What’s acting up?
Pick the symptom. The right test opens and runs in this browser tab, with nothing to install and nothing uploaded.
- My mouse clicks twiceDouble click test
- A key doesn’t respondKeyboard tester
- My character moves on its ownStick drift test
- People can’t hear me on callsMic test & playback
- Sound only comes from one sideLeft / right audio test
- There’s a dot on my screen that won’t go awayDead pixel test
- A mouse button or the wheel does nothingMouse tester
- My mouse feels choppy or laggyMouse polling rate test
Every test, by device
Before you replace it
See what your browser actually receives. Then compare ports, cables and another computer before deciding what to fix.
Nothing leaves your device
Clicks, key presses, controller values and recordings are processed in the page. There are no accounts and no uploads.
Honest about limits
A browser is not a lab instrument. Every test says what it can measure and where drivers or the operating system get in the way.