simple cleaner-space cleaner application

Because of the way the operating system is designed, such an app is not possible for an iPhone or iPad.

There are things you can do:

Manage your photo and video storage - Apple Support

How to check the storage on your iPhone and iPad - Apple Support

If the problem is that you are showing an excessive amount of "Other" when you check the storage on your phone, the easiest way to fix that is to make sure your phone is backed up then restore it to the backup.

There are people in the community who decry this type of app.

Apple does not endorse them.