The test uses the browser Gamepad API (navigator.getGamepads()) which is supported in all modern browsers including Chrome, Edge, Firefox, and Safari. The API polls connected gamepads via requestAnimationFrame to detect button presses, axis values, and trigger states in real time. You need to press a button first to "activate" the controller — the browser requires user interaction before exposing gamepad data for privacy reasons.

The browser Gamepad API supports multiple simultaneous controllers. However, this tester is designed specifically for Xbox button labeling and layout. For PS5 DualSense testing, use our dedicated PS5 Controller Test. Both use the same underlying Gamepad API — the difference is purely in button labeling (A/B/X/Y vs Cross/Circle/Square/Triangle) and visual layout.

Stick drift appears as non-zero axis values when you release the stick to its center position. In this tester, the stick visualization shows a drift warning when the stick magnitude exceeds the deadzone threshold. Increase the deadzone slider to see if drift persists beyond it — if it does, the drift is significant. Typical signs: your character moves without input, or the crosshair drifts in one direction consistently.

First, ensure you connect via USB or a supported Bluetooth adapter, then press any button on the controller — the browser requires an initial button press to activate the gamepad. Use Chrome or Edge for best compatibility. Check that no other application (like the Xbox App or Steam) is exclusively claiming the controller. On Firefox, gamepad support may require enabling gamepad.enabled in about:config. Wireless Xbox controllers need either the official Xbox Wireless Adapter or Bluetooth.

LT (Left Trigger) and RT (Right Trigger) on Xbox controllers are fully analog. They report values from 0.0 (fully released) to 1.0 (fully pressed), allowing for precise analog input in games such as racing games where trigger depth controls acceleration. In the tester, you will see the progress bar fill as you press the trigger. This is different from the bumpers (LB/RB) which are purely digital (pressed or not pressed).

Wired USB connections typically have lower input latency (1–2 ms) compared to Bluetooth (10–15 ms) or the Xbox Wireless protocol (~8 ms). For competitive gaming, wired is preferred. However, the browser Gamepad API polls input at your monitor's refresh rate via requestAnimationFrame, so polling is the same regardless of connection type. The physical wireless latency is fixed — the browser cannot reduce it. Most players cannot perceive the difference in casual gaming.