fastbackward shows you all photos you took on this day throughout the past years. For more than one year of memories you'll need the pro version of fastbackward.
Works fine with photos stored inside Apple iCloud.
Open fastbackward only when you need to. With the built-in notification feature you can get notified on each day you have memories.
View extended metadata for each photo like location, camera model/make and much more.
None of your photos or even it's metadata will ever leave your iPhone.
Found a screenshot you took accidental five years ago? Those things you can delete with one tap.