How to use
- Tap test: press start and tap the pad or press Space in time with the flashing circle, then in time with the clicks.
- Your own timing is measured with the flashes, so the difference to the clicks shows how late the sound arrives.
- Loopback test: turn the speaker volume up, allow the microphone and stay quiet. Six clicks are played and recorded.
- Repeat each test a few times; the results move by a few milliseconds from run to run.
Frequently asked questions
What is a normal Bluetooth delay?
Standard Bluetooth headphones usually add 150–250 ms. Low-latency codecs such as aptX Low Latency or LE Audio and gaming modes bring this down to about 40–80 ms. Wired headphones add almost nothing.
How accurate is the tap test?
It compares your tapping to sound and to light, so your personal habit cancels out. Expect about ±20 ms. The more evenly you tap, the better the result.
What does the round trip include?
The time from the browser starting a sound to the same sound arriving back from the microphone: output buffering, the sound card, the air gap and input buffering. Audio interfaces with ASIO-like drivers reach 10–20 ms; typical laptops measure 30–100 ms in browsers.