Website Tech Stack Detector
Paste a website's HTML source code to instantly detect its tech stack — frameworks, CMS, CSS libraries, JavaScript libraries, analytics, CDN, fonts, and more. 100% client-side and private.
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 Security researchers audit sites for outdated libraries that may have known vulnerabilities.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.
Frequently Asked Questions
How does the tech stack detector work?
It analyzes the raw HTML source code you paste by scanning for known patterns — script URLs, meta generator tags, CSS class naming conventions, inline script signatures, and link tag references. Each technology has multiple detection signals to ensure accurate identification.
Is my data safe? Does the HTML leave my browser?
Yes, completely safe. All analysis runs 100% client-side in your browser using JavaScript. No data is sent to any server. Your pasted HTML is never stored, logged, or transmitted anywhere.
Why should I use View Page Source instead of Inspect Element?
View Page Source shows the original HTML sent by the server, which contains the clearest technology signatures (script tags, meta tags, link tags). Inspect Element shows the live DOM after JavaScript has modified it, which can be different and sometimes harder to analyze.
Can it detect server-side technologies like Node.js or PHP?
It can detect server-side frameworks that leave signatures in HTML, such as Next.js (__NEXT_DATA__), Nuxt (__nuxt), WordPress (wp-content), and Laravel (csrf-token). Pure backend languages like raw Node.js or Python without a framework usually leave no HTML signatures.
What if a technology is not detected?
Some sites use build tools that bundle and minify scripts, removing identifying names. Others load technologies dynamically after initial page load. If detection misses something, try pasting the fully rendered HTML from Inspect Element as a secondary check.
Can I detect technologies from a URL directly?
Due to browser security (CORS), this tool cannot fetch arbitrary URLs directly. You need to manually copy the page source. Right-click the target page, select View Page Source, copy all the HTML, and paste it into the tool.