Here's a fun addition to your iPhone camera app arsenal: QuadCamera ($1.99, available here) which takes four shots in quick succession. If you like to photograph action sequences, such as a sports competition, you'll enjoy seeing how the scene changes from one shot to the next. We tested it with our pets and with people on the street, and the results were just as fun.

One of the best things about the app is the range of settings. You can set the interval between shots, so that all four shots are taken in rapid succession or with as much as three seconds between them. You can also choose to view the results in a horizontal two on two configuration, or vertically with all four in a row. Shoot in color or black and white, if you prefer.

We found taking pictures with QuadCamera to be just as simple as using the iPhone's built-in camera app, and the results were oddly fascinating. If you're looking to do more with your phone's camera, give this inexpensive app a try.