How to use
- Connect the controller, then press any button. Browsers only expose a controller after an input.
- Press every button; analog triggers show how far they travel.
- Leave the sticks alone to check drift, then rotate them slowly along the edge for the circularity test.
- Use the vibration button to test the rumble motors.
Frequently asked questions
What is stick drift?
When a stick at rest reports movement, the game moves without your input. Values above about 0.08 at rest usually mean a worn stick module.
What does circularity error mean?
It is how far the stick outer edge is from a perfect circle. Many controllers land between 5 and 15 percent; high values can make diagonal movement feel off.
My controller is connected but not shown.
Press a button while this page is open. If it still does not appear, reconnect it or try another browser; some controllers need Steam or a driver to show up.