what app do you use to cleanup your iphone

See this page in the user guide how to merge duplicate photos and videos: Merge duplicate photos and videos on iPhone - Apple Support

And how to check the storage and manage it: How to check the storage on your iPhone and iPad - Apple Support

TeeandCP wrote:

Want to cleanup duplicate pictures and storage

You don't need an app. Your phones tells you if you have duplicate pictures and you can merge them.

Clean up storage by deleting data off your phone, offload or delete unused apps.