Output
Response time and median, milliseconds
UserBenchmark / All Tools / Reaction Time Test
Clicks & training
Reaction Time Test
Wait for green, then react to measure your response in milliseconds.
Free to useNo downloadNo sign-up
Reaction Time Test · At a glance
Quick answer: Wait for green, then react to measure your response in milliseconds. The result includes human response and the browser input/display path.
Reaction Time Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Wait for the visual cue before clicking.
- Complete several valid rounds and use the median to reduce the influence of one lucky anticipation or distraction.
Input
Visual or auditory cue, followed by input
Browser requirement
Animation timing; Web Audio for sound cues
Processing
Runs on your device; no tool-result upload
How it works and what the result means
The displayed time includes your reaction, browser scheduling and input/display or audio delay. It cannot isolate the physical latency of a monitor or mouse.
Reading the result
The result includes human response and the browser input/display path. A lower median under identical conditions indicates a faster observed response in this task.
What to check next
An early click invalidates the attempt. Keep the tab visible, use the same input device and avoid comparing a touchscreen round directly with a mouse round.
An early input ends that attempt. Restart and wait for the cue. Compare medians on the same browser with background workloads closed.
Frequently asked questions
Can this measure my monitor response time?
No. Human reaction is part of the result. Panel response and end-to-end latency need suitable external measurement; subtracting a guessed human baseline does not isolate them.
How do I start the Reaction Time Test?
Start a round and wait without pressing. React only after the color changes or the sound plays. Complete several attempts to see the median.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.