how to play jolt
Jolt is a free reaction time test. Wait for the screen to turn green, then tap as fast as you can. We take five tries and show your average in milliseconds.
- Press play, then wait while the screen is dark.
- The moment it turns green, tap anywhere (or press any key).
- Tap before green, or within 100 ms of it, and that try doesn't count. Nobody reacts that fast, so it was a guess. Tap again when you are ready.
- Each time lands on a small scale next to the typical human range, so you know at once how it went.
- After five good tries you get your average. Lower is better.
Keyboard: Any key works as a tap. Esc goes back to the menu.
tips
- Rest your finger on the screen or the key so there's no travel.
- Watch the middle of the screen, not the edges.
- Don't guess. The wait is random, between one and a half and five seconds.
faq
What is a good reaction time?
Most people average 250 to 300 milliseconds on a phone. Under 200 is quick. Under 150 is exceptional.
Why is my score slower on some devices?
Screens and touch panels add a little delay of their own, usually 10 to 50 ms. Compare scores on the same device.
Is the timing accurate?
We turn the screen green inside the browser's frame callback and start the clock on that frame, then compare it with the exact timestamp of your tap. Held keys never count, and a hidden tab restarts the wait.
Why did a fast tap count as too soon?
Anything under 100 ms after green is faster than a human can react to something they see, so it is treated as a guess. It shows up as a jump-start on your results.