CMS Detector: What Is This Site Built With?

Paste a website address to see what it’s built with: WordPress, Shopify, Wix, Squarespace, Webflow, Framer, Carrd, Ghost, Joomla, Drupal and 17 other platforms, from GoHighLevel and Lovable to Next.js. For WordPress sites you also get the theme and the plugins that load on the page. Free, no signup.

• Detects 27 platforms: 22 CMSs and website builders, 5 site frameworks (Next.js, Nuxt, Astro, Hugo, Gatsby), and it says so when a site is a plain React app with no CMS. The table below says how each one was checked.
• Goes deeper on WordPress: theme, parent theme and plugins.
• Names the host when the server, the DNS or the IP address gives it away, and says so when Cloudflare hides it. For hosting only, use the hosting detector.
• Says “no known platform” rather than guessing when it finds no marks.

What gives each platform away

Every platform leaves marks in the pages it produces: where it stores files, the scripts it adds, a “generator” tag. The detector looks for these marks. The first 10 platforms in the table, WordPress to Joomla, were checked against live sites built with that platform on 27 September 2026. The rest use each platform’s known marks. GoHighLevel to Nuxt were added in October 2026 after we looked at 206 sites the detector couldn’t name in one week; each was checked on sites from that list.

Platform	What the detector looks for
WordPress	Files under /wp-content/themes/, /wp-content/plugins/ or /wp-includes/, the api.w.org link, a “WordPress” generator tag
Shopify	Files from cdn.shopify.com, the Shopify.theme script
Wix	Images from static.wixstatic.com, the “Wix.com Website Builder” generator tag
Squarespace	The Static.SQUARESPACE_CONTEXT script, files from static1.squarespace.com
Webflow	The data-wf-site and data-wf-page attributes on the page
Framer	Files from framerusercontent.com, the “Framer” generator tag
Carrd	Carrd’s page script together with its -component instance- class names
Ghost	The “Ghost” generator tag, Ghost’s content API
HubSpot CMS	The “HubSpot” generator tag, files from hubspotusercontent
Joomla	The “Joomla!” generator tag, /media/system/js/ files
Drupal	Files under /sites/default/files/, a “Drupal” generator tag
GoDaddy Website Builder	Files from img1.wsimg.com
Weebly	Files from editmysite.com
Duda	Files from multiscreensite.com
Next.js, Astro, Hugo, Gatsby	Their build markers (__NEXT_DATA__, /_next/static/) or generator tags
GoHighLevel	Files from leadconnectorhq.com and filesafe.space
Lovable	Images or scripts from .lovable.app, the lovable-tagger build mark
Canva	The __canva_website_bootstrap__ script
Readymag	A “Readymag” generator tag, files from readymag.com
Cargo	Files and links from cargo.site
Jimdo	A “Jimdo” generator tag, files from jimstatic.com
Kajabi	Files from kajabi-cdn.com
Systeme.io	The “Created with systeme.io” comment
Nuxt	The window.__NUXT__ data, files under /_nuxt/
React app, no CMS	An empty <div id="root"> and one bundle under /assets/index-: the shell that hand-written React apps and AI app builders ship

A page can carry marks from two platforms, for example a WordPress site with a Shopify buy button. The detector names the one with the strongest marks and lists the others as traces.

How to tell what CMS a site uses without a tool

You can do by hand what the detector does.

1. Open the page source. Press Ctrl+U on Windows or Linux, Cmd+Option+U on a Mac.
2. Search the source (Ctrl+F or Cmd+F) for the marks in the table above. Start with these: wp-content for WordPress (the word after /themes/ is the theme’s folder name), cdn.shopify.com for Shopify, wixstatic for Wix, squarespace for Squarespace, data-wf-site for Webflow, framerusercontent for Framer. Then try generator: Ghost, Joomla, Drupal and HubSpot name themselves in that tag.
3. Check a second page if the homepage shows nothing. A site can use one platform for the main site and another for the blog or the shop.

CMS, framework or host: three different answers

“What is this site built with?” can mean three things, and a site can have all three.

Layer	Examples	What it tells you
CMS or website builder	WordPress, Shopify, Wix, Webflow	Where the content is edited, and usually what controls the design
Framework	Next.js, Astro, Hugo, Gatsby	How the pages are built, not where the content comes from
Host or CDN	Kinsta, Vercel, Cloudflare	Who delivers the site, not what it’s built with

A site can run Next.js on Vercel and pull its content from WordPress behind the scenes (“headless” WordPress). The public pages then carry Next.js marks, not WordPress ones, and the detector reports Next.js.

Hosting and CDN hints

Every result also names the host when it can, from three clues: the server’s response headers (x-kinsta-cache means Kinsta, x-vercel-id means Vercel), where the domain points in DNS (wpenginepowered.com means WP Engine), and who owns the server’s IP address (Hostinger, DigitalOcean, OVHcloud). A CDN such as Cloudflare in front of a site hides the host behind it, and the result says so rather than guessing. The hosting detector explains each clue.

When the answer is “no known platform”

• The site is custom-built or uses a framework that leaves no marks.
• The page is built by JavaScript after it loads, so the first response is nearly empty.
• The site uses a headless CMS: the content lives in one system and the pages are built by another.
• The site shows a security check to automated visitors. The detector tells you when that happens.

What people check with this detector

How this detector compares

Other detectors cover more technologies; this one shows its evidence and goes deeper on WordPress. The lines below come from each tool’s own site, read on 10 October 2026.

Tool	What its site says
PressWork CMS Detector	27 platforms, with the marks it found. WordPress theme, plugins and the host in the same result. Free, no signup.
WhatCMS	“Currently detecting 1540 website powering technologies”. WordPress themes and hosting are on separate sites it links to (ThemeDetect.com, Who-Hosts-This.com).
Wappalyzer	A full technology lookup. A free account gives “50 technology lookups every month”; the browser extension is listed under its paid Plus features.
Gochyu	A CMS detector plus separate theme detectors for WordPress, Shopify, Joomla, Drupal and Squarespace.

If two detectors disagree, check the page source by hand, as described above.

For WordPress sites, the theme detector and the plugin detector go further.

Questions