Hi I have and iPhone and an iPad. I have tried lot's of apps related to coins, must of them are terrible. You mentioned Photograde, so I will skip that one. I use the Ampex (free) app from time to time. I use Bento ($$$) to keep track of my coin collection and Dropbox (free) to view my checklists on the go. I would also get a decent photo editor if you are going to use your iPhone to take pictures, I like PhotoForge ($$$).