गेमपैड टेस्टर (कंट्रोलर टेस्ट).

Uses the browser’s Gamepad API; vibration depends on the browser and controller. Everything is calculated in your browser; nothing you type is uploaded.

The page reads navigator.getGamepads() on every frame; analog values are shown from −1 to 1, and a stick that reports between 0.08 and 0.5 at rest is reported as drift.

An Xbox controller shows 17 buttons and 4 axes; a left stick resting at 0.12 is flagged as possible drift.