Technology Stack Checker

Discover what technologies a website is built with — web server, CDN, analytics, JavaScript frameworks, CSS frameworks, CMS, ecommerce platforms, font services, security headers, and more. Get a comprehensive technology profile with detailed analysis.

Analyze Technology Stack

Enter any website URL to analyze its technology stack. The tool examines HTTP headers and HTML source code.
Quick test:

About the Technology Stack Checker

This tool analyzes any public website to detect its technology stack — the collection of software, frameworks, services, and infrastructure components that power it. By examining HTTP response headers and scanning the HTML source code, the tool identifies:

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Web Server & Hosting

Identifies Apache, Nginx, IIS, Cloudflare, and hosting providers from server headers and response signatures.

CDN & Proxy Services

Detects Cloudflare, Fastly, Akamai, AWS CloudFront, Sucuri, Varnish, and other content delivery networks.

Analytics & Tracking

Finds Google Analytics, Facebook Pixel, Hotjar, Mixpanel, Amplitude, Plausible, Microsoft Clarity, and more.

Why Understanding the Technology Stack Matters

Knowing a website's technology stack is valuable for many reasons:

  • Competitive analysis — Benchmark your technology choices against competitors. If all top performers in your niche use a specific CDN or CMS, it may be worth evaluating.
  • Performance optimization — Identifying cache layers (Varnish, Cloudflare) and performance plugins helps understand why a site loads fast or slow.
  • Security assessment — Knowing the server software, CMS version, and security headers helps evaluate a site's security posture. Missing security headers are a common finding.
  • Technology procurement — When selecting a CMS, CDN, or analytics platform, seeing what real-world sites use helps inform your decision.
  • Migration planning — Understanding a site's current stack is the first step in planning a migration to new hosting, a different CMS, or a headless architecture.
  • SEO diagnostics — Certain technologies (slow JavaScript frameworks, missing CDN, lack of cache headers) can impact Core Web Vitals and search rankings.

How Technology Detection Works

The tool uses two primary detection methods:

  1. HTTP Header Analysis:Response headers like Server, X-Powered-By, CF-Ray, X-Cache, and many others are checked against known patterns for server software, CDN providers, caching layers, and security configurations.
  2. HTML Source Scanning:The raw HTML of the page is scanned for JavaScript snippets, CSS class names, comment tags, meta generators, script/link source URLs, and other patterns that reveal specific technologies.

Note: Technologies loaded dynamically via JavaScript after page load (SPA routes, lazy-loaded resources) may not be detected. Results are best-effort based on what is visible in the initial HTTP response.

Frequently Asked Questions

A technology stack (or tech stack) is the combination of software products and programming languages used to build and run a website. It includes the web server, hosting infrastructure, content management system (CMS), JavaScript frameworks, CSS frameworks, analytics tools, CDN services, and more. Understanding a site's tech stack helps with competitive analysis, security assessments, and performance optimization.
The tool analyzes HTTP response headers and the HTML source of the page. Headers like Server, X-Powered-By, and CF-Ray reveal the web server and CDN. The HTML body is scanned for JavaScript snippets, CSS class names, meta tags, and script sources that reveal frameworks (React, Vue.js, Angular), analytics (Google Analytics, Facebook Pixel), and other services (CMS platforms, ecommerce systems, font providers). Not all technologies are detectable — some may be hidden or obfuscated.
Knowing a competitor's tech stack helps you benchmark your own technology choices. It reveals which platforms are popular in your industry, which CDN providers offer the best performance, and which analytics tools your competitors trust. For developers, it helps identify potential security vulnerabilities or integration opportunities. For SEO professionals, understanding how a site is built informs technical audit recommendations.
No — the Technology Stack Checker detects publicly visible signals only. Some technologies are undetectable because they run server-side (database systems, backend languages like Python or Go) or are obfuscated. Technologies loaded after the initial page load (single-page application routes, lazy-loaded scripts) may not appear in the raw HTML. The tool provides a best-effort analysis based on what is visible in the initial HTTP response.
A web server (like Apache or Nginx) is the software that serves the actual page content from the hosting server. A CDN (Content Delivery Network) like Cloudflare or Fastly is a distributed network of servers that cache and deliver content from locations closer to the visitor. Many sites use both — the CDN sits in front of the origin server. The Technology Stack Checker can detect both through HTTP headers like Server and CF-Ray.
Detection accuracy varies by technology. HTTP header-based detection (server software, CDN, caching layer) is typically very reliable because these values are set by the infrastructure itself. HTML-based detection (frameworks, analytics, CMS) relies on pattern matching in the page source, which can produce false positives or misses if the site uses custom builds or minified code. Always verify the results by inspecting the site directly.
Yes — the Technology Stack Checker is excellent for competitive analysis. Enter a competitor's URL to discover which hosting provider, CDN, analytics platform, frameworks, and CMS they use. This intelligence helps you make informed decisions about your own technology stack. Combine it with other YourSEOToolbox.com tools like the SEO Audit Checker and Redirect Checker for a comprehensive competitive audit.
Yes — the tool accepts any valid HTTP or HTTPS URL, including subdomains (blog.example.com, shop.example.com), deep paths (example.com/blog/post), and international domains. If you omit the protocol (http:// or https://), the tool automatically prepends https://. Some subdomains may use different technology stacks than the main domain, which is useful to discover.
If a website requires authentication or displays a login page before the actual content, the tool will analyze the login page's technology stack rather than the protected content. Many login pages still reveal the underlying technology through headers (server software, CDN) and scripts (JS frameworks, analytics). For full analysis, you would need access to the authenticated pages.