Is it possible to search for duplicate images (not in Photos) based not on file name but on the image itself?

Give You want an app that will identify the potential duplicates, put them in an album or mark them with a keyword for easy retrieval and deletion by you. You don't want one that does the deletion itself for obvious reasons. 

I've run tests on the these this app with the following results and found it to be safe to use:

PhotoSweeper - $9.99 - Demo version available.

PhotoSweeper compares bitmaps and/or histograms so it can detect duplicate images even if they have different file sizes, file names, image sizes and capture dates.

I ran it on about 80 folders containing about 50K photos and it took around 1 hr. You can try the demo version so see if it will pickup your duplicates.

Sure, there are more than a few apps that do that: Duplicate Annihilator, Gemini 2 - I'm sure there are others. They usually have a setting for finding duplicates by file hash, or some heuristic method that isn't just a name match.

No idea which ones are considered to be good these days, however.

dialabrain wrote:

FWIW, it appears to be $14.99 now.

Dang. I thought only bread and eggs were going up exponentially. At the developer's site it's a penny more. For once the App Store has a bargain.

FWIW, it appears to be $14.99 now.

Old Toad wrote:

Dang. I thought only bread and eggs were going up exponentially.

🤣 I wish.