A level feature is built right into the iOS Compass app through which you can gauge the angle of a surface. If you want your phone to do more, you can grab any number of apps from the App Store, like ...

Need to check for a level surface when hanging a painting, putting in a shelf, or doing construction around the house? A regular level tool would certainly come in handy, but maybe you don’t have one.

WHAT YOU NEED: a ruler, a compass and a pencil. STEP 2: Put the pin of a compass at the end of the line you want to bisect. Set the compass to more than half the length of the line, and draw an arc ...