multiple files preview.
* Full integration with Tidy Up 5
* And many more.

Compatibility: macOS 10.14 or later 64-bit
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