I’ve been using an app called Light & Ruler as my portable level for awhile, and absolutely love it. But with iOS 7, you don’t actually need it anymore because it has a level built right in.
To access it, open the Compass app, and swipe to the left…and tada…welcome to the Apple’s Level.
Let your iPhone stand in portrait or landscape mode to test the place. If it’s leveled, it will show green with 0ºc on the screen.
And if you place it on a surface flat, you will see if it’s leveled or not as well. If it is, it will shows in green.
That’s it. It’s a simple feature that’s going to be very useful to any of us. Enjoy and happy leveling.