About ReactScore

Why this exists

I started building ReactScore for a simple reason: I wanted to know my real reaction time, and I could not find a test I trusted. Reflexes have always fascinated me, so I took every online reaction test I could find, and they all gave me different numbers. None of them explained why. None of them admitted that the screen in front of me was adding lag that had nothing to do with my reflexes.

The deeper I dug into the research, the more obvious the gap became. The science of reaction time is genuinely well studied (there are big public datasets and decades of papers), but almost none of it had made it into the tools people actually use. So the tools felt like toys, and the science sat in journals. ReactScore is my attempt to put them in the same place: a test that is fun to beat your own score on, built on numbers you can actually trust.

What makes it different

• It is honest about device lag. Every web test adds 10–50 ms of monitor and input latency. We measure your display, show your raw time and a corrected time, and tell you the margin instead of hiding it.
• It scores you fairly. Five attempts, median not mean, with anticipation guesses thrown out. One distracted click does not wreck your result.
• It puts you in context. A bare millisecond number means nothing on its own, so we show your percentile, how you compare by age, and a just-for-fun reflex age.
• It is free and private. No account, no paywall. Your scores live in your own browser, not on our servers.

Who makes it

Lokesh Rathore is the founder of ReactScore and the person behind everything on it. Reflexes and reaction time are a genuine fascination of his, so he built the test he wanted to use himself: one that measures honestly, corrects for the lag your screen and mouse add, and explains the numbers instead of hiding them. He keeps every figure on the site grounded in public datasets and published research. You can read exactly how the measurements work on the methodology page, and if you spot something wrong (a number, a claim, a bug), I genuinely want to hear it. Get in touch.

How we keep this accurate

The numbers on this site are not made up. Every reference figure (the average reaction time, the age and gender curves, the records) is checked against named, public sources: peer-reviewed studies, large public datasets and sport governing bodies, all linked in a Sources section at the foot of each article and on the data page. When the research only supports a range or a rough figure, we say so rather than inventing precision. If you find a claim you think is wrong, tell us and we will fix it or cite it. Corrections go in with the date changed.

ReactScore is an independent project at reactscore.com. It is for curiosity and training; it is not a medical or diagnostic tool.