Initializing, please wait a moment

Click Play Left, Play Right, or Play Both; use headphones to confirm each channel.

Tone frequency (Hz) 440 Hz

Channel cue

Click Play Left, Play Right, or Play Both. A short tone plays through that channel only - nothing is uploaded.

Test left and right speaker channels with a short in-browser tone. Click Play Left, Play Right, or Play Both; adjust the frequency, then Stop. Everything runs in the browser - no microphone, no upload, and no account.

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Last updated: Jul 21, 2026

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Loading reviews...

Does this use my microphone?

No. The tone is generated with the Web Audio API. Nothing is recorded and no microphone permission is requested.

Why do I need to click Play?

Browsers block autoplay of audio until you interact with the page. A click on Play Left, Play Right, or Play Both starts the AudioContext.

How do I tell left from right?

Use headphones. Play Left should be louder in the left ear; Play Right in the right ear. Play Both sends the same tone to both channels.