Buttons and triggers Press any button and watch it light up instantly: face buttons, shoulder buttons, D-pad, stick clicks, Start and Select. Analog triggers show their exact pressure value, so a trigger that no longer reaches a full pull — or never returns to zero — is obvious at a glance. Analog sticks and stick drift Both sticks are drawn live with their raw X and Y axis values. Put the controller down, touch nothing, and any movement you see on screen is stick drift. Check the dead zone, confirm each stick reaches its full range in every direction, and catch a stick that no longer re-centres. Rumble and vibration Fire the controller's vibration motors on demand and confirm both sides still respond. Controller information Read the connected device's name, vendor ID and product ID, plus any keycodes your controller sends that Android doesn't map to a standard button — useful for off-brand and clone pads. WHY YOU MIGHT NEED IT Buying a used controller and want to check it before the return window closes. Losing aim in shooters and suspecting drift rather than your own aim. A button that fires twice, or doesn't fire at all. Working out whether a pad is faulty or simply unsupported by the game. Confirming a new Bluetooth pad paired properly before a long session. WORKS WITH Xbox, PlayStation, Nintendo, 8BitDo, GameSir, Razer Kishi, Backbone and generic USB or Bluetooth gamepads — anything your Android device recognises as a controller. Connect by USB cable, USB-OTG adapter or Bluetooth. HONEST ABOUT WHAT IT DOESN'T DO This app diagnoses controllers, it doesn't repair them. It will show you drift precisely, but it cannot calibrate or fix a worn potentiometer — no app can do that in software on a stock Android device. Free to use, in English, French and Arabic. A short ad now and then keeps it that way.