How Do You Use iPhone LiDAR? Measuring, Depth Maps and Point Clouds Explained

To measure a distance with the iPhone’s laser scanner, start with the system Measure app; to look directly at LiDAR depth maps, point clouds and scene meshes, open Hardware → LiDAR in Device Status⁺. Before you start, confirm that your device has a LiDAR scanner and allow the app to use the camera.

The LiDAR tools added to Device Status⁺ put this layer of information on screen. Open Hardware → LiDAR to switch between four modes — depth map, point cloud, scene mesh and measuring — see how tables and chairs relate in space, trace the surfaces of a room, or place a few points and estimate the distances between them.

Where do you turn on iPhone LiDAR?

Experiencing LiDAR does not mean hunting for a standalone “LiDAR switch”: you open an app that uses the capability. In Device Status⁺:

1. Open the Hardware page.
2. Find LiDAR, tap it and allow camera access.
3. Choose Depth, Point Cloud, Mesh or Measure at the top.

If you only want a quick size estimate of an object, Apple’s own Measure app works too. Apple publishes instructions for the built-in Measure app; the point-picking steps later in this article refer to Device Status⁺.

Which iPhone and iPad models support LiDAR?

You need an iPhone or iPad with a LiDAR scanner and support for the matching AR features, and you must allow Device Status⁺ to use the camera. The app checks the device’s capabilities; unsupported devices show a notice, and installing an app cannot add hardware that is not there.

For example, Apple introduced the LiDAR scanner on the iPhone 12 Pro and iPhone 12 Pro Max and the 2020 iPad Pro. That is not a complete list of supported models; to confirm your own device, check whether “LiDAR Scanner” appears in its tech specs rather than relying on the “Pro” name.

For a first look, point the camera at a desk so the frame includes the desktop, a few objects on it and the wall behind. Switching modes then makes it easier to see how the same scene changes.

Depth map: see distance as color

In Depth mode the picture is colored by distance: near surfaces lean red, farther ones shift through yellow, green, cyan and blue. Hold a hand in front of the lens and slowly move it away to watch the color and readings change.

Five metrics sit at the bottom of the page:

Metric	How to read it
Center	Depth at the center of the depth map, in meters
Nearest	Smallest valid reading in the current depth map
Farthest	Largest valid reading in the current depth map
Valid	Share of pixels with a valid reading
High Confidence	Share of readings that are both valid and marked high-confidence

The 0.2–5 m marked on the color scale is the range mapped to this colormap. Valid readings outside it keep the end colors, so color alone cannot tell you an exact distance, and the range is not a promise of uniform accuracy.

Low-confidence areas render darker, and areas without valid depth are black. Black in the depth map does not mean the object is black; it means no usable reading exists there. High Confidence is not a hardware health score and is not meant for ranking phones.

Point cloud: see the desk from another angle

Switch to Point Cloud and depth becomes colored points in 3D space. Drag with a finger to orbit the view and study how the desk, objects and background relate spatially.

This mode samples the current depth data and draws only valid, high-confidence points; Points at the bottom shows how many are drawn. The colors still encode distance, not the object’s real color.

A cup on the desk is a good scene to try: look at it from the front, then orbit the point cloud and the distance between the cup and the wall behind becomes easier to grasp. Orbiting does not conjure up the back of the cup, though. What you see is the depth point cloud of the current view, not a finished all-around scan of the object.

Scene mesh: watch a room get reconstructed

Switch to Mesh and a wireframe of the reconstructed scene overlays the camera image. Move the device slowly across the desk, floor and corners to watch recognized surfaces stitch together.

Two counts appear at the bottom:

• Mesh Anchors: number of mesh chunks in the current scene.
• Faces: total number of triangles in those meshes.

They describe the size of the current reconstruction; they cannot be converted into floor area and are not an accuracy score. Apple’s scene reconstruction documentation describes the process: ARKit uses depth to estimate the shape of real objects and produces meshes representing surfaces.

How do you measure with iPhone LiDAR?

To estimate the distance between two ends of a desk, open Measure:

1. Aim the crosshair at the center of the screen at the starting point on the desk and wait for a reading.
2. Tap Add Point to record the first position.
3. Move the device, aim at the end point, tap Add Point again.
4. Read Last Segment: the straight-line distance between the two most recent points.
5. As you add more points, Total Path accumulates segment distances between adjacent points. Tap Clear to start over.

Center in Measure mode is the estimated distance from the camera to wherever the crosshair hits — not the length between two measured points. Last Segment and Total Path show values only after at least two points exist.

Add points A, B and C in turn and Total Path computes AB + BC, not the straight line from A to C, and it does not close into a perimeter. Up to 20 points are kept; clear them when you hit the limit.

If the center reading shows —, no usable surface hit exists and the add-point button is temporarily disabled. Move the crosshair to a clear surface, adjust the device slowly and try again.

How accurate is iPhone LiDAR measuring?

LiDAR depth and AR surface estimation depend on scene conditions. Apple notes in Explore ARKit 4 that highly reflective or light-absorbing surfaces can reduce depth accuracy. So when you see dark regions, missing points or shifting readings, compare against another surface before deciding something is wrong.

A few habits help:

• Aim at an ordinary desk or wall first and move slowly so the device can observe the environment.
• Wait for readings to settle before measuring; pick the same spots repeatedly and compare how close the results are.
• If the camera preview never appears, check that Device Status⁺ is allowed to access the camera in system settings.

This tool is for understanding LiDAR, studying spatial structure and estimating everyday distances. Readings shown to two decimal places are not a guarantee of centimeter-level accuracy; for exact dimensions, double-check with a proper measuring tool.

How is this different from the built-in Measure app?

If the goal is a quick size estimate, the system Measure app already covers it. The LiDAR tools in Device Status⁺ suit people who want to look one layer deeper: the same scene can switch between depth map, point cloud and wireframe, show the share of valid readings, and use point-picking to reason about distance.

Choose by need: measuring sizes → Measure; observing spatial data → depth map and point cloud; understanding surface reconstruction → mesh. More points or wireframe on screen do not automatically make the measured size more precise.

Can it scan a room or export a 3D model?

The current tools provide live depth preview, point-cloud viewing, scene mesh and point-picking measurement; there is no 3D model export and no automatic floor-plan generation. If you simply want to know what your phone’s LiDAR can “see”, start with a desk and step through the four modes — the same scene appears in four different representations.