Website Technology Lookup
Find out what a website is built with. CMS, framework, hosting, CDN, analytics and payments for any domain. Free, no signup.
Looking for an expired domain with backlinks? Browse the directory
Enter a domain and the lookup lists the technologies the site exposes: the content management system or framework it runs, the server and CDN in front of it, the analytics and marketing scripts it loads, and the security and payment services it uses.
Detection is by fingerprint. Every match is a signature the site actually sent to a crawler, so the result is what could be seen from outside, not everything the site runs. The page explains what that includes and what it can miss.
What is this website built with?
Enter any domain to see the technology stack it exposes
Looking for an expired domain with backlinks?
Browse expired domains with referring domains, archive history and authority shown before the name is revealed.
What technologies we detect
Four categories of detection, all read from the one homepage we load for you.
CMS and frameworks
WordPress, Shopify, Webflow, Drupal, Ghost and the other content management systems, plus frameworks such as React, Next.js, Vue and Angular.
Servers and hosting
AWS, Cloudflare, Nginx, Apache, Vercel, Netlify and other hosting providers, CDNs and web servers, read from headers and asset paths.
Analytics and marketing
Google Analytics, Hotjar, HubSpot, Mailchimp and the other tracking, analytics and marketing scripts a page loads.
Security and payments
TLS and HSTS settings, Stripe, PayPal and the other security features and payment processors a site exposes.
Read live from the site's homepage and matched against our own fingerprint list. One page, not the whole site.
How this technology lookup works
Fingerprints, not guesses. What the lookup reads, what it can miss, and how to use the result.
How a website's technology is detected
Most software leaves a signature on the pages it serves. WordPress puts wp-content in asset paths. Shopify sets its own cookies and serves from its CDN. Next.js ships a script tag every page shares. A web server names itself in the Server header. When you enter a domain we load its homepage once, over HTTPS (HTTP if that fails), and match the HTML, HTTP headers, cookies, script URLs, stylesheet URLs and meta tags against a list of these fingerprints that we maintain. Every match is listed, and nothing is added from anywhere else.
What the result shows
Technologies grouped by category: content management and frameworks, servers and hosting, analytics and marketing, security and payments. A count of technologies and of categories. The HTTP status the homepage answered with, and the host that answered after any redirects. And any social profile links found in the homepage.
What it can miss
It reads one page, once. Anything a site loads later with JavaScript, anything on other pages, and anything on the server that sends no tell is invisible to it. A site behind a login, a site that shows bots different markup or a bot-check page, or a stack that hides its signatures will show fewer technologies than it uses. A hand-built site with no framework can show almost nothing. Our list covers the common technologies well, about eighty of them, and not the long tail. The result is live, so it reflects the homepage as it is now. A short result is a limit of detection, not a verdict on the site.
What people use it for
Competitive research is the common case: which platform a site in your market runs, which analytics it loads, whether it sells through Shopify or WooCommerce. It is also used before rebuilding on an expired domain, to see what the last site ran and whether anything of it survives on the live name. Read the archived history in the expired domain checker alongside it, and the guide to rebuilding on a domain you have bought is linked below.
When the lookup fails
If the homepage cannot be loaded, because the site is down, refuses automated requests, takes too long or does not serve a web page, the page says so under the form and shows nothing. It never shows a guessed stack. For safety we only load public websites on ports 80 and 443, we cap the page size and the time we wait, and we do not follow redirects to private addresses.
Frequently asked questions
How do I find out what a website is built with?
Enter the domain above. The lookup loads the site's homepage and reads the fingerprints it leaves in its HTML, HTTP headers, cookies, script URLs and meta tags, matches them against our own list of known technologies, and lists every match by category: CMS, framework, hosting, analytics, security and payments.
Is this website technology lookup free?
Yes. No signup, no card, and no usage cap beyond a per-visitor rate limit. Enter a domain and you get its stack.
Which CMS platforms can it detect?
WordPress, Shopify, Wix, Squarespace, Webflow, Drupal, Joomla and Ghost, among others. E-commerce platforms too: Magento, WooCommerce and BigCommerce.
Why does the lookup show nothing for a site?
Either the site showed our request a bot-check page or little markup, or it exposes few signatures: a login wall, a page built entirely by JavaScript, or a hand-built stack with no framework. A short or empty result is a limit of detection, not proof that the site uses nothing.
Is this like BuiltWith or Wappalyzer?
It does the same kind of job: working out what a site is built with from the fingerprints it exposes. Ours is free, reads one homepage live, and covers the common technologies rather than thousands, so use it for quick checks and use a larger database for the long tail.
Read next
Browse expired domains with backlinks
Rebuilding on an expired domain starts with what the last site was. The directory lists expired domains with backlinks, with archive history and referring domains shown before the name.