Ducl Duplicate Photos Cleaner 4+

I love this app I’ve tried a couple of different ones they all wanted to charge a crazy expensive price to use it this one so far is been free and works amazing

On first scan of all images, it missed a lot of known duplicates - less that half, maybe 1/3. I then duplicated 2 photos 3x. In each of these groups of duplicates, I slightly cropped 1 of the photos. I scanned all photos again and none of these photos showed up in the results whether I moved the similarity slider to 60%, 70%, 80%, 90% or exact. What’s worse is that it has particular difficulty with any, mostly white, photos of documents even in “exact” mode. Some groups had dozens of very different documents. In checking other similar groups, I found some of the same documents as the first group i.e. the exact same documents were in several groups, but not in the same group. The app fails at it’s most basic functions.

Concept is good. I honestly I can’t believe that apple doesn’t have photo cleanup built into iOS, so this app provides a helpful service. However, a couple of problems need to be addressed to make it really useful.

Scanning your entire photo library (mine is around 20,000 photos) takes a VERY long time, and it doesn’t seem to run in the background. Therefore, you have to stay in the app and make sure the device doesn’t sleep. I spent about 20 minutes scanning and then switched apps, and when I came back I had to start the scan again.

Currently there are only 4 scan options: scan selfies, scan screenshots, scan all photos for all duplicates, scan all photos for specific image. Need way more options to make the app truly useful. See suggestions below>

Suggestions for developers - (definitely would improve my rating if any were implemented)

1)”Scan by album” - it would be great to be able to scan specific albums. For example, I have a separate album for each year. This would speed up the scanning process

2)”Scan by date range” - filter to set start and end dates to scan. Also would speed scanning process

3)”Refresh scan” - save results of scan, and add refresh button so that you don’t have to rescan every single time

Basically, use available metadata to allow user more options to limit the range of photos to be scanned, and the run the photo comparison algorithm only for that subset.