What is this site built with

What this checks

This tool reads a website the way a developer would on the first day of a rebuild. It starts with the public records behind the address: the domain records, the mail records and the certificate. Then it asks the site for its homepage, once, works out whether the site itself answered or something in front of it did, and reads the markup and the headers when the answer is the site's own. Now and then one further public page is checked, but only to settle a question the homepage left open.

It names the platform where it can: WordPress, Shopify, Wix, Squarespace, Webflow and the common site builders. When a site answers normally and matches nothing it recognises, it says so honestly rather than guessing. When something in front of the site answers instead, it says that instead, and it never confuses the two. On WordPress it goes further and reports the theme, the page builder, the plugin folders it can see, and flags the ones that carry a licence someone has to keep renewing.

Around that it lists the shop software, the analytics and advertising tags, the languages the site is published in, the outside services the pages depend on, and the hosting fingerprints in the records, the certificate and the headers. Every report ends with the same question the email checker answers: whether your email runs on the same hosting as your site, and would go down with it in a move.

None of this is a manifest. It is fingerprints read from public records and public files, so every conclusion is shown with what it rests on and how much weight that carries, worded as a signal rather than a certainty, and it never invents a description for something it does not carry a note about.

Questions people ask

Is this legal to check?

Yes. Everything this tool reads is public: the page your browser already downloads, the headers your server sends with it, and the domain records anyone can look up. It logs in to nothing, changes nothing, and sends no mail.

Can it be wrong?

Yes. It reads fingerprints, not a manifest, so a hidden plugin or a renamed folder can escape it and a leftover file can suggest something that is no longer used. That is why the report says appears to and signals suggest rather than stating things as fact.

Why does the platform matter when rebuilding?

It decides how much of the work can come with you. Content and pages on an open platform can move to any host. On a closed builder the design belongs to the platform, so a move means rebuilding the look from scratch rather than carrying it across.

What does lock-in mean?

Anything that would have to be rebuilt, repurchased or reconnected if you left. A paid theme or page builder licence that has to keep being renewed, a design that only exists inside one platform, or email that runs on the same hosting as the site and would go down with it.

What happens if the site blocks the check?

Some sites show a checking screen to automated visitors, or refuse them outright. The report says so plainly, names the layer that answered where it can, and does not pretend the site is unrecognised. Everything that does not depend on reading the page is still reported: the domain records, the mail provider, the certificate, the fronting service and whether your email is tied to your hosting.

Want to know how well it performs rather than how it is built? Run the website health check.