Which membership tool is that site using?
Paste a URL. We read the page's HTML for the traces membership and login tools leave behind, and show you the exact snippet behind every match.
The short answer
Which membership tool does that site use?
Most membership and login tools leave traces in a page's HTML: their script, their configuration, the data attributes they read, or links to their hosted checkout. The detector fetches the page once, logged out, without running its scripts, and looks for those of Memberstack, Memberful, MemberSpace, Outseta, MemberPress, Ghost, Clerk, Auth0 and Supabase. A tool added through a tag manager, or used only behind a login, won't show up.
Questions about the detector
What it reads, what it can't see from outside, and how to read a result.
It fetches the page you enter once, the way a logged-out visitor's browser would, and reads the HTML that comes back. It looks for the specific traces each membership or login tool's install code leaves there: the tool's own script, its configuration, the data attributes it reads, or links to its hosted checkout and account pages. Each match is shown with the exact snippet it came from, so you can check the evidence yourself.
Memberstack, Memberful, MemberSpace, Outseta, MemberPress, Ghost, Clerk, Auth0 and Supabase. A tool is only on the list if its public install instructions or source code show a trace that appears in a page's HTML and can't be confused with a page that simply mentions it.
High means the tool's own script or its setup code is on the page, which is hard to have by accident. Medium means its markup is there, such as its data attributes or links to its checkout, but not its script. That usually means the script is added another way, or was removed and the markup left behind. Low is a hint that fits the tool but proves little on its own, like a page built with Ghost that isn't loading Ghost's members script.
No. It reads the HTML as text and never runs any of the page's scripts. That keeps it safe to point at any site, and it's also why anything added to the page after it loads is out of view.
Only what's in the page's HTML is visible. A tool added through Google Tag Manager or another script loader, bundled into a site's own JavaScript, or used only on pages behind a login won't show up. Neither will authentication that happens entirely on the server. Nothing found doesn't mean nothing is used. Try the page where people sign up or log in, which is where these tools are most often loaded.
No, only the one page you enter, after following up to five redirects. Some sites only load their membership tool on certain pages, so if the homepage comes back empty, try the pricing, sign-up or login page.
No. The page is fetched, read for traces of membership tools and thrown away. Only the result is sent back to your browser: the tools found and the short snippets that show why.
Yes. The detector reads the same public HTML anyone sees with their browser's view source, from one request per check. It doesn't log in, submit forms or crawl the site.
Sites often use one tool for logins and another for something else, or still carry markup from a tool they moved away from. Each result lists its own evidence, so you can see which one is actually loaded and which is leftover markup.
More free tools.
No signup, no catch. Each one answers a question builders keep asking about their membership.
Sitemap Leak Checker
Can search engines find your members-only pages?
Your sitemap and robots.txt tell Google where to look. We check which members-only pages they list, which ones only robots.txt is hiding, and which have no noindex.
- Free
- No signup
- Checks up to 25 pages
Attribute Generator
Which data attributes do I need for this?
A signup form is four attributes across three elements, and that's the simple one. Pick what you're building and get them as a checklist, on the right elements, in the order you'd select them in Webflow.
- Free
- No signup
- Runs in your browser
Content Flash Checker
Does your gated content flash before it's hidden?
On a slow connection, members-only content can show for a moment before Memberstack hides it. We load your page on a throttled browser and show you exactly what appeared, and for how long.
- Free
- No signup
- Real browser, slow 4G