Scanning website technologies…
⟳ Fetching website HTML
⟳ Analyzing JS frameworks
⟳ Checking HTTP headers
⟳ Running DNS lookup
⟳ Calculating scores
Instantly detect CMS, JavaScript frameworks, CDN, analytics, security headers, DNS records, IP info & 250+ web technologies used by any website — for free.
Our engine scans 250+ web technologies across 22+ categories to give you a complete picture of any website's stack.
Identify WordPress, Shopify, Joomla, Drupal, Webflow, Wix, Squarespace and 18+ other content management systems with high accuracy.
Detect React, Vue, Angular, Next.js, Nuxt, Svelte, Astro, HTMX, Alpine.js and 25+ modern JavaScript frameworks and libraries.
Audit HSTS, CSP, X-Frame-Options, Referrer-Policy, COOP, Report-To and 12 critical security headers. Instantly know if a site is hardened against attacks.
Uncover Google Analytics, Meta Pixel, LinkedIn Insight, Hotjar, Clarity, Mixpanel, Plausible, TikTok Pixel and 20+ analytics or tracking tools in use.
Identify Cloudflare, Vercel, Netlify, AWS, Azure, Fastly, DigitalOcean and 15+ CDN/cloud providers to understand the infrastructure behind any site.
Detect Cookiebot, OneTrust, Osano, Usercentrics, CookieYes and other GDPR/CCPA compliance tools to verify privacy readiness.
Identify Mailchimp, Klaviyo, SendGrid, HubSpot, ActiveCampaign, ConvertKit and other email/automation platforms powering lead generation.
Spot Intercom, Drift, Crisp, Zendesk, LiveChat, Tawk.to and Freshchat integrations to gauge customer support infrastructure.
Check for title tags, meta descriptions, Open Graph, Twitter Cards, canonical URLs, JSON-LD schema, AMP and advanced SEO signals.
Identify UserWay, accessiBe, EqualWeb and Siteimprove overlays or native accessibility implementations.
No registration, no API key, no limits. Just paste a URL and get instant results.
Paste any website URL into the checker. We automatically handle HTTP/HTTPS and validate the address in real-time.
Our engine fetches the live page, parses HTML source, inspects HTTP headers, performs DNS lookup and geo-locates the IP.
Browse 22+ technology categories, quality scores, security audit, DNS records, SEO signals and link analysis — all in one view.
A website technology checker — also known as a web stack detector or "what is this site built with" tool — scans a website's public HTML source code, HTTP response headers and DNS records to identify every piece of software powering that site. From the content management system (CMS) and JavaScript frameworks to CDN providers, analytics platforms and payment gateways, a tech-stack checker gives developers, marketers and security researchers an instant, authoritative snapshot of how any site is built.
Understanding a competitor's or client's web stack helps you benchmark your own architecture, replicate high-performance patterns and spot outdated or vulnerable software before attackers do. For example, discovering that a rival e-commerce store uses Next.js on Vercel with Cloudflare CDN explains their sub-second load times — and gives you a technology roadmap to follow.
Modern websites are assembled from dozens of layers. A full stack commonly includes a CMS such as WordPress, Shopify or Webflow; a frontend framework like React, Vue or Svelte; a CSS framework such as Tailwind CSS or Bootstrap; a web server running Nginx or Apache behind a CDN like Cloudflare or AWS CloudFront; and analytics tools like Google Analytics 4, Hotjar or Microsoft Clarity. Each layer leaves identifiable fingerprints in the HTML, headers or DNS configuration.
Always cross-reference results with the site's robots.txt, sitemap and page source for maximum accuracy. Pay attention to security headers — missing HSTS or a Content Security Policy (CSP) are red flags. Check the technology trend over time: a site migrating from jQuery to React signals an active engineering investment. Use DNS records to identify hosting infrastructure and MX records to discover email providers.
Whether you are conducting a technical SEO audit, competitive research, security assessment or simply satisfying your curiosity, a robust website technology checker is an indispensable part of any digital professional's toolkit.
We offer 100+ free developer, SEO and AI tools — no sign-up, no limits. Discover your next favourite tool today.