Czkawka is more than just a dupe finder
It has a comprehensive tool set with a wide range of applications

Czkawka's main purpose is to find duplicate files, but it offers a variety of methods for doing so. The Duplicate File Finder feature allows you to check files not only by hash, but also by size, name, or both. And if you search by hash, you can choose between Blake3, CRC32, and XXH3. When I put the app to the test, it turned up a slew of duplicates in my downloads folder (of course) and quite a few in my documents.

But that's not all it can do. I can search specifically for big files, empty folders (which I found a surprising number of), similar images and videos, and even duplicates of music. Each search is customizable, too, allowing more granular control over the results.