iOS: Apple's default camera app is a multifaceted photo capture tool, and simple enough to use. From panoramas to videos to HDR pictures, you can capture a variety of images, but can't reach that granularity you might want if you're trying to frame that perfect shot. Photographers looking for more control should check out Halide ($7.99), a great app for dedicated photographers who want controls at their fingertips, or amateurs who want to play with the principles of the medium.