Is embedding the reaction time test free?

Yes. The reaction time test is free to embed on any site, with no account, no API key and no usage limits. It runs entirely in your visitor’s own browser, so there is no server cost — we only ask that you keep the small "Reaction Time Test by LK Forge" credit line that comes with the embed code.

How does the test measure reaction time?

It measures the milliseconds between the moment the pad turns green and the moment the visitor clicks or presses a key, using the browser’s high-resolution timer. A random 1.5 to 4.5 second wait before each round stops anyone from anticipating the signal, clicking too early counts as a false start, and the final score is the average of five rounds.

Does it work on phones and tablets?

Yes. On a touchscreen visitors tap the pad instead of clicking, and it works with a mouse, a trackpad or the spacebar on desktop. The widget scales to the width you give the iframe, and each visitor’s best time is saved locally on their own device.

Where can I embed it — WordPress, Wix, Squarespace, Notion?

Anywhere you can add HTML, because it is a standard iframe. In WordPress use a Custom HTML block; in Squarespace a Code/Embed block; in Wix an Embed HTML element; in Ghost an HTML card; in Notion paste the /embed/reaction-time-test/ URL as an embed. On a plain HTML page or an intranet, paste the snippet straight into the markup.

Does the embedded test track visitors or set cookies?

No. Everything runs locally in the visitor’s browser — no clicks or times are sent to a server. The embed sets no tracking cookies and sends no analytics, so it is safe to place on a privacy-sensitive site, an intranet, or a page for children.

Widgets

How to Add a Reaction Time Test to Your Website

LK Forge · 4 min read · Updated September 2026

You can add a free reaction time test to any website, blog, or classroom page with a single line of code — no sign-up, no plugin, and no script to install. Visitors wait for the pad to turn green, click as fast as they can, and get their reflex time in milliseconds over five rounds. This guide covers the fastest way to embed the Reaction Time Test and where it works.

The quickest way: paste one embed snippet

An embed is just an <iframe> that loads the test from lkforge.com, plus a small credit line. Copy this into your page’s HTML where you want the test to appear:

<iframe src="https://lkforge.com/embed/reaction-time-test/"
        width="100%" height="560" loading="lazy"
        style="border:0;max-width:560px"
        title="Reaction Time Test by LK Forge"></iframe>
<p><a href="https://lkforge.com/tools/reaction-time-test/">Reaction Time Test</a>
   by <a href="https://lkforge.com/">LK Forge</a></p>

The <iframe> is the live test; the <p> underneath is a plain credit link. Keep that line — the visible link is what keeps the widget free to embed. You can also copy this exact code straight from the “Add This Reaction Time Test to Your Website” section on the tool page.

Why embed a reaction test

A reaction time test is a quick, sticky bit of interactivity that visitors want to retry and share a score from. It fits naturally on:

Gaming and esports blogs — reflexes are the thing readers most want to measure and compare.
Psychology and biology lessons — a live demo of simple reaction time, the effect of the random wait, and why averaging rounds matters.
Fun and quiz pages — a self-contained mini-game that keeps people on the page a little longer.

Because each visitor’s best time is saved on their own device, there is always a score to beat on the next visit.

Where it works

Because it is a standard iframe, the embed works anywhere you can add HTML:

WordPress: add a Custom HTML block and paste the snippet.
Squarespace: use a Code / Embed block.
Wix: add an Embed HTML / iframe element.
Ghost: insert an HTML card.
Notion: paste the /embed/reaction-time-test/ URL and choose "Create embed".
Plain HTML, an intranet, or a lesson page: paste the snippet straight into the markup.

That’s the whole job. Copy the embed code from the Reaction Time Test page and paste it wherever a gaming blog, a lesson, or a fun page needs an instant reflex test.

Grab the embed code from the 'Add This Reaction Time Test to Your Website' section on the tool page — free, no sign-up.

Open the Reaction Time Test

Frequently asked questions

Is embedding the reaction time test free?: Yes. The reaction time test is free to embed on any site, with no account, no API key and no usage limits. It runs entirely in your visitor’s own browser, so there is no server cost — we only ask that you keep the small "Reaction Time Test by LK Forge" credit line that comes with the embed code.
How does the test measure reaction time?: It measures the milliseconds between the moment the pad turns green and the moment the visitor clicks or presses a key, using the browser’s high-resolution timer. A random 1.5 to 4.5 second wait before each round stops anyone from anticipating the signal, clicking too early counts as a false start, and the final score is the average of five rounds.
Does it work on phones and tablets?: Yes. On a touchscreen visitors tap the pad instead of clicking, and it works with a mouse, a trackpad or the spacebar on desktop. The widget scales to the width you give the iframe, and each visitor’s best time is saved locally on their own device.
Where can I embed it — WordPress, Wix, Squarespace, Notion?: Anywhere you can add HTML, because it is a standard iframe. In WordPress use a Custom HTML block; in Squarespace a Code/Embed block; in Wix an Embed HTML element; in Ghost an HTML card; in Notion paste the /embed/reaction-time-test/ URL as an embed. On a plain HTML page or an intranet, paste the snippet straight into the markup.
Does the embedded test track visitors or set cookies?: No. Everything runs locally in the visitor’s browser — no clicks or times are sent to a server. The embed sets no tracking cookies and sends no analytics, so it is safe to place on a privacy-sensitive site, an intranet, or a page for children.