Audio device tests
Check that your microphone is picking up sound and your speakers play both channels — right in the browser, with nothing sent to a server.
Microphone test Check that your microphone works in seconds. Press the button, allow access, and watch the live level meter react to your voice. Audio is processed only in your browser — nothing is recorded or sent anywhere. Stereo / left-right speaker test Confirm your speakers or earbuds work and aren't wired backwards. Play a tone through the left channel, the right channel, or both, using the Web Audio API — entirely in your browser, with nothing sent to a server.