Tool Nova / Play Games
Reaction Time Test - Measure Your Response in Milliseconds
Wait for green, then tap or press a key to measure your reaction time in milliseconds. Try again and compare results on the same device.
Speed test
Reaction Time Test
Test how quickly you can react when the screen changes. Works with mouse, touch, or keyboard.
Keyboard users can press Space or Enter after focusing the test panel.
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How to play Reaction Time Test
Select New game and wait for the panel to turn green. Clicking before green records a false start.
Tap the green panel, or focus it and press Space or Enter. The result measures elapsed browser time in milliseconds.
Repeat several times on the same device. Display refresh rate, input hardware, and browser delays affect the result; this is a casual game, not a medical or diagnostic test.
Frequently Asked Questions
Why do results differ between devices?
Screen refresh, touch or keyboard input latency, and browser scheduling all contribute to the measured time. Compare trials on the same device instead of treating the result as a laboratory measurement.
Where is my best result saved?
Your best time is stored only in this browser when local storage is available. Clearing browser data removes it; the game still works when storage is blocked.
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