iPhoneography Apps! Snapseed
One of my favorite iPhoneography apps that I use for basic image corrections is Snapseed! It doesn't have any filters but it's usually the first app that I used to make corrections to the photo, like brightening and sharpening. i took a photo of Cliff and Gizmo on a lunch date and the photo was really dark. I knew I could save this photo in Snapseed.
There is a little bit of a leaning curve with this app but you will love the results!