Let's say you want to mount your iPad on the wall when you use it as a photo frame. Or maybe you're hanging the brand new HDTV you just bought on sale. You will want to make sure it hangs centered on the wall.
Now you can use your smartphone to help you out. iPhones come equipped with a built-in level you can use. All you need to do is open the built-in compass app and swipe over to the left. There, you can see how straight your phone sits. If its level, you'll see a 0. If it's not level, you'll either see a + or - with a number.
But that can be boring. If you want the look and feel of a real, honest-to-goodness level with the liquid and the bubble, that's where the iHandy Level for iOS and Android app comes in. This app works as a level by using your phone's sensors.
Use it for hanging picture frames, TV mounts, light fixtures, anything you want to straighten out.