Reaction Time Test — Find Out How Fast Your Reflexes Really Are

It measures your simple visual reaction time — the gap in milliseconds between a green target appearing on screen and your click landing on it. The timer starts the instant the target becomes visible and stops the moment your mouse button registers. After all rounds finish you get an average across your chosen number of rounds, a best single-round time, and a tier rating. All results stay in your browser and nothing is sent anywhere.

Almost certainly not. The hard floor for a genuine human visual reaction is around 100–120 ms even under the best conditions. A result below that almost always means you clicked during the random wait before the target appeared — a false start that was missed. If you keep seeing very low numbers, try to slow down and wait until the green circle is clearly visible before clicking. Genuine reaction speed is built over weeks of practice, not in a single lucky tap.

False starts happen when you click before the target shows up — usually because you are trying to guess when it will appear. The wait delay is random between 1.5 and 4 seconds on purpose so there is no pattern to guess. The fix is to relax your hand during the yellow phase and only fire when you can see the green circle. Fewer false starts lead to a more honest average score and better muscle discipline overall.

A little, yes. A mouse with a 1000 Hz polling rate registers your click with about 1 ms of input delay. A standard 125 Hz office mouse adds up to 8 ms. That difference matters when you are competing for the fastest possible score, but for most people the bigger gains come from practice and sleep rather than hardware. A wired mouse on Chrome or Edge gives the lowest total input lag for this test.

Yes, slightly. A 60 Hz screen takes up to 16.7 ms to show each new frame, so the target may appear on screen up to 16.7 ms after the timer starts. A 144 Hz screen brings that gap down to under 7 ms. If you always test on the same screen your scores are perfectly comparable to each other over time. The display delay only becomes important when comparing scores across different machines or monitors.

Five rounds is the standard most people use when sharing scores online. Ten rounds gives you a more reliable average because the odd lucky or unlucky round has less effect. For serious progress tracking, run 10-round sessions once a day and note only the average — the best and worst individual rounds tell you less than the overall trend across multiple sessions. Always use the same round count when comparing scores with other people.

Round-to-round swings of 20–60 ms are completely normal. Your brain does not run at a fixed clock speed — attention, muscle readiness, and eye focus all shift slightly from one moment to the next. The target also appears at a different spot each time, so a target that pops up far from your cursor adds a small movement penalty on top of your pure reaction time. This is exactly why your average across several rounds matters more than any single result.

Yes. Touch taps are handled the same way as mouse clicks and register at the same precision. Bear in mind that touchscreen displays often have slightly higher input latency than a wired mouse — typically 20–40 ms extra — so your mobile scores will tend to be a bit higher than your desktop scores. Enable Touch-Optimised Mode in Settings to widen the tap targets and make the test easier to use on smaller screens.