Reaction Time Test
Click the box, wait for it to turn green, then click again as fast as you can. Five rounds, timed to the millisecond.
What this actually tests
This measures the time between a visual change (the box turning green) and your click reaching the browser — a rough proxy for simple visual reaction time. Typical human reaction time to a visual stimulus is around 200-250ms; competitive gamers often land in the 150-200ms range. Display lag, input lag from a wireless mouse, and browser performance all add a small amount of overhead on top of your actual reflexes, so treat this as a consistent comparison tool rather than a lab-grade measurement.
Getting a fair reading
- Rest your hand on the mouse before starting — the first round often measures "getting ready," not reflexes.
- Run it a few times; reaction time naturally varies round to round.
- A wired mouse and a wired or low-latency display will read faster than a laggy wireless setup, independent of your actual reflexes.
FAQ
What's an average human reaction time?
Around 200-250 milliseconds to a simple visual stimulus like a color change. Trained competitive gamers often average 150-200ms, and going below roughly 150ms consistently usually means you anticipated the change rather than reacted to it.
Why does my score vary so much between rounds?
Reaction time naturally fluctuates with attention and fatigue even within the same test — a single round can swing 30-50ms from your average just by chance. That's why this tool runs five rounds and reports an average and best time rather than a single number.
Does a gaming mouse actually improve reaction time?
A low-latency wired mouse and a high refresh-rate display remove a few milliseconds of input and display lag compared to a laggy wireless setup, but that overhead is small next to natural human variation. It shifts your measured score slightly; it doesn't change your actual reflexes.