Ok so I have regular readers who are not professional photographers who want to take better photos with their smartphones. Smugmug is an app that actually give you some options that a professional photographer consider, necessary for making great photos. On my SLR I have an exposure lock button. This button lets my camera meter for one area of a photo while letting me focus on another area. Until now your iPhone metered where you were focused allowing for little control of severe lighting etc. Smugmug offers a lot of neat features, but as a pro this is my favorite.