HomeReaction Time Test
Reaction Time Test
One side lights up — hit the matching key as fast as you can.
Rounds
Input
Use A with your left hand and L with your right. Safest option — no clash with Windows accessibility shortcuts.
Key check:press any key to test
Both sides at once
Roughly one round in four lights up both sides. Those need both keys to count as a hit.
Hit the key on the side that lights up
L
R
Hit the key on the side that lights up
On mobile, tap the left or right half
About these numbers
Display refresh and input lag add roughly 20–50ms to the absolute figures. Use this to track your own improvement, left/right gap and consistency rather than as an absolute measurement.
A large left/right gap means your non-dominant side is slower. Focusing on the slower side across repeated sessions narrows it.
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