Free online · Visual response
Reaction Time Test
Take the free reaction time test: click or tap to start, wait for mint green, then react.
How to take the reaction time test
- Start: click or tap the panel once. For keyboard input, focus the panel with Tab and press Space or Enter.
- Wait: the panel turns red and says Wait. Do not respond yet.
- React: when the panel turns mint green and says React now, respond once. Your reaction time test result appears in milliseconds (ms).
Each round records one response. Select Try Again for another round or Share Your Score to copy the reading. Use the same device and input method.
How to understand your reaction time test result
- This round: your latest recorded interval. Lower means a faster response on this setup.
- Best: your lowest valid saved reading.
- Average: the mean of all valid readings currently saved in this browser, including previous visits. It is not a five-round or training-set average.
The history curve shows your latest 20 readings once at least two are saved. Compare several attempts instead of drawing a conclusion from one unusually fast click. Rating names are site reference bands; the labeled model estimate is not a measured population rank.
Reaction time test measurement rules and influences
This reaction time test measures one visual cue followed by one response. For the definition and other task types, see What Is Reaction Time?.
- Timing: a random 1.5–6 second wait precedes the signal. Timing starts in the frame callback that changes the cue and stops at an accepted input event.
- Invalid rounds: early responses, readings below 80 ms and rounds interrupted by leaving the page do not enter your score history.
- Repeated input: inputs within 100 ms of the last processed input are ignored. Held keys, right clicks and additional touch contacts do not count.
- Conditions: the screen, input device, browser and your attention can affect a reading. Keep them consistent. Browser timing does not isolate biological latency.
Frequently asked
Is this reaction time test free?
Yes. Start in your browser without an account or download. Enable JavaScript to run the timer.
Can I take the reaction time test on my phone?
Yes. Tap once to start, wait for green, then tap again. Keep the same phone and input method when comparing readings; touch and mouse input include different device delays.
Can I use the keyboard?
Yes. Focus the test panel with Tab, then use Space or Enter to start and respond. Holding a key does not produce repeated attempts. Use the same input method for comparisons.
Why did my attempt not count?
An early response or a reading below 80 ms is excluded. Leaving the page during a round also voids it. The cutoff is a site filtering rule, not a universal biological limit. Select Try Again to start a new round.
Why is the wait different each round?
The signal appears after a random wait of 1.5–6 seconds. Wait for the visible change instead of predicting a fixed countdown.
Where are my reaction time test results saved?
Up to 200 valid readings are saved in this browser. They do not sync across devices. Clearing site data removes them. If storage is blocked, the current result still appears with a notice that it could not be saved. Training sets have separate history.
Ready for another round?
Back to the reaction time test