Quick! Reaction Speed Test

Three senses × two actions, six modes to push your limits. Millisecond-precise timing reveals your true reaction speed — and tracks every improvement.

Quick! measures your reaction time down to the millisecond.

Wait on the ready screen — the cue appears at a random moment, and you react as fast as you can. Six modes combine three senses with two actions:

• Visual: the instant the screen changes colour • Audio: the instant the tone sounds • Haptic: the instant the phone vibrates × Tap the screen, or flick the phone (quick-draw style)

Five trials per round give you your average, best and worst, plus a performance grade. Jumping the gun — reacting before the cue — doesn't count and re-runs, so every number is real.

Why trust the numbers? Quick! times everything on the system's high-precision monotonic clock, subtracting the stimulus's true onset from your response's hardware timestamp — eliminating the tens of milliseconds of lag most apps carry. You can even measure real effects like "audio is faster than visual."

■ Six modes: visual / audio / haptic × tap / shake ■ Millisecond-precise timing ■ Full history with trend charts to track your progress ■ Traditional Chinese, English and Japanese ■ Sleek dark, e-sports-style interface

Push your limits and see how fast you really are.