About This Launch
Audio Delay Test is a set of free browser tools with no signup: a sync slider, a tap test, a Mic Latency Test, a Bluetooth Delay Test, a Lip Sync Check and a Left/Right Sound Test. The page cites ITU-R BT.1359, with about 125 ms noticeable and 185 ms unacceptable. Only the Mic Latency Test uses the microphone, and only with your permission.
Why I Built This
Find out how many milliseconds your sound lags. Line up a flash and a beep, run an automatic microphone loopback test, compare wired vs Bluetooth headphones, or check TV lip sync with a full-screen pattern. Free, no sign-up, runs in your browser.
Launch Details
CategoryProductivity
StageLive
ListedNovember 1, 2026