Reaction time test.
Wait for green. Make your move.
Five rounds to find your average.
Five valid rounds make a score. Click, tap, Space or Enter all work.
- Valid rounds
- 0 / 5
- Running average
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- Total tries
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- Failed starts
- 0
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This visit · 0 total tries · 0 failed starts · No scored rounds yet
Tries = valid rounds + early clicks. Failed starts do not affect your average. Visit totals reset when you reload or switch modes.
This week’s top 10.
Click · Five-round average Resets Monday · 00:00 UTC
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How spots are earned
Lower five-round averages rank higher. Five valid rounds make a score; early clicks are recorded as failed starts and are excluded from the average and the five valid rounds. Each browser gets one best spot per mode, with ties going to the earlier score. Every ranked round must be between 80 ms and 10 seconds. The board resets Monday at 00:00 UTC. Scores are measured in the browser and are not independently verified; devices and input methods affect results.
Completed scores are stored for 30 days. Names and brands appear only when you publish them; you can remove yours from this browser. Keep names respectful and use only a brand you are allowed to represent. Privacy details · Report a name.
How to take the reaction time test
ReactionCheck is a free online reaction time test. It measures the time between a colour change and your click, tap or key press in milliseconds (ms). Complete five rounds to see your average and fastest response. No account is needed.
- Click or tap the box, or press Space. It turns red.
- Wait. After a random 1.5 to 4.5 seconds it turns lime. Click as fast as you can.
- Do five rounds. You get the average, your best round, and a comparison with a published reference.
More free reaction and hardware tests
From your reflexes to your favourite mouse. Pick a test and jump in.
What is a good reaction time?
For context, Human Benchmark reports a median of 273 ms for its visual reaction test. That is a reference from another website, not a measured distribution of ReactionCheck users. Your device, input method and test conditions affect the result, so a lower score does not by itself establish athletic ability or gaming skill.
Your score includes display, audio and input delays as well as your response. A 60 Hz frame interval is about 16.7 ms; at 144 Hz it is about 6.9 ms. These intervals are not the complete device latency: panel processing, input hardware and browser scheduling add varying delays. Compare repeated sessions on the same device and input method rather than subtracting a fixed hardware allowance.
Why the F1 test is different
In our F1 reaction test, five lights come on one per second and go out after a random 0.2–3 second hold. React to lights going out instead of a panel turning green. This is a browser simulation: clicking a mouse cannot reproduce a driver releasing a clutch or a car starting to move. Compare repeated sessions on the same setup.
How to improve reaction time
Use the same device and input method for each session, take breaks, and keep distractions low. A few practice rounds help you learn the controls. Avoid anticipating the signal: a lower number from guessing does not measure a faster reaction. This tool is for practice and comparison, not medical assessment.
Keep display and input settings consistent. Power-saving modes, background work and a change of mouse, keyboard or audio output can change your result. An equipment change does not by itself show that your reactions improved.
How is reaction time measured?
Each round draws a fresh random delay between 1500 and 4500 ms. When the panel switches to lime the page records performance.now(), a monotonic clock whose precision may be reduced by browser privacy settings, and records it again on your input. The difference is your time. Input is captured on pointerdown, so the clock stops the moment your finger goes down, not when the click completes on release. Space and Enter are captured on key down for the same reason.
Clicking early cancels the round. Your average reaction time is the sum of five completed round times divided by five; “best” is the fastest single round. For the visual test we show the difference from Human Benchmark’s published 273 ms median. The community leaderboard is not a population benchmark and does not calculate a validated percentile. The browser clock starts before the physical display or speaker finishes presenting the signal, so equipment latency is included.
Frequently asked questions
What is the average reaction time?
Human Benchmark reports a 273 ms median for its visual test. Results vary by test, device and input method; this is an external reference, not an average measured on ReactionCheck.
What is a good reaction time for gaming?
Use your own repeated average as a baseline. A quick response can help, but aim, anticipation and decision-making also matter. This simple test does not predict gaming performance.
Why is my reaction time slower on a phone?
Touch input, display refresh and browser processing can add different amounts of delay. Compare phone scores with scores from the same phone and input method.
Does my monitor affect the score?
Yes. A 60 Hz frame interval is about 16.7 ms; at 144 Hz it is about 6.9 ms. Display processing and browser scheduling add variable delay. Keep the same screen and settings when comparing scores.
Why did I get "Too early"?
You clicked before the box changed. The round resets because a guess is not a reaction. Keep your hand still, do not count the seconds, and wait for the colour.
Is 300 ms a bad reaction time?
A single score cannot establish whether your reactions are good or bad. Your device and test conditions affect it. This page is not a medical test.
How many attempts should I do?
Each session uses five attempts to reduce the influence of one unusually fast or slow round. Compare several sessions under similar conditions rather than one best score.
Can I use the keyboard instead of the mouse?
Yes. Space or Enter starts a round and stops the clock on key down. Keep the input method consistent when comparing sessions.