How to compare motion response in portrait and landscape

Your phone responds to a tilt in portrait mode, but seems different when you turn it sideways. Or you are checking a tablet before using an app that follows movement. A quick comparison can show whether the sensor is responding, and whether the difference is just how the browser reports the device’s orientation.

Use the Sensors Test on the device you want to check. Repeat the same small movement in both orientations and compare the response, rather than expecting the same numbers on screen.

Compare motion in both orientations

1. Open the Sensors Test on your phone or tablet. If the browser asks for motion or sensor access, allow it for the test.
2. Hold the device still in portrait orientation for a few seconds. Notice whether the motion readings settle, then make a small, slow tilt and watch how the readings change.
3. Return the device to stillness, rotate it to landscape, and hold it still again. Repeat the same tilt relative to the screen edges, at about the same speed and angle.
4. Repeat the comparison two or three times. Keep your grip steady and avoid tapping or twisting the device while you read the results.

For a fair comparison, use the same starting position and movement each time. A tilt of roughly 10 to 20 degrees is enough. You do not need to move the device quickly or shake it.

What the result means

The readings change smoothly in both orientations

The motion sensor is responding. The numbers or directions may differ after rotation because the device and browser can describe movement relative to different axes. An axis is one direction of measurement, such as side to side or top to bottom. A response that changes smoothly and predictably is more useful than matching numbers between portrait and landscape.

The readings respond, but a different value changes

This can be normal. When you turn the device, its sides move relative to the sensor’s axes. A motion that affected one displayed value in portrait may affect another value in landscape. Compare the pattern of change and whether it follows your hand movement, not just the name or size of one number.

There is no response in either orientation

The browser may not have access to motion data, the device may not expose the needed sensor to the browser, or the test may not be supported in that browser. Check permission and try a current browser on the device. A desktop computer without motion sensors will not provide phone-like movement readings.

The readings jump or stop intermittently

First repeat the test with the device held still and then moved slowly. Hand tremor, a loose grip, or a browser tab that has been in the background can make the result look uneven. If the same sudden gaps happen repeatedly while the device is still, check permissions and compare in another browser.

How to fix missing or confusing readings

1. Allow sensor access. If the browser showed a permission prompt, choose its allow option. If you dismissed it, open the site’s permissions from the icon beside the address bar, allow motion or sensor access if listed, and reload the page. Browser controls vary, and some browsers do not offer a separate motion permission.
2. Keep the test in the foreground. Leave the Sensors Test visible while you move the device. Phones may limit sensor updates when a tab is in the background or the screen is locked.
3. Check orientation lock separately. On an iPhone, open Control Center and check that Portrait Orientation Lock is off if you expect the screen to rotate. On Android, check Settings › Display › Auto-rotate screen, or the similarly named quick setting. These controls affect screen rotation, not necessarily whether the motion sensor itself can report data.
4. Check the display orientation on a computer or tablet. In Windows 11, open Settings › System › Display and check Display orientation. On macOS, open System Settings › Displays and use a rotation option only if one is available. Changing the display orientation can change what you see, but it does not prove that a motion sensor is working.
5. Reload and try another browser. Close other tabs using sensor features, reload the test, and repeat the comparison. If readings work in one browser but not another, the difference is likely browser support or permission rather than a damaged sensor.

Why portrait and landscape can look different

A sensor measures movement along physical directions inside the device. Turning the phone changes how those directions line up with its screen edges. Software may rotate or reinterpret the data so an app can respond consistently, but browser support and reporting can vary. For that reason, this test is useful for checking whether motion is detected and changes consistently, not for requiring identical values in each orientation.

Also separate screen rotation from sensor response. A screen that stays upright may simply have rotation lock enabled. Conversely, a screen that rotates does not confirm that every motion sensor or every app is receiving the data it needs.

The Sensors Test runs in your browser on the device being checked. For a reliable comparison, keep the test open and repeat the same gentle movement in both orientations.