Accelerometer test
Tap Start, then tilt, move, or shake your phone. The X, Y, and Z numbers and the peak reading show the sensor responding.
Accelerometer test workspace
Privacy: Acceleration values are shown on this page only. No motion data, sensor stream, or device identifier is sent anywhere.
How to use
4 short steps.
Tap Start accelerometer
On iPhone, allow motion access when Safari asks.
Tilt the phone
The marker slides toward the low edge like a ball on a tray. Including gravity reads about 9.8 when the phone is flat.
Shake it
The peak reading jumps well above 9.8. That is the quickest sign the sensor responds.
Stop or reset
Stop keeps the last values. Reset clears them and the peak.
What the result means
Match what you see to one of these.
If the values change and the peak rises when you shake, the accelerometer works
Auto-rotate, step counting, and shake gestures all depend on this sensor.
If a flat, still phone reads about 9.8 m/s² including gravity, the sensor is scaled correctly
That reading is Earth's gravity. Acceleration without gravity should sit near zero at rest.
If nothing changes, the browser is not getting motion data
Computers and some private browsing modes have no accelerometer access. Open the page on the phone.
Troubleshooting
If the test fails, try these in order.
Allow motion access
On iPhone, reload and tap Start to get the prompt again. On Android, check the site's Motion sensors permission, then retest.
Check auto-rotate
If the screen still rotates when you turn the phone, the sensor works and the browser is the issue. Try Chrome or Safari and retest.
Leave battery saver and restart
Power saving can pause sensors. Turn it off, restart the phone, and tap Start again.
Run the maker's sensor test
Samsung's *#0*# menu has a Sensor screen with live accelerometer values. If it fails there too, the phone needs service. Retest here afterwards.
What this test can't tell you
Where a browser check stops.
- The page shows that the browser received acceleration data. It cannot judge calibration, noise, or accuracy.
- Values arrive through DeviceMotionEvent and may be rounded, throttled, or fused with other sensors depending on the browser.
FAQ
Common questions about this test.
Does my phone have an accelerometer?
Almost certainly. Every smartphone has one, and if auto-rotate works, it is working. This page shows the numbers behind it.
What does an accelerometer detect?
Movement and gravity along three axes, in metres per second squared. Tilt, shake, and step detection all come from it.
How do I test the accelerometer on Android?
Open this page in Chrome, tap Start, and shake the phone. Samsung phones also have a Sensor test in the *#0*# menu.
What is the difference between an accelerometer and a gyroscope?
The accelerometer senses movement and tilt. The gyroscope senses rotation speed. Try the gyroscope test to compare.
How accurate is a phone accelerometer?
Good enough for games, step counting, and screen rotation, typically within a few percent. A browser cannot measure that accuracy, only the response.