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Apple introduced a new, useful measurement app back when it released iOS 12 that also includes a level (the Compass app no longer has a level feature). Third-party developers have long offered a level app, a tape measure app, or both, so it's great that owners of the iPhone 8 and later can now enjoy this feature for free. I've written about how to use the augmented reality (AR) tape measure portion of the Measure app in a previous tip, so now it's time to go over how to use the level feature; let's get started!
Related: How to Use Your iPhone's Scientific Calculator

- Open the Measure app, (mine is in my Utilities folder).
- Tap on Level at the bottom of your display.
- Now find the surface you'd like to check for level and place your iPhone on it; you can hold your phone in portrait or landscape mode. When the surface you're testing is level, you'll see 0° and a green screen.
- If the surface you're checking isn't level, the screen will be black, and you'll see how many degrees plus or minus it's off from level.
That's it! Enjoy your free level, courtesy of Apple.