How does the Tech Stack Detector work?

The tool makes a server-side HTTP GET request to the URL you enter, then analyzes the response headers and HTML source code using pattern matching. It checks for known signatures — script paths, meta tags, CSS classes, response header values — associated with specific technologies.

Is this tool the same as BuiltWith or Wappalyzer?

Our detector uses a similar principle — header and HTML pattern matching — but runs server-side with no browser extension required. BuiltWith and Wappalyzer have larger signature databases built up over years; our tool focuses on the most widely-used technologies and is completely free with no account required.

Why are some technologies not detected?

Detection depends on observable signals: HTTP headers and HTML patterns. Some technologies are deliberately hidden by their operators (custom server headers, minified scripts with no identifiable paths), or use CDN layers that obscure the origin server. If a technology leaves no detectable fingerprint, it will not appear in the results.

Can I detect the tech stack of a password-protected or JavaScript-only site?

The tool fetches the initial HTML response without executing JavaScript and without authenticating. It can still detect technologies that appear in the static HTML or headers. JavaScript-heavy SPAs that render nothing server-side will show fewer signals; login-protected pages will show the tech stack of the login page only.

Will the target website know I scanned it?

The tool sends a standard HTTP GET request with a descriptive User-Agent header ('TechStackBot/1.0'). It appears in the target server's access logs like any other bot request. No stealth scanning is performed.

Can I scan localhost or an internal IP?

No. The tool blocks requests to localhost, 127.x, 10.x, 192.168.x, 172.16–31.x, and other private address ranges to prevent server-side request forgery (SSRF). Only publicly accessible URLs are accepted.

How accurate are the results?

For sites that expose standard fingerprints, accuracy is high. WordPress sites, Next.js apps, Cloudflare-proxied sites, and Nginx servers are reliably detected. Custom or obfuscated setups are harder to identify. Treat results as strong indicators, not guarantees.

Which technologies can the tool detect?

The detector covers 44 technologies across 9 categories: CMS (WordPress, Shopify, Wix, Squarespace, Blogger, Ghost, Webflow, Drupal, Joomla), JavaScript Frameworks (Next.js, Nuxt.js, React, Vue.js, Angular, Svelte), JavaScript Libraries (jQuery, Alpine.js, GSAP, Three.js, Chart.js), UI Frameworks (Bootstrap, Tailwind CSS, Bulma, Foundation, Material UI), Analytics (Google Analytics, Google Tag Manager, Hotjar, Mixpanel), Fonts & Scripts (Google Fonts, Adobe Fonts), CDN / Hosting (Cloudflare, CloudFront, BunnyCDN, jsDelivr, Fastly, Vercel), Server / Runtime (Nginx, Apache, IIS), and Programming Language (PHP, Node.js, Python, Ruby, Java, ASP.NET).

Is the detected tech stack data stored?

No. The URL is fetched and analyzed in real time during your request. Neither the URL nor the detection results are stored after the response is returned.

Can I use this to check my own website?

Yes. Many developers use the tool to verify that their stack is not inadvertently exposing technology fingerprints — for example, to confirm that the X-Powered-By header is suppressed or that a CDN is correctly detected as Cloudflare.

Tech Stack Detector — See What Any Website Is Built With

Enter any public URL and our Tech Stack Detector will fetch the page server-side, analyze HTTP response headers and HTML source code, and identify the technologies powering it — from the CMS and JavaScript framework to analytics platforms, CDN providers, and web server software.

How to Use the Tech Stack Detector — Identify Any Website's Technology

1
Enter the full URL of the website you want to analyze (including https://).
2
Click 'Detect Stack'. The tool fetches the page server-side and analyzes response headers and HTML.
3
Review the detected technologies, grouped by category: CMS, JavaScript Framework, UI Framework, Analytics, CDN / Hosting, and Server / Runtime.
4
Use the results to research competitors, audit your own site, or choose technologies for your next project.

Why Use Tech Stack Detector — Identify Any Website's Technology?

Understanding the technology stack behind a successful website helps developers make informed architecture decisions, lets marketers benchmark competitors, and helps agencies pitch clients with relevant case studies. Traditional ways of detecting a tech stack — viewing page source, inspecting network requests — are time-consuming and easy to miss. Our detector automates this by making a real server-side HTTP request to the target URL and running pattern matching against response headers and HTML content. The result is a categorized list of technologies in seconds, with no browser extension to install and no account to create.

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