I Made a Free Embeddable Reaction Time Test — No Ads, No Signup

#webdev #javascript #sideprojects #gaming

I run a reaction time benchmark tool and just packaged it as a free embeddable widget.

How it works

Random delay (1-4 seconds), click timing with performance.now() for millisecond accuracy. Tracks your last score, average, and personal best. Color-coded dot history — green under 200ms, yellow under 300ms, red 300ms+.

Embed in one line

<iframe src="https://checkreactiongame.com/widget-embed.html"
  width="360" height="280" frameborder="0"
  title="Reaction Time Test">
</iframe>

Dark theme, pure HTML/CSS/JS, zero dependencies. No API key, no tracking, no ads.

Why I built this

Every "free reaction test" site I found was either buried in ads or required signup to see your history. I wanted something clean that site owners could drop into a blog post or fitness page without sending their visitors to an ad farm.

Try it: checkreactiongame.com/widget-embed.html

Source: github.com/dayu2333-jinyul/reaction-time-data