--- title: "What CMS is this site? Free CMS and technology checker | PostCliq" description: "Find out what CMS or platform any website is built on: WordPress, Shopify, Webflow, Wix, Squarespace, Next.js and 90 more. Every answer shows the evidence from the page source." url: "https://postcliq.com/free-tools/what-cms-is-this-site" --- [Free tools](https://postcliq.com/free-tools) · Instant check # What is this site built with? The CMS, with the proof. Type any website. We read its homepage the way a browser receives it and tell you the CMS or platform, the framework, plugins and tools, and what each one means for speed, security and AI visibility. Free No sign-up Answer in seconds Reads one public page and its response headers. Nothing is stored and nothing is sent to the site except an ordinary page request. The free plan ## One check is a clue. The free plan is the whole picture. - A full audit of up to 50 pages, every week - The three fixes that win the most enquiries, with the evidence - Speed, security, AI visibility, tracking and the enquiry path in one report - Connect Google Analytics, Search Console and Clarity to see what visitors really do - One website free, or five client sites for an agency. No card. **Free** No card. No trial that runs out. [Create your free account](https://postcliq.com/login?mode=signup) [Already have an account? Log in](https://postcliq.com/login) ## Questions people ask How do you know which CMS a site uses? Every platform leaves fingerprints: a generator tag, folder names such as /wp-content/, a response header only that platform sends, or a cookie name. We only say "confirmed" when the platform names itself or two independent signals agree, and we show you each signal so you can check it in the page source. Why does the CMS matter? It decides what can be fixed and by whom. A WordPress site needs plugin and core updates; a Wix or Squarespace site cannot change its server settings; a JavaScript app can be invisible to AI crawlers. Knowing the platform tells you which fixes are a settings change and which are a developer job. What if it says nothing was found? Some sites are custom builds or hide their fingerprints deliberately. We would rather say we could not tell than guess. ## More instant checks [**Where is this site hosted?** Find the host, the CDN and who runs the DNS and email. Run it free](https://postcliq.com/free-tools/where-is-this-site-hosted) [**Grade my website security** Get a security grade for headers, SSL and email spoofing. Run it free](https://postcliq.com/free-tools/website-security-grade) [**Can AI see your page?** See what ChatGPT and Claude actually read on your page. Run it free](https://postcliq.com/free-tools/can-ai-see-your-page) [**Which AI crawlers can read my site?** See which of 20 AI bots your site lets in. Run it free](https://postcliq.com/free-tools/ai-crawler-access-checker) [**Can an AI agent read my site?** Score how ready your site is for AI agents, out of 100. Run it free](https://postcliq.com/free-tools/can-ai-agents-read-my-site) [**Is my website slow?** Find the nine things that most often slow a page down. Run it free](https://postcliq.com/free-tools/website-speed-test) [**Can visitors contact you?** Check the path from visit to enquiry, step by step. Run it free](https://postcliq.com/free-tools/can-visitors-contact-you) [**Is my tracking installed?** See which analytics and ad tags are on the page. Run it free](https://postcliq.com/free-tools/is-my-tracking-installed) [**How does my page look in Google?** See your Google result and LinkedIn card before others do. Run it free](https://postcliq.com/free-tools/google-and-social-preview) [**Check my structured data** Find broken structured data and what Google can’t read. Run it free](https://postcliq.com/free-tools/schema-markup-checker) [**Do my redirects work?** Check every version of your address lands in one place. Run it free](https://postcliq.com/free-tools/redirect-checker) ## Stop guessing. See what stops visitors enquiring. Create your free PostCliq account and get your full website audit in minutes. [Sign up free](https://postcliq.com/login?mode=signup) [Log in](https://postcliq.com/login)