What controllers work?
Most USB and Bluetooth controllers exposed through the browser Gamepad API, including many Xbox, PlayStation, and generic pads.
CTRLCHK / Test your controller
See every input. Measure what matters.
Live controller diagnostics for drift, buttons, triggers, and range — entirely in your browser.
Waiting for controller
Connect via USB or Bluetooth, then press any button.
Browser connection
No driver or download needed.
Your browser reads the controller directly. Nothing is uploaded.
Preview with demo inputUnderstand the signal
Useful answers, below the tool.
What is stick drift?
Movement reported while a stick is resting. CTRLCHK shows the raw offset, robust P95, peak, and jitter separately.
What is a deadzone?
A software area around centre that ignores small movement. Our estimate uses resting P95 plus a documented safety margin.
Does CTRLCHK diagnose defects?
No. Health labels are product guidance, not universal hardware specifications. Your observed measurements always remain visible.