Site Detective

Free Website Technology Detector — Find Out What Any Site Is Built With

Ever visited a website and wondered "what is this built with?" Our free Site Detective tool answers that question in seconds. Just paste any URL and the tool scans the page's HTML source, meta tags, scripts, stylesheets, and response headers to identify the CMS, JavaScript frameworks, CSS libraries, analytics tools, hosting provider, payment processors, and dozens of other technologies powering the site. It's like having Wappalyzer or BuiltWith right inside your browser — no extension installs, no accounts, completely free.

Why Knowing a Site's Tech Stack Matters

Understanding what technologies a website uses isn't just curiosity — it's a strategic advantage for developers, marketers, agencies, and business owners. Competitive analysis starts with knowing what your competitors are running. If a rival site loads faster, ranks higher, or converts better, knowing their tech stack tells you what tools and frameworks are driving those results. For agencies pitching new clients, running a quick tech audit shows immediate expertise and uncovers opportunities.

• •Competitive intelligence — see what frameworks, CMS platforms, and analytics your competitors use
• •Sales prospecting — identify Shopify stores, WordPress sites, or custom-built apps to tailor your pitch
• •Developer research — discover which JavaScript framework or CSS library a site you admire uses
• •SEO auditing — check if a site has analytics, structured data, Open Graph tags, and HTTPS in one scan
• •Migration planning — document the full tech stack before proposing a platform migration
• •Security awareness — spot outdated libraries, missing HTTPS, or exposed technologies that create risk

What the Site Detective Detects

The tool checks for over 80 technology signatures across every major category in the web ecosystem. Each detection is confidence-rated so you know which matches are definitive and which are probable:

• •CMS Platforms — WordPress, Shopify, Wix, Squarespace, Webflow, Joomla, Drupal, Ghost, and more
• •JavaScript Frameworks — React, Next.js, Vue, Nuxt, Angular, Svelte, SvelteKit, Astro, Remix, Ember
• •CSS Frameworks — Tailwind CSS, Bootstrap, Bulma, Foundation, Material UI, Chakra UI, Ant Design
• •Analytics & Marketing — Google Analytics, GTM, Meta Pixel, Hotjar, Mixpanel, Plausible, Segment
• •Hosting & CDN — Vercel, Netlify, Cloudflare, AWS CloudFront, Google Cloud, Firebase
• •E-commerce — WooCommerce, Magento, BigCommerce, Stripe, PayPal integrations
• •SEO & Social — Yoast, Rank Math, Open Graph, Twitter Cards, Schema.org JSON-LD structured data
• •Build Tools & Libraries — Webpack, Vite, jQuery, GSAP, Three.js, Alpine.js, HTMX, Framer Motion

Built-In SEO & Metadata Audit

Beyond technology detection, the Site Detective also performs a quick SEO health check on every scanned URL. It extracts the page title, meta description, language attribute, viewport tag, Open Graph images, favicon, and structured data presence — giving you an instant snapshot of a site's on-page SEO fundamentals. The audit flags missing elements with clear warnings so you can spot issues at a glance. For freelancers and agencies, this makes client discovery calls more productive — run a scan before the meeting and walk in with specific, actionable recommendations.

How It Works — Fast, Private, No Extensions

Enter a URL, hit Analyze, and the tool fetches the page's HTML through a secure proxy, then runs it against a comprehensive database of technology signatures — matching patterns in script tags, stylesheet links, meta generators, HTML class names, inline scripts, and response headers. The entire analysis happens in your browser. No browser extensions to install, no accounts to create, no data stored. Results appear in seconds with technologies grouped by category, confidence levels displayed, and a full metadata breakdown included. It's the fastest way to reverse-engineer any website's tech stack without leaving your current tab.