How to Check What Technology a Website Uses

Ever wondered how a website was built? You can often identify its content management system, programming frameworks, analytics tools and hosting infrastructure with a few simple checks. This can be useful when researching competitors, choosing tools for your own site or troubleshooting a technical issue.

Website technology checks are not always definitive. Some sites hide or alter technical details, and detection tools may make educated guesses based on clues. For the best results, compare information from more than one source.

Use a website technology checker

The quickest option is to use an online technology-detection service. Tools such as Wappalyzer and BuiltWith can scan a website and report technologies they recognise. Depending on the site, the results may include:

• Content management systems, such as WordPress or Drupal
• JavaScript frameworks and libraries
• E-commerce platforms and payment services
• Analytics, advertising and marketing tools
• Web servers, hosting providers and content delivery networks

Enter the website address into the checker and review its results. Some tools are also available as browser extensions, allowing you to inspect a page while browsing.

Keep in mind: these services detect technologies from publicly visible clues. They may miss tools that are loaded only on certain pages, and they can sometimes identify a technology incorrectly.

Inspect the page source

A website’s HTML can reveal useful details. In most desktop browsers, right-click the page and choose View Page Source. You can also use the browser’s menu to find this option.

Look for clues such as:

• References to a content management system in file paths or comments
• Names of JavaScript or CSS files that suggest a framework or plugin
• Meta tags that identify a platform or generator
• Links to third-party services, such as analytics or chat tools

For example, some WordPress sites include paths containing /wp-content/ or /wp-includes/. However, these clues can be removed, renamed or hidden, so their absence does not prove that a site uses a different system.

Use your browser’s developer tools

Developer tools provide a closer look at the files and requests a page uses. In many browsers, you can open them by pressing F12 or Ctrl+Shift+I on Windows, or Option+Command+I on macOS.

Try these sections:

• Elements or Inspector: view the page’s HTML and CSS.
• Network: see which files and services load when the page opens. Reload the page with this panel open to capture the requests.
• Sources or Debugger: inspect JavaScript and stylesheet files.
• Application or Storage: review cookies, local storage and service workers used by the site.

File names, request addresses and cookie names may point to particular platforms or services. Minified or bundled files can make the results harder to interpret, and a single website may combine technologies from many providers.

Check response headers

When a browser requests a web page, the server sends back response headers. Some headers disclose details about the server or software, although many websites remove or change them.

To view headers, open the browser’s developer tools, select the Network tab, reload the page and choose the main document request. Look for the response headers. A header such as server may offer a clue about the web server, while other headers can indicate caching or security services.

Headers should not be treated as proof. They can be masked, generic or supplied by an intermediary such as a content delivery network.

Look up DNS and hosting information

DNS records help connect a domain name to the services behind it. Public DNS lookup tools can show records such as A, AAAA, MX and NS. These may reveal the domain’s hosting or email provider, or show that traffic is routed through a content delivery network.

Keep the distinction clear: the provider shown in a DNS lookup may handle only one part of the website. A site could use one company for domain registration, another for hosting, and a third for security or content delivery.

Review visible features

Some technologies can be inferred from what the site does. A particular checkout flow may suggest an e-commerce platform, while a distinctive booking widget or embedded video player may come from a third-party service.

This approach is useful for forming a shortlist, but visual similarities are not conclusive. Many platforms can produce similar designs, and websites often use custom-built features.

How to get more reliable results

• Check several pages, not just the homepage. Different sections may use different tools.
• Compare an online checker’s findings with the page source or developer tools.
• Separate confirmed clues from assumptions.
• Remember that websites change. A scan is only a snapshot of what was detectable at that time.
• Do not attempt to access private systems or bypass security controls. Stick to information publicly available through ordinary browsing and legitimate lookup tools.

What a technology check can and cannot tell you

A technology checker can help you understand a website’s visible setup, but it rarely reveals the complete picture. It may identify a CMS, a JavaScript library or an analytics service while missing custom code, back-end systems and tools that are not exposed to visitors.

For a quick overview, start with a reputable detection service. If you need to verify a particular result, inspect the page source and browser network requests. Using several methods together gives you a more balanced view of how a website may have been built.

 

7 Effective Tips for Identifying Website Technology

1. Use a technology lookup tool such as Wappalyzer or BuiltWith.
2. Check the page source for clues like framework names and script files.
3. Open your browser’s developer tools and inspect the Network tab.
4. Look at response headers for server and platform information.
5. Check cookies for names linked to common content management systems.
6. Inspect image and asset URLs for platform-specific paths.
7. Treat findings as clues, as websites can hide or change their technology.

Use a technology lookup tool such as Wappalyzer or BuiltWith.

Use a technology lookup tool such as Wappalyzer or BuiltWith to get a quick overview of the software behind a website. Enter the site’s URL, and the tool may identify its content management system, analytics services, e-commerce platform, hosting provider and other technologies. Results are based on clues visible to the tool, so they may not show everything or may occasionally be inaccurate; check important findings against another source.

Check the page source for clues like framework names and script files.

Check a website’s page source for clues about the technology behind it. Right-click the page and select “View Page Source”, then look for framework names, file paths and script files that may identify its content management system, JavaScript libraries or other tools. These clues can be useful, but they are not always conclusive: websites can hide or rename files, and a site may use several technologies at once.

Open your browser’s developer tools and inspect the Network tab.

Open your browser’s developer tools and select the Network tab to see the files and services a website loads. Refresh the page while the tab is open, then review the requests for clues such as script names, image hosts, analytics tools or content delivery networks. These details can help identify the technologies behind the site, although they may not reveal its full set-up.

Look at response headers for server and platform information.

Check a website’s response headers to look for clues about its server and platform. In your browser’s developer tools, open the Network tab, reload the page and select the main page request to view its headers. Entries such as server may identify the web server or a service handling the site’s traffic. Treat these details as clues rather than confirmation, as websites can hide, change or mask header information.

Check cookies for names linked to common content management systems.

Check the website’s cookies for names associated with common content management systems or plugins. You can usually find them in your browser’s developer tools under the “Application” or “Storage” tab, or in the site’s privacy settings. Some cookie names may offer clues about the platform in use, but they are not definitive: sites can rename or remove cookies, and third-party services may set them too.

Inspect image and asset URLs for platform-specific paths.

Inspect image and asset URLs for platform-specific paths that may reveal which platform a website uses. For example, file addresses containing familiar directory names or plugin folders can point to a particular content management system or e-commerce service. To check, right-click an image and open it in a new tab, or use your browser’s developer tools to review image, script and stylesheet URLs. Treat these clues as indications rather than proof: websites can rename, proxy or host assets on a separate content delivery network.

Treat findings as clues, as websites can hide or change their technology.

Treat any technology you identify as a clue rather than a certainty. Websites can hide, rename or modify details about the tools they use, and some technologies are only visible on specific pages or under certain conditions. For a more reliable picture, compare findings from several sources and remember that detection tools can make mistakes.