Embed a reflex test on your site
Any of the fourteen tests below will run inside your own page. Pick one, copy the snippet, paste it where you want the test to appear. There is no sign-up, no API key, no script to install and nothing to configure — it is an <iframe> and a link, and it works on any page you can put raw HTML into.
1. Pick a test
2. Preview it, then copy the code
The width and height are ordinary iframe attributes — change them to fit your layout. The widget is responsive down to about 300 px wide; below roughly 480 px of height the result screen will scroll.
Why the snippet has a link in it as well as the iframe
An iframe credits nobody. Search engines treat the framed page as a separate document, so it passes no link to us, and nothing about your page ever tells them it features our test. The one-line link underneath the iframe is what does that, and it is the entire price of the widget: keep it, and you can use these tests on a commercial, ad-supported site for as long as you like without paying us or asking permission.
If you would rather write your own sentence around the link than use ours, do — "we used the reaction time test at GGReflex" is worth more to both of us than a bare credit line, because it tells a reader why they should click it. What we ask is that the link stays a plain link: not rel="nofollow", not a redirect, not JavaScript.
What it does and does not do to your page
The widget is a cross-origin iframe, so it cannot read your page, your cookies or your visitors' data, and it sets nothing on your domain. What it does do, inside its own frame, is load GGReflex's analytics — the same ones our own site loads — and offer the player the option to submit their score to our global leaderboard. If that is more than your privacy policy allows, do not embed it; we would rather you didn't than that you got in trouble for it.
It weighs about 12 KB of HTML plus the shared scripts, loads lazily by default, and runs entirely in the browser. There is no server call at all until a score is submitted.
Where this works
Anywhere you can paste raw HTML: a WordPress Custom HTML block, a Ghost HTML card, a Notion /embed, a Webflow embed element, a static site, a school VLE page. Editors that strip iframes will silently drop it — that includes most comment fields, some free-plan site builders, and Medium. That is their restriction, not ours, and there is no version of this that gets around it.
Frequently asked questions
Is it really free?
Yes, including on commercial and ad-supported sites. No sign-up, no API key, no rate limit, no paid tier. Keep the credit link and we are square.
Will it work on WordPress, Ghost, Notion or Squarespace?
Anywhere raw HTML or an iframe is allowed. Editors that strip iframes — most comment fields, some free plans, Medium — will not work.
Do you track my visitors?
Inside the frame, the widget loads GGReflex's own analytics and can submit scores to our leaderboard. It sets no cookies on your domain and cannot read your page. If that does not fit your privacy policy, don't embed it.
Can I change the size?
Yes — width and height are just iframe attributes. Responsive down to about 300 px wide; give it 480 px of height or the result screen will scroll.
Can I remove the credit link?
Please don't. It is the only thing we get out of this, and it costs you one line. If a link is genuinely impossible on your platform, tell us what you're building and we'll almost certainly say yes anyway.