What CMS Is This Site

See in one click: what CMS is this site built on? Plus the site builder, WordPress theme and plugins, shop platform and framework.

What CMS is this site built on? Click the icon on any open page and see the answer in about a second: the CMS or site builder, the WordPress theme and plugins, the shop platform and the JavaScript framework. What CMS Is This Site is a small what cms checker and cms detector for people who look at a lot of websites: SEO specialists, web agencies, freelancers and sales teams. It puts the answer on one short card, right next to the page. 🔍 What it shows on the card: ▸ CMS or site builder: WordPress, Joomla and many more ▸ WordPress theme: the child theme and its parent, by name ▸ WordPress plugins with readable names instead of folder slugs, for example WooCommerce, Elementor or Contact Form 7 ▸ Shop platform: WooCommerce, Shopify and other stores ▸ Framework: React, Next.js and others ▸ Also found: CDN, tag managers, chat and review widgets How it works: 1️⃣ Open any website, even a tab that was open before you installed the extension. 2️⃣ Click the What CMS Is This Site icon in the toolbar to detect CMS, theme and plugins. 3️⃣ Read the card, or press Copy to paste the result into a note for a client. ✅ Every answer comes with a label. Confident means the page shows clear signs of the engine. Likely means fewer signs, so take a second look before you rely on it. The header shows how many signals were found. Think of it as a quick first look at the live page, not a full audit. Ever opened a page and asked yourself: what is this website built with? Many lookup services answer from a database collected months ago, so a site that moved from WordPress to Webflow can still show the old engine. This what cms detector reads the page that is open right now. And unlike a cms checker website, there is no address to copy and paste. 🛡️ What it can't see: • Hosting, DNS and server details the site hides • Versions the site removed from its code • HttpOnly cookies and server-side tools that leave no trace in the HTML • Pages behind a login or a challenge page When no known CMS is found, the extension says so plainly and lists what it did find, such as a framework or a CDN. A custom-built site gets an honest answer instead of a guess. 🔒 Privacy, in short: - The extension reads the page only after you click its icon. It has no access to all your sites. - The result lives in the popup and disappears when you close it. No history, no account, no analytics. - Nothing goes to our servers. The only network request is a HEAD request for the page you already have open, sent to that same site without cookies, to read its response headers. Who it is for: 📌 SEO specialists who need to detect CMS platforms on new client sites 📌 Web agencies planning a redesign or a migration 📌 Sales teams who need a quick tech stack checker to qualify leads 📌 Site owners who inherited a website and want to know what it runs on Questions and answers ❓ What CMS does this site use, and how do I check? Open the site, click the icon and read the card. That's all. ❓ What theme is this site using? On WordPress the extension works as a WordPress theme detector: it names the active theme and its parent, if there is one. It is also a WordPress plugin detector for plugins that load files on the page. ❓ Can it find a Shopify theme? Yes. As a Shopify theme detector it shows the theme name and its version when the store exposes them. ❓ What CMS is this website running if the card says No known CMS found? The site may be custom-built or hide its engine. Check the Found anyway block for the framework and CDN. ❓ Is it a full tech stack checker? It focuses on the CMS, theme, plugins, shop and framework, plus common services. It does not list every library on the page. ❓ Does it work on Chrome pages and PDFs? No. Chrome does not let extensions read its own pages, the Web Store or PDF files. Open a regular website and click again. ❓ Can I check a list of domains? Not in this version. One click checks the page in the current tab. WordPress, Shopify and other names are trademarks of their owners. This extension is not affiliated with or endorsed by any of them.