Audio
1 to 3 minutes · Runs in this browser
Use repeated audio and visual pulses to manually calibrate the perceived offset from Bluetooth headphones, speakers, TVs, monitors, or other output paths. Results are clearly labeled as human-observed correction rather than fake hardware measurements.
Play a synchronized flash and beep, then adjust the correction until they feel aligned to you. Headphones are recommended.
Start at low volume. This manual calibration reports your perceived correction; a browser cannot directly inspect Bluetooth radio latency.
Adjust the slider, then replay the pulse until the flash and beep feel aligned.
Transparent method
This tool reports only interactions and browser APIs it can observe. It does not infer hidden hardware specifications or turn unsupported access into made-up results.
Useful context
Not reliably. Bluetooth and operating-system output buffering are not exposed as a precise end-to-end measurement, so this tool uses transparent manual perception-based calibration.
A positive value delays the audio pulse. A negative value delays the visual pulse. Adjust until both appear synchronized to you.
Troubleshooting
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