ControllerTest – Free Gamepad Diagnostic Tool

ControllerTest is a free browser-based gamepad diagnostic tool for developers, repair technicians and players.Launch ControllerTest: https://controllertestonline.com/

Test controller buttons, analog sticks, triggers, stick drift, deadzone, circularity, browser-visible polling rate and vibration support. Results can be exported as JSON or CSV for debugging, repair notes and before/after comparisons.

It supports Xbox, PlayStation, Switch and generic USB/Bluetooth controllers. Controller data is processed locally in the browser.