Free & No Signup, 170+ Technologies

What Is This Website Built With?

Tech Stack Detector: paste any URL and see the frameworks, CMS, hosting, analytics and fonts behind it.

How It Works

Our scanner fetches the target website's HTML and HTTP headers, then pattern-matches against 170+ technology signatures to identify frameworks, CMS platforms, analytics tools, and more.

What We Detect

  • CMS platforms (WordPress, Shopify, Wix, Webflow, Drupal)
  • Frontend frameworks (React, Vue, Angular, Svelte, Next.js)
  • CSS frameworks (Tailwind CSS, Bootstrap, Bulma)
  • JavaScript libraries (jQuery, GSAP, Three.js, D3.js)
  • Analytics & tracking (Google Analytics, Hotjar, Mixpanel)
  • Web servers (Nginx, Apache, LiteSpeed, Caddy)
  • CDN/Hosting (Cloudflare, Vercel, Netlify, AWS)
  • Advertising networks (AdSense, Taboola, Outbrain)
  • Cookie consent tools (CookieBot, OneTrust)
  • Email infrastructure (Google Workspace, Microsoft 365, SendGrid)
  • Security headers, SSL certificates & DNS records
  • WordPress plugins (Yoast SEO, Elementor, WooCommerce)

Detection Limitations

  • Backend languages (Ruby, Python, Go, Java), only visible if leaked via headers
  • SSR frameworks (React, Vue with SSR), markers stripped in production builds
  • Databases (MySQL, PostgreSQL, MongoDB), never exposed to frontend
  • Internal tools (Docker, Kubernetes, CI/CD), server-side only
  • Sites behind WAF, Cloudflare/Akamai may block scanning

This tool scans HTML source, HTTP headers, cookies, and DNS records. Unlike browser extensions (Wappalyzer), it cannot execute JavaScript or access server internals.

How to Check What a Website Is Built With

There are three practical ways to find the framework, CMS and hosting behind a site. They differ in speed, in depth, and in how much you need to know before you start.

1. Run a tech stack lookup

Paste the URL into the scanner above. It requests the page server side, reads the HTML, HTTP headers, cookies and DNS records, then matches what it finds against 170+ known signatures.

This is the fastest route and it needs nothing installed. Use it when you want the full picture in one pass, including hosting, CDN, analytics, fonts and security headers, rather than just the framework name.

2. Read the page source

Right click the page, choose View Source, then search for telltale strings. wp-content means WordPress. cdn.shopify.com means Shopify. _next/static means Next.js. __NUXT__ means Nuxt. A generator meta tag often names the CMS outright.

Free and reliable, but you only find what you already know to look for, and modern build tools strip most of the obvious markers before deploy.

3. Open browser developer tools

Press F12, open the Network tab and reload. The response headers on the document request often name the server and the CDN, and sometimes leak the backend through X-Powered-By. The Sources panel shows bundled framework files that never appear in the raw HTML.

This is the deepest method, and the only one that sees what JavaScript loads after the page renders. That is why a browser extension occasionally spots something a server side scanner cannot.

Frequently Asked Questions

What is a tech stack detector?

A tech stack detector analyzes any website URL and identifies the technologies it uses, including frontend frameworks (React, Vue, Angular), CMS platforms (WordPress, Shopify), hosting providers (Cloudflare, Vercel), analytics tools, and more.

How does this tool detect website technologies?

It fetches the website's HTML source code and HTTP response headers via server-side request, then pattern-matches against a database of 170+ technology signatures. It checks HTML patterns, script URLs, meta tags, HTTP headers, cookies, CSS patterns, and DNS records.

Is this tool free to use?

Yes, Tech Stack Detector is completely free with no signup required. You can scan unlimited websites and export results as JSON.

How is this different from BuiltWith or Wappalyzer?

Unlike BuiltWith (paid for detailed reports) and Wappalyzer (requires browser extension), this is a free web-based tool that works instantly. It also provides performance analysis, security headers, DNS records, SSL certificates, and SEO meta tags in one scan.

Can it detect backend technologies?

Backend technologies (like Python, Ruby, Java) are only detectable when the server leaks information via HTTP headers (e.g., X-Powered-By). Databases and internal infrastructure are never exposed to the frontend and cannot be detected by any passive scanner.

How do I find out what framework a website uses?

Run the URL through the scanner and open the Technologies tab. Frontend frameworks leave marks in bundle paths and runtime globals, so React, Vue, Angular, Svelte, Next.js and Nuxt are usually identified with high confidence. If the site was pre-rendered and the markers were stripped at build time, the scanner reports the hosting and CDN instead, which still narrows the field.

How can I tell if a website is built on WordPress?

The clearest signal is wp-content or wp-includes in asset URLs. WordPress also emits a generator meta tag unless the theme removes it, and it sets recognisable cookies once a user logs in. The scanner checks all three, and where the evidence is there it also names visible plugins such as Yoast SEO, Elementor and WooCommerce.

Can I check the tech stack of any website?

Any publicly reachable page, yes. Pages behind a login, an IP allowlist or an aggressive firewall may refuse the request or return a challenge page instead of real HTML, and the results will be thin or empty when that happens.

Why does a browser extension sometimes find more than this scanner?

An extension runs inside a real browser, so it sees scripts that load and execute after the initial HTML arrives. This scanner reads the server response only. That makes it faster and usable on any device, but a technology injected purely at runtime can slip past it.

How accurate is website technology detection?

Detection is inference from public evidence, not a readout of the server. Anything that leaves a fingerprint in HTML, headers, cookies or DNS is usually correct. Anything behind the server boundary, such as the database, the backend language or the deployment pipeline, cannot be seen by any passive tool that claims otherwise.

Is it legal to check what technology a website uses?

Yes. The scanner reads only what a site publishes to every visitor, which is the same information a browser receives when the page opens. It does not attempt to log in, probe for vulnerabilities, or reach anything that is not public.