Every now and then, you may need a level—perhaps you want to hang a picture—but you may not want to dig through the garage to find one. No problem: You’re iPhone has you covered.
Navigate to your Compass app and open it. Calibrate the compass as usual, and when the compass itself appears, swipe from right to left to get to the level feature. It’ll show you how many degrees from level your phone is, and give you some indication of which side is higher than the other. When it’s level, the screen will turn green.
The level works regardless of which way you use your iPhone—flat on its back, on its side, whatever—so it lends itself well to most household tasks. Play around with it and see how it works for you.