Why do I need WebHID for gyro?

The standard Gamepad API does not include motion sensors. WebHID lets the page read the raw reports the controller sends, after you grant permission.

Does it work over Bluetooth?

This tool decodes the USB report format. Over Bluetooth the controller uses a different format until a driver switches it, so use a cable for this test.

Can this fix gyro drift?

No. It only reads values. Gyro drift in games is usually solved by the game or Steam Input recalibrating while the controller lies still.

Controller gyro test

Connect a DualSense or DualShock 4 by USB, grant WebHID access, then tilt and turn it. All six motion axes update live.

Motion

Not connected

Sensors (raw counts)

Gyroscope

X—

Y—

Z—

Accelerometer

X—

Y—

Z—

Reports received: 0. Values are uncalibrated sensor counts. The tilt preview follows angular rate, not absolute orientation.

How to run this test

Use Chrome or Edge on a desktop computer.
Connect a DualSense or DualShock 4 with a USB data cable.
Press Connect and pick the controller in the browser prompt.
Lay the controller flat, then tilt and rotate it along each axis.

How to read the result

Gyroscope: Angular rate on three axes, in raw sensor counts. At rest the numbers should hover near a small constant. Large values while the controller is still point to a sensor that needs recalibration by the console or is failing.
Accelerometer: Acceleration on three axes, including gravity. Lying flat, one axis shows a large steady value and the other two stay near zero. Rotate the controller and gravity should move from axis to axis.

Questions about this test

Why do I need WebHID for gyro?: The standard Gamepad API does not include motion sensors. WebHID lets the page read the raw reports the controller sends, after you grant permission.
Does it work over Bluetooth?: This tool decodes the USB report format. Over Bluetooth the controller uses a different format until a driver switches it, so use a cable for this test.
Can this fix gyro drift?: No. It only reads values. Gyro drift in games is usually solved by the game or Steam Input recalibrating while the controller lies still.