I really appreciated that you wrote this, and more specifically that you tested the apps as you did. If you are one of them, the steps above are still useful. Find look-alike and duplicate images in a folder, computer, network, or find duplicates in Adobe Lightroom. Tested with 1 million images - this is the only tool that can promptly find duplicates in large photo collections. The developer will be required to provide privacy details when they submit their next app update.
nest...