GameSir T4 Pro Tester
Connect a controller and press any button — every input is detected and displayed live.
Connect a controller and press any button
Browsers hide gamepads until first input. Plug in via USB or pair over Bluetooth, then press any button to wake the test. On phones, pair the controller in your system Bluetooth settings first.
Buttons
Analog sticks
Circularity test
Rotate a stick around its full rim — we trace the path against a perfect circle.
How it works
The GameSir T4 Pro is a multi-platform pad that changes its device identity depending on which mode you boot it into. That flexibility is also its main testing trap: the same physical buttons can map differently in PC mode versus Android/Bluetooth mode.
How to connect your GameSir T4 Pro
2.4GHz dongle, Bluetooth, or wired USB-C. Hold Home + A for Android/Bluetooth mode, Home + X for PC mode.
How the GameSir T4 Pro maps in your browser
Boot in PC mode (Home + X) for the cleanest standard browser mapping; Android/Bluetooth mode (Home + A) reports different device IDs and indices. If the buttons look wrong, you're likely in the other mode — reconnect in PC mode.
Thumbstick type and drift risk
Potentiometer thumbsticks with configurable behaviour via GameSir's app. Standard drift-checking applies.
Rechargeable battery; connects by 2.4GHz dongle, Bluetooth, or wired USB-C.
Known issues and quirks
Reports different device IDs per mode; if buttons look wrong, reconnect in a different mode.
Once connected, press any button and the tester will detect the pad automatically. Check every button and trigger registers, watch the stick crosshairs for centering, and run the circularity test to quantify stick wear. Suspect drift? Run the dedicated controller drift test for a 10-second automated verdict.
Testing every part of your controller
Browsers hide gamepads until you press a button, so tap any button once to wake the connection. From there, every button, trigger, analog stick and (on supported hardware) vibration motor is displayed live. It works with anything your OS recognizes as a gamepad — Xbox, PlayStation DualShock 4 and DualSense, Switch Pro, and most generic USB or Bluetooth pads.
What to check, and what's normal
| Element | Healthy behavior | Warning sign |
|---|---|---|
| Face & shoulder buttons | Register instantly, release cleanly | Sticky, missed, or double inputs |
| Analog sticks (at rest) | Under 1–2% jitter around center | A constant offset = drift |
| Triggers | Smooth 0–100% travel | Jumps to 100% or won't reach it |
| Vibration | Rumbles on command (Chromium pads) | Silent on Safari/Firefox = browser limit, not the pad |
Troubleshooting connections
- Nothing appears: press any button first; if still hidden, try another USB port or re-pair Bluetooth and reload.
- Layout doesn't match your pad: unknown models fall back to a generic view, but every button and axis is still shown by index — you can fully test it.
- Vibration does nothing: rumble over the web works on Chromium browsers with most Xbox and DualSense pads; Safari and Firefox have limited or no support.
If the sticks jitter beyond a couple of percent at rest, run the dedicated controller drift test for a measured verdict.
Troubleshooting
› My controller is connected but nothing shows
Browsers hide gamepads until you press a button — press any button once. If it still doesn’t appear, try a different USB port or re-pair Bluetooth, then reload the page.
› Vibration test does nothing
Vibration via the browser works on Chromium browsers with most Xbox and DualSense pads. Safari and Firefox have limited or no support — that is a browser limitation, not your controller.
› The layout doesn’t match my controller
Unknown models fall back to a generic layout. Every button and axis is still shown by index, so you can fully test the pad even without a matching picture.
Frequently asked questions
› Which controllers are supported?
Anything your OS recognizes as a gamepad: Xbox (360/One/Series), PlayStation DualShock 4 and DualSense, Switch Pro, and most generic USB or Bluetooth pads.
› Do I need to install anything?
No. The test uses the browser’s built-in Gamepad API — just connect your controller and press a button.
› Why do axis numbers jitter slightly at rest?
Analog sticks always have a little electrical noise, typically under 1–2%. Constant offsets beyond that suggest drift — run the dedicated drift test.
› Can I test controller vibration?
Yes, on Chromium-based browsers with supported pads. Click the vibration button; if nothing happens, your browser or pad doesn’t expose rumble to the web.
Common GameSir T4 Pro problems and how to read them
These are the faults reported most often for the GameSir T4 Pro, what causes each one, and how to confirm it in the tester above before you spend money on a repair or replacement.
| Symptom | Cause | What to do |
|---|---|---|
| Buttons map differently than expected | Booted into the wrong mode (Android vs PC). | Power on with Home + X for PC mode, then reconnect. The layout should normalise. |
| Different device ID each session | The T4 Pro presents different IDs per mode. | Pick one mode and stick with it. If detection is inconsistent, that's the multi-mode behaviour, not a fault. |
| Extra rear buttons don't register | They need mapping in the GameSir app. | Assign them, then confirm the mapped button fires in the tester. |
Testing tip: Test in Chrome specifically — GameSir multi-mode pads have the broadest, most predictable mapping under Chromium's gamepad implementation.