Device Test
Before a meeting, stream or game: check the camera image, mic level, left/right channels, keys, mouse clicks/wheel and gamepad buttons/sticks. Everything runs locally; video/audio are not uploaded, and permission or busy-device errors are shown directly. Use it when a device works in one app but fails in another.
Camera
VideoCheck motion, color and for green/glitch frames.
Microphone
AudioSpeak and watch the meter; pinned or dead means check permission/gain.
Speakers
L / RTest left/right separately; both should play without distortion. Headphones help.
Keyboard
0 keysLast key: — · Every key should highlight; dead/double keys need attention.
Mouse
PointerClicks: 0
Gamepad
Gamepad APINo gamepad; connect and press a button.
Check button indices and stick centering; browser support varies.
Everything runs locally: video/audio are not uploaded, and key/mouse events are only shown on this page.