Website Tech Stack Detector

How the Website Tech Stack Detector Works

This tool analyzes raw HTML source code to identify the technologies powering any website. It scans for known patterns in script sources, meta tags, CSS class names, inline scripts, and link tags that reveal the underlying tech stack. Unlike server-side detection tools, this runs entirely in your browser — no data leaves your device, making it safe for analyzing competitor sites, client projects, or internal applications.

The detector checks for over 40 technologies across 8 categories including JavaScript frameworks, CSS frameworks, content management systems, analytics platforms, CDN providers, font services, and server-side meta frameworks. Each detection uses multiple signals to minimize false positives.

What Technologies Can Be Detected

The detector identifies technologies across these categories: Frameworks like React, Vue, Angular, Svelte, Next.js, Nuxt, Astro, and Gatsby. CMS platforms including WordPress, Shopify, Wix, Squarespace, Webflow, Ghost, and Drupal. CSS frameworks such as Tailwind CSS, Bootstrap, Bulma, and Foundation. JavaScript libraries like jQuery, GSAP, Lenis, Three.js, Lodash, Axios, and Alpine.js. Analytics tools including Google Analytics 4, Google Tag Manager, Hotjar, Mixpanel, Segment, and Plausible. CDN providers like Cloudflare, AWS CloudFront, Fastly, and jsDelivr. Font services including Google Fonts, Adobe Fonts, and Font Awesome.

Use Cases for Tech Stack Detection

Developers use tech stack detection to research competitor implementations, evaluate potential technology choices, and audit existing projects. Freelancers use it to understand client websites before quoting migration or redesign work. Recruiters check company tech stacks to match candidates with relevant experience. Sales teams at SaaS companies identify prospects using competing tools. Security researchers audit sites for outdated libraries that may have known vulnerabilities.

The tool is particularly useful when evaluating websites that do not publicly disclose their technology choices. By examining the HTML source, you can identify frameworks, analytics tools, and infrastructure decisions that inform your own development strategy.

Tips for Accurate Detection

For the most accurate results, paste the complete HTML source from View Page Source (not Inspect Element, which shows the DOM after JavaScript execution). Some single-page applications render most content via JavaScript, so the initial HTML may show fewer technologies than the fully rendered page. Server-side rendered frameworks like Next.js and Nuxt leave clear signatures in the initial HTML, making them easier to detect from source alone.

Some websites use build tools that rename or bundle scripts, which can make detection harder. Look for the summary section after analysis, which shows confidence levels and total technologies detected. If you suspect a site uses a technology that was not detected, it may be loaded dynamically or bundled in a way that removes identifying signatures.