Phone Sensor Test

How to check your phone sensors

1. Open this page on your phone and tap Check all sensors. On iPhone, tap Allow for motion and orientation access.
2. Move the phone a little. Within a few seconds each motion row turns green with a live value, or red if the sensor is missing.
3. Tap Check location and allow location to see whether the phone gets a satellite or a Wi-Fi fix.
4. Tap any sensor name for its full test: calibration checks, graphs and fixes.

What the results mean

Each row has one of three results:

• Green (Yes, Supported): the phone has the sensor and the browser can read it. The live value under it should change as you move the phone.
• Red (Not found, No): no data arrived. For the accelerometer, gyroscope and compass on a phone, that usually means the sensor is missing (many budget phones have no gyroscope or compass) or motion access is blocked.
• Amber (Not exposed): the browser hides this sensor from websites. The light sensor, proximity sensor and raw magnetometer are hidden in almost every browser, so amber is normal there; their full tests use other ways to check them.

The score at the top counts the green rows. Two phones that work perfectly can score differently because browsers expose different sensors: Chrome on Android usually shows the most, Safari on iPhone shows motion and compass but no battery or vibration.

Which sensors does a phone have?

Almost every smartphone has an accelerometer, a proximity sensor, a light sensor and GPS. Most mid-range and flagship phones add a gyroscope and a magnetometer (compass); some budget phones leave them out to save cost, which is why some games, AR apps and Google Maps live view do not work on them. Flagships also add a barometer for altitude, a fingerprint sensor and sometimes a colour temperature sensor. Browsers cannot read the barometer or fingerprint sensor, so this page does not list them.

Gyroscope vs accelerometer

The two are easy to mix up. The accelerometer feels gravity and pushes, so it knows which way is down and when you shake the phone; the gyroscope measures how fast the phone turns. Together they give smooth, fast motion tracking. The full explanation is in gyroscope vs accelerometer.

Common problems and fixes

Every motion row says Not found

On iPhone, close Safari fully and reopen the page, then tap Allow. On Android, tap the lock icon by the address, open Permissions and allow Motion sensors. Battery saver can also pause sensors.

Only the gyroscope is missing

The phone probably has no gyroscope. Check the specification of your model; the what phone do I have page helps find the exact model.

Compass says Not found

Some phones have no magnetometer, and some browsers only give relative orientation. Try Chrome on Android or Safari on iPhone, then the compass test.

Location is approximate only

Turn on Location and precise location for the browser, then test outdoors. The GPS test tracks the accuracy over time.