When the lights go out, tap. That’s the whole test — and it measures you to the millisecond, the same way Formula 1 measures race starts. Most people land around 250ms on a visual cue; trained athletes and top gamers live below 200. Touchscreens add a little latency, so compare against yourself on the same device.
▶ START THE TEST| Average adult (visual) | ~250 ms |
| Excellent | under 200 ms |
| F1 driver territory | ~150–200 ms |
| Your score | one tap away |
Around 250 milliseconds for a visual stimulus. Under 200ms is excellent. Audio cues are typically 20-40ms faster than visual ones.
Yes — it runs instantly in your browser with no download or sign-up, and you can retry as many times as you like.
Touchscreens add input latency compared to a mouse or keyboard. For a fair benchmark, compare runs on the same device.
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