Great resource for being free.

Works really well and is pretty easy to use, especially for being free. Some small tweaks to the filters would be huge though. Frequently it auto-marks exactly the wrong photos, and instead of a quick “toggle selection” or something, I have to check the ones I want checked manually. I’m also not convinced it does a great job with the same image in different sizes. Overall though, great for being free.

aaadams about Photos Duplicate Cleaner, v1.7