Paint-aware start
The clock is anchored to the animation frame that presents the green signal.
Visual response instrument
Reaction Time Test
TRIAL1 / 5
STARTFive trials. Press when the signal turns green.
VALID0
FALSE STARTS0
RUN AVG-
BEST-
Stored on this device
Recent runs
Your completed runs will appear here. Nothing leaves this device.
Measurement method
What the number includes
Your result is the elapsed browser time from the painted signal to the captured input event. It reflects this complete setup, not only the speed of your nervous system.
Down-event capture
Pointer down, Space, and Enter are captured before a delayed click event.
Five visible samples
Average, median, best, variation and flagged outliers remain inspectable.
Hardware still matters
Display refresh, mouse, touchscreen, keyboard, OS load and browser scheduling affect the score.
Broad interpretation
Read the range, not a diagnosis
150 ms or lessExceptional
151-175 msExcellent
176-200 msVery quick
201-230 msQuick
231-270 msTypical-quick
271-320 msTypical range
321-400 msSlower
401-500 msVery slow
More than 500 msRetest suggested
These are Reaction Test Lab's descriptive browser bands, not population percentiles or age norms. They cannot identify a medical or cognitive condition.
Questions
Reaction time test FAQ
Why does my result change between devices?
Each device adds different display, input, operating-system and browser latency. Compare repeated runs on the same setup for the most useful personal trend.
Is a phone result comparable to a mouse result?
Not precisely. Touchscreens and mouse systems have different latency paths. The result records the input class so you can keep comparisons honest.
What happens if I click too early?
It is counted as a false start and the same trial slot restarts. False starts never enter your valid reaction statistics.
Can repeating this test train my reaction time?
Repeated sets can improve familiarity and response strategy, but they do not prove a change in underlying health or neural speed. Use two or three short sets on the same setup, rest between sets, and track the median and consistency instead of chasing one fastest click.
Can this test assess ADHD, dementia, concussion, or another condition?
No. It is an entertainment and personal-comparison browser tool, not a validated medical or neuropsychological assessment.
Where are my past results stored?
The latest 20 runs stay in this browser's local storage. You can clear them from the history section, and they are not sent with anonymous product analytics.