See what's behind any paywall.
Paste a membership site. We'll show you the platform, payments, login flow and pricing it runs on, and how you'd build the same thing on Memberstack.
Tip: a pricing or login page shows more than a homepage.
The short answer
How can you tell which membership platform a site uses?
Look at the page a logged-out visitor gets. Membership platforms, payment providers and site builders each leave fingerprints in it: the scripts it loads, the attributes on its forms and buttons, its response headers and cookie names. Something only one product leaves behind confirms it; a link or a word only makes it likely.
Every stack leaves fingerprints.
No login, no JavaScript, no AI guessing. Just the page a logged-out visitor gets, matched against what each platform leaves behind.
Scripts
What the page loads
Membership and payment tools load their code from their own servers. Stripe.js from js.stripe.com, Memberful from its embed, Ghost Portal from its CDN.
<script src="https://js.stripe.com/v3">Markup
How forms are wired
Most tools hook into the page with their own attributes and class names. They're as good as a signature, and they show where login, signup and gating live.
data-ms-modal="signup"Headers & cookies
What the server says
Response headers and cookie names give away the platform even when the HTML doesn't. We read the names, never the values.
set-cookie: __client_uat=…Questions about the X-ray
What it reads, what it can't see, and what happens to the results.
It fetches the page you paste the way a logged-out visitor's browser would, with no account, no cookies and no JavaScript, and reads what comes back: the scripts it loads, the attributes on its forms and buttons, its response headers and the names of any cookies it sets. Membership platforms, payment providers and site builders each leave recognisable fingerprints in those, and the X-ray matches them against a list of more than thirty.
Confirmed means we found something only that product leaves behind, like its script loading from its own servers or its own data attributes on the page. Likely means something weaker, like a link to the product or a word it uses. A page that links to Patreon doesn't necessarily run on Patreon, so that shows as likely.
Some sites bundle their membership code into their own scripts, or build the whole page in the browser after it loads, so there's nothing recognisable in the HTML a server sends. Try the site's pricing, login or members page instead of the homepage: those are where membership and payment scripts usually load.
The page you paste, plus the site's pricing page if that page links to one and the site's robots.txt allows it. If the page redirects within the same site, for example from example.com to www.example.com, we follow it once. Every request times out after 8 seconds.
No. It never logs in and never runs the page's JavaScript, so it only sees what any anonymous visitor already gets. It reports which tools a site uses and the public prices on its pricing page, not the content behind the paywall.
Results are cached in memory for up to an hour, so a shared link doesn't fetch the site again every time someone opens it. Nothing is written to a database, and the page's HTML is discarded as soon as it has been read.
Yes, a gentle one: a handful of X-rays a minute per person, and a cap on how often any single site can be fetched in a few minutes. That keeps the tool from being pointed at someone's server over and over.
Usually, yes. Memberstack adds signup, login, paid plans and gated content to a site you design yourself in Webflow, WordPress or custom code. The X-ray's rebuild plan is tailored to what it found: it keeps your builder and your Stripe account where it can, and points you at the migration guide for the platform you're on.
Yes. Members import from a CSV, up to 10,000 rows per file. To import paying members, the plans they're on need to exist in both Memberstack and Stripe first, which Memberstack's Import Stripe Product tool handles.
Like what you see? Build your own.
Memberstack adds signup, login, paid plans and gated content to the Webflow site you already have. No rebuild, no new platform to learn.
More free tools.
No signup, no catch. Each one answers a question builders keep asking about their membership.
Membership Tool Detector
Which membership tool does that site use?
Paste a URL and we read the page's HTML for the traces membership and login tools leave behind. See which tool it runs, how sure we are, and the exact snippet that gave it away.
- Free
- No signup
- Reads one page
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