Controller Test

Web browsers only recognize controllers after you press any physical button (such as A, X, or the D-pad) to trigger the Gamepad API. If your controller still does not connect, close Steam or background remapping software (like DS4Windows or JoyToKey) which often claim exclusive access to controllers, and ensure you are using a Chromium browser like Chrome or Edge.

Stick drift happens when internal potentiometer sensors wear down, oxidize, or collect dust, causing the stick to report movement even when untouched. A resting drift under 5% is normal factory tolerance. Values between 5% and 10% represent normal wear covered by standard in-game deadzones. Any drift exceeding 10% causes noticeable camera or character drifting in games.

Circularity error measures how closely your thumbstick's outer travel matches an ideal circle in a 360-degree rotation. Standard official controllers score between 5% and 10% error, while magnetic Hall Effect sticks typically score under 5%. Error above 15% indicates square clamping that creates uneven diagonal sensitivity.

Gamepad rumble requires a Chromium browser (Chrome, Edge, Brave, Opera) as Firefox and Safari do not support the Gamepad Haptics API. Additionally, Windows Bluetooth drivers often disable force feedback endpoints on wireless Xbox and DualSense controllers; connecting with a USB-C cable restores full dual-motor rumble.

Traditional potentiometers rely on physical wipers rubbing against carbon resistive tracks, which inevitably wear out and cause stick drift. Hall Effect thumbsticks use permanent magnets and contactless sensors to measure position without friction, virtually eliminating stick drift and maintaining sub-5% circularity error over years of use.