音への反応時間を Web Audio API でミリ秒単位で計測. ブラウザだけで実行でき、ダウンロードや登録は不要です。
Instructions
Click or tap the black stage to start a round. A beep will play after a random 1.5–4 second delay — click as fast as you can when you hear it. Keep headphones or speakers on. Pressing Space also works.
Click to start
A beep will play after a random delay. Click immediately when you hear it.
—Last (ms)
—Average
—Best
—Worst
Tip: wired headphones give more accurate results than Bluetooth (BT audio adds 40–200 ms of codec latency).