Performance · 2026-04-10
Test a controller on PC
A browser tester answers whether the computer received the input. It does not replace the OS driver panel or a hardware poll-rate probe.
What to check first
Start on the homepage. Press every button, rotate both sticks, pull both triggers, then run the 3-second drift sample. If the mapping line is not standard, trust raw indexes. Windows’ own controller panel and Steam are useful for a second opinion. They are not the same measurement.
- Verification: does each press arrive?
- Drift: is the center quiet?
- Timing: compare USB and Bluetooth sample age.
Confirm the reading on the live tester before you buy parts or change firmware. The number on that page is what your browser actually receives.
A practical next step
Repeat the same test after each change and write the resting radius down. A fix that does not move that number did not fix the sensor. If the offset stays above about 0.12 with your hands off the sticks, plan a module replacement rather than another software pass. Model notes live in the controller library.
Frequently asked questions
Does this page change my controller?
No. GamepadTesters only reads the Gamepad API in your browser. Calibration writes, firmware updates, and stick swaps happen in the maker’s tool or at a repair bench.