Hardware
Gamepad Tester
Plug in or pair a controller, then press any button. Buttons, triggers and sticks show live, and you can check for stick drift and test vibration.
No controller detected
Press any button on your controller. Browsers only reveal a gamepad after it is used.
Buttons
Sticks and axes
Checks
For the drift test, let go of the sticks completely. It samples for 3 seconds and reports how far each stick strays from centre.