[shotta]

I use the App Flic to sift through my photos. It lets you pick a month (or I think day) and then you go through your photos right swiping (keep) and left (trash bin to review once again before emptying.)

Another app, Gemini, can help you find photos of nothing (floor shots, sky shots, pocket shots) and blurry shots and duplicates.

[gadders]

I used to like the android app Slidebox that walked you through your gallery and swipe left or right to keep photos. Unfortunately it seems like abandonware since 2016 and doesn't support SD storage.