About Reaction Time Test
This is the simplest test on the site and the one people repeat the most. The panel is red. At an unpredictable moment it turns green. You click. The number you get back is your visual reaction time in milliseconds — the total gap between photons hitting your retina and your finger completing the click.
The average adult lands somewhere between 200 and 300 milliseconds, with about 250ms being typical. Roughly 80ms of that is your eyes and visual cortex, another chunk is the decision, and the rest is the physical travel of your hand. Because the test runs five rounds and averages them, it filters out the single lucky click that flatters everyone.
How to play
- Click or tap the panel to start a round. It turns red and waits.
- The wait is random, between roughly one and five seconds, so you cannot time it.
- The instant the panel turns green, click as fast as you can.
- Clicking while it is still red counts as a false start and the round restarts.
- After five valid rounds you get your average, which is what gets saved as your personal best.
Five tips that actually move your score
- Rest your finger on the button. A large part of a slow score is travel distance. Hover with your finger already touching, ready to press.
- Watch the whole panel, not one point. Peripheral vision detects changes in brightness faster than focused central vision does.
- Don't try to predict. Anticipating the switch produces false starts, and the fear of false-starting then makes you hesitate. Just react.
- Take the test rested. Reaction time is one of the first things sleep debt degrades — a tired result can be 30 to 50ms slower than your real baseline.
- Use a wired mouse if you're chasing a record. Display latency, wireless polling and browser frame timing can each add several milliseconds.
Frequently asked questions
What is a good reaction time?
Under 250ms is around average, under 200ms is quick, and consistently under 180ms is genuinely fast. Elite esports players often sit in the 150–180ms range.
Why is my score different on different devices?
Screen refresh rate and input lag matter a lot. A 60Hz laptop screen can add 8–16ms compared with a 144Hz monitor, and touchscreens are usually slower than a mouse.
Does reaction time get worse with age?
It typically peaks in the early twenties and declines slowly after that, but training, sleep and caffeine all move the number more than a few years of age do.
Why does it restart when I click early?
A click before the green signal is a false start — you guessed instead of reacting, so the round does not count.