Why isn't one measurement enough?
The same symptom can come from stick centering, the connection path, calibration, or the game's deadzone/input layer. One browser result cannot separate all of those causes by itself.
Gamepad · Isolate the source
Gamepad Problem Isolator
The goal is not to show more numbers. First we try to reproduce the issue in the browser; if needed, change one condition and repeat the same measurement.
Sende ne oluyor?
Choose the closest symptom. You do not need to run every test.This test answers:Before asking “how much drift?”, ask “does the problem follow the device, or appear only under a specific condition?”
Define the first condition
We do not guess the connection type; you choose it to avoid a wrong assumption.Device seen by the browser—Press a button to wake the gamepad.
Sticklere dokunma
Keep the controller still. Measurement does not begin until the sticks settle.Release the sticks
We wait for them to remain calm near center briefly.
Left stick—
Right stick—
Preparation0 / 6 sn
Check return to center
Testarya tells you a direction. Push the stick fully that way, then release it completely.Push right
We will tell you when to release after the stick reaches the edge.
Current center distance—No samples yet.
Testarya result
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Change one conditionRepeat the same measurement and compare it with the first result.
A/BCondition comparison
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Show technical details
The browser sees normalized axes from the Gamepad API. This does not directly read the physical sensor or measure a game's deadzone/filtering behavior.
Recent comparisons
Last 6 Gamepad Problem Isolator results in this browser.What does Testarya do differently?
When a result looks suspicious, it does not just say “try another port.” It repeats the same measurement under the condition you choose and compares both results.
What does “only happens in one game” mean?
If the browser measurement is clean and the issue appears only in one game, that does not prove the hardware is healthy. But it is weak evidence for replacing the controller before checking game deadzone, Steam Input/remapping, calibration, or game-specific settings.
Why test return to center separately?
Some sticks look stable at rest but do not return to the same point after movement. For “it drifts after release,” controlled return samples are more useful than static drift alone.
Decision rule: Testarya does not declare the controller “broken.” It shows whether the behavior repeats under the same condition and whether it changes when one condition changes.