Reaction Time

Test your reflexes

Tap to start, then watch the box and wait. After a random pause it turns green — and the instant it does, tap as fast as you can. Quibzo measures the milliseconds between green and your tap and remembers your fastest time this session. The random delay is deliberate: it means you can't anticipate the change, so you're measuring true reaction, not a lucky guess. Jump the gun and tap before green and it'll tell you that you went too soon, so you just reset and try again.

What's a good reaction time?

Average human reaction time to a visual cue is roughly 200–300 milliseconds, so anything consistently under 250 ms is genuinely quick, and under 200 ms is excellent. Remember that some of that number is unavoidable — it's the time for the light to reach your eye, your brain to process it, and the signal to travel to your finger — so don't expect superhuman scores. What's most interesting is using it on yourself as a quick alertness check: try a few rounds when you're tired, then again after a coffee, a walk, or a good night's sleep, and watch the numbers move. It's a small, honest window into how switched-on you are right now.

Reaction time benchmarks: how do you compare?

Studies of simple visual reaction time put the typical adult around 200–250 ms. Here's a rough scale to place your best score on:

• Under 150 ms — exceptional, near the limit of human nerve speed (fighter pilots, F1 drivers, pro gamers live here)
• 150–200 ms — excellent; typical of trained gamers and athletes
• 200–250 ms — the average, healthy range for most adults
• 250–300 ms — a little slower, often just tiredness or distraction
• Over 300 ms — try again rested; it's very sensitive to fatigue

Age matters too: reflexes are quickest in the teens and twenties (averaging around 210–220 ms) and gradually slow with age — by the seventies the average is closer to 330 ms. A chunk of every score is fixed physics (light hitting your eye, the nerve signal reaching your finger), so 100 ms is about as low as a human goes. The most useful trick is to compare yourself to yourself: test tired, then after a coffee, a walk, or a good night's sleep, and watch how much sharper you get.

Best of three or five makes a fun, fast competition — pass the phone around and see who's quickest. For a different finger test, see how many taps you can land in ten seconds on Tap Speed.

Frequently asked questions

What counts as a good reaction time?
Average human reaction time is around 200–300 milliseconds, so anything under 250 ms is genuinely quick.

Why did it say "too soon"?
You tapped before the box turned green. Wait for green, then tap as fast as you can.

Can I improve my reaction time?
A little — being well-rested and alert helps, and practice sharpens your timing. Try a round when tired and again after a coffee to see the difference.