Website Technology Checker
Enter a web address to see the technologies behind it. The page is fetched once and compared with more than 250 fingerprints, covering content management systems, shop platforms, frameworks, servers, CDNs, analytics and widgets. Every result shows what gave it away.
- Encrypted connection
- No sign-up
- Free to use
How to use Website Technology Checker
- Enter the address of the page you want to analyse, with or without https://.
- Select Detect technologies.
- Browse the results, grouped by category such as CMS, JavaScript framework or CDN.
- Read the line under each name to see the header, cookie, tag or script that revealed it.
Website Technology Checker features
Evidence for every result
Each technology lists the exact header, cookie, meta tag, script address or markup that matched.
More than 250 fingerprints
CMS and shop systems, site builders, JavaScript and CSS frameworks, servers, hosting platforms, CDNs, analytics, payments, chat and consent tools.
Version numbers where exposed
When a site publishes a version, for example in a generator tag or a file name, it is shown next to the name.
Implied technologies
Dependencies that follow logically, such as PHP for WordPress or React for Next.js, are listed and clearly marked as implied.
Request details
The final address after redirects, the server's IP address, the Server header and the content type.
Safe fetching
Only public websites can be analysed; private and internal addresses are refused.
When to use Website Technology Checker
- Finding out which CMS or shop platform a competitor or a design you admire is built on.
- Checking what your own site reveals to visitors, including version numbers you may want to hide.
- Preparing a quote or migration by learning what stack a prospective client currently uses.
- Confirming that an analytics, consent or tag manager script is actually present on a page.
Website Technology Checker FAQ
How does the tool know what a website is built with?
Most technologies leave traces. WordPress loads files from /wp-content/, Shopify sends an X-ShopId header, Next.js embeds a __NEXT_DATA__ block, and many systems announce themselves in a generator meta tag. The tool fetches the page once and compares its headers, cookies, markup and script addresses with a database of such fingerprints.
Why is a technology I know the site uses not listed?
Only what is visible in a single response can be detected. Server-side software such as databases, programming languages behind a proxy, or tools that load after user interaction leave no trace in the page. Sites can also remove headers and generator tags on purpose.
What does “implied” mean?
An implied technology was not seen directly but is required by one that was. A site running WordPress necessarily runs PHP, even if no header says so. Implied entries name the technology they follow from.
Can the results be wrong?
A fingerprint can occasionally match by coincidence, for example when a page merely links to a file with a familiar name. That is why the evidence is shown: you can verify each result against the page source. Version numbers are reported only when the site itself exposes them.
Does the checked website notice the request?
It sees one ordinary page request from our server, like a single visit. No scanning, crawling or repeated requests take place.
Why do I get results for an error page?
Some sites answer automated requests with a block page or a login screen. The tool reports the HTTP status so you can tell, and the technologies shown then describe that page rather than the real site.
Reading a technology profile
A modern website is rarely a single product. A typical profile shows a content system or framework that produces the pages, a web server or hosting platform that delivers them, a content delivery network in front, and a layer of third-party scripts for analytics, advertising, fonts, consent banners and customer chat. Seeing these layers side by side explains a lot about how a site was built and what it costs to run.
The strongest signals come from the server itself. Response headers such as Server, X-Powered-By or CF-Ray are sent before any content and are hard to fake by accident. Cookies are similarly telling: a PHPSESSID cookie means PHP, laravel_session means Laravel. Markup comes next: generator meta tags, characteristic paths like /_next/static/ and attributes such as data-wf-site that page builders add to every page. Script addresses reveal libraries and services, often including the version in the file name.
There are limits worth keeping in mind. The tool sees one page, so a technology used only in the checkout or the account area will be missed. It does not run JavaScript, so widgets injected later by a tag manager stay invisible unless their loader is in the source. And a carefully configured site may reveal almost nothing, which is a result in itself: many security guidelines recommend hiding version numbers and unnecessary headers.
If you are reviewing your own site, treat the list as a view from outside. Anything shown with a version number is information an attacker can match against known vulnerabilities, so keeping those components updated, or removing the version from public view, is worthwhile.