Gamepad & controller tester

How to measure stick drift

1. Connect the controller and press a button so the browser lists it.
2. Take your hands off and press Measure drift. For 3 seconds the tester records where each stick rests; the result is the resting offset as a percentage of full deflection.
3. Under 5 % is normal and hidden by every game’s deadzone. 5–10 % needs a slightly larger in-game deadzone. Over 10–15 % means the stick is worn — see how to fix stick drift for cleaning, calibration and replacement options.

Circularity

Rotate a stick slowly around its full range: the trace should be close to a circle. A square or clipped trace is normal for some controllers (they reach ±1 in the corners); a lopsided shape means uneven wear.

Buttons and triggers

Each box fills as you press; triggers show pressure (0–100 %). Standard mapping: buttons 0–3 are the face buttons, 4–5 bumpers, 6–7 triggers, 8–9 Select/Start, 10–11 stick clicks, 12–15 d-pad, 16 home.

Troubleshooting

• Nothing appears: press a button (browsers hide controllers until used). On iPhone/iPad use Safari or Chrome with iOS 16+. Steam Input can hide a controller from browsers — close Steam or disable Steam Input for desktop.
• Wrong buttons light up: the controller uses a non-standard mapping; the labels follow the standard layout, so just note which box reacts.
• Vibration does nothing: only some browser/controller combinations support rumble (Chrome + DualSense/Xbox over USB is the most reliable).

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