Measured in milliseconds ยท lower is better
Reflex Test
Five trials, median score, and an honest note about what a browser can and cannot measure.
Before you start
The median on mouse is 273 ms. Run the test and we will place you against it.
Compared against
Display refresh rate alone accounts for several milliseconds. Keep the setup constant when comparing.
The other device classes
Trackpad
Touchscreen
Curve is a fitted baseline plus 0 first attempts recorded here. The baseline is a curve, not a sample: no part of it is a real person. Baseline fitted from Human Benchmark's published reaction time statistics (n=81,000,000) (source). That figure pools every input device into one number. Splitting it by mouse, trackpad and touchscreen is our extrapolation, not theirs. Per-device offsets are extrapolated, not measured. The baseline is dropped once a device class holds 5,000 real first attempts. See the full distribution.
Understanding your score
| Band | ms | What it means |
|---|---|---|
| Exceptional | 150 and below | Rare outside trained athletes. |
| Very fast | 151 to 170 | Top few percent. |
| Fast | 171 to 190 | Clearly above the crowd. |
| Above average | 191 to 220 | A solid result. |
| Average | 221 to 260 | The bulk of the distribution. |
| Below average | 261 to 320 | Check sleep and setup. |
| Slow | 321 and above | Something is in the way. Usually not you. |
A reflex and a reaction are not the same thing
A true reflex never reaches your brain. The knee jerk, the pupil contracting, the hand pulling off a hot surface: those arcs run through the spinal cord and complete in roughly 20 to 50 milliseconds. No browser can measure them, and no test that asks you to click a button is measuring one.
What this page measures is a voluntary reaction: see, decide, move. It runs through the cortex, and it lands around 200 to 250 milliseconds for most people. That is five to ten times slower than a spinal reflex, and the gap is the cost of consciousness being involved.
The word reflex is used loosely for both, so this test is named for what people search for. The number it produces is a reaction time, and it is compared against other reaction times.
What a fast result does and does not predict
Simple reaction time correlates weakly with performance in fast games and sports, and much of what looks like superhuman reflexes in expert players is prediction rather than speed. Experts start moving earlier because they read the situation sooner, not because their nerves conduct faster.
Where reaction time is genuinely diagnostic is in tracking your own state. A result that has drifted 40 milliseconds slower than your own baseline is a reliable signal that you are short on sleep, and it shows up before you notice it subjectively.
Using this as a state check
The most useful thing you can do with this number is compare it to your own previous numbers. Population percentiles tell you where you sit among strangers; your own baseline tells you how you are doing today, and that is the more actionable comparison.
Build the baseline over several sessions at roughly the same time of day, on the same device. Five sessions is enough to know your normal range. After that, a result 30 to 40 milliseconds slower than your median, or a noticeably wider spread across the five trials, is a real signal rather than noise.
Sleep debt is the most common cause of both. Alcohol the previous evening is the second, and it shows up the following morning long after people believe it has worn off.
Questions
- How many sessions before my baseline means anything?
- About five, taken at a similar time of day on the same device. Before that you are still learning the task, and the improvement you see is familiarity rather than a change in state.
- Is this measuring my actual reflexes?
- No. It measures voluntary reaction time, which involves your brain. True reflexes complete in the spinal cord in 20 to 50 milliseconds and cannot be measured through a screen and a mouse.
- How do I improve my reflexes?
- Fix sleep first, since it is by far the largest reversible factor. Remove distractions second. Practice produces a quick early gain that is mostly task familiarity, then flattens out. Genuine physiological improvement is small.
- Do athletes score better on this?
- Slightly, on average, and less than most people expect. The advantage trained athletes have in their sport comes mostly from anticipation and pattern recognition, neither of which this test allows.