A
Web product
Added November 12, 2026
About the product
Audio Delay Test is a free set of browser tools for finding out how far sound lags behind the picture on headphones, speakers and TVs. On the homepage you line up a flash and a beep with a slider, or use a tap test or a full-screen loop. The audio latency test plays five short chirps, records them with your microphone and uses cross-correlation to time the round trip, with no tapping. The Bluetooth test has you tap along to a beat on wired sound and then on wireless headphones; the difference is the delay Bluetooth adds. The lip sync test shows a full-screen pattern with beeps and a frame counter, plus a calculator for slow-motion video. Results are estimates of the whole playback chain, and verdicts use the averages in ITU-R BT.1359. No app, no account, nothing uploaded.
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