At WWDC 2018, Apple kicked off celebrations with Augmented Reality and discussed the all-new ARKit 2.0 and an iOS 12 app called Measure, which lets you measure real 3D objects. While similar apps have been around for some time, Apple's solution may be the best way to avoid your pocket tape.
If you want to use Measure, you'll need to be on the beta version of iOS 12, but you can use any iPhone you have – not just the iPhone X. This new stock app uses your rear camera to get things done in real life measure, and it's pretty easy to use. It takes some work in the accuracy department, especially as AR points are still drifting in space, but it's a great first step for Apple's first major AR-specific app.
How to measure real objects
First open up Measure either on the home screen, with Siri or in the search window. Your iPhone may ask you to move your iPhone for more accurate measurements. A white circular cursor appears in the center of the screen. Point to the object you want to measure. If it is a rectangle, a yellow box should appear over it that you can tap to spit out rough dimensions.
You can also manually point the cursor to something, tap the plus sign (+ ) below to create a point, then tap again when you've drawn the line you want Your iPhone tells you how long it is. You can also record as many lines as you like. If you want to save your measurements, tap the white circle on the right to take a screenshot.
You can also tap on the recorded measurement to bring up a new screen that you not only in feet and inches, but also in centimeters. From here you can easily copy the digits so you can paste them into a note or wherever you like.
If you use the "Layers" tool In the Compass app you will probably find that it has now disappeared. That's because it's moved to the Measure app, which makes sense because it's more about measurements than directions.
Inside Trade Fairs, tap on "Layer" in the lower right corner to use the tool. Your iPhone will be able to tell if your phone is horizontal or vertical, flat on a table, or upright. When it's at zero degrees, your iPhone turns green, indicating it's straight.