Free SEO Tool

Free Website Technology Checker

Find out what technology a website uses: the CMS, frameworks, hosting, CDN and analytics behind any domain, grouped by what each one does. No sign-up required.

How to check a website's technology

1. Enter a domain

Any public website. You do not need the full URL, the bare domain is enough.

2. See the stack

Technologies grouped by what they do: servers and hosting, web development, security, analytics and sales tools.

3. Copy or compare

Copy the whole list, then run a competitor to see where the two setups differ.

How technology detection works

Every site broadcasts more than it means to. Detection reads those public signals: HTTP response headers that name the server and CDN, the filenames and contents of the scripts a page loads, meta tags such as the generator tag most content management systems still emit, and predictable asset paths like wp-content or cdn.shopify.com.

None of this requires access to the site, and none of it is private. It is the same information your browser receives on every visit, read systematically rather than by eye.

That also defines the limit. Anything that runs entirely on the server, loads after the initial render, or sits behind a strict CDN can be invisible. A short result does not mean a simple site.

What a tech stack checker can identify

Some layers are almost always visible. One of them usually is not.

Layer	Examples	How it is detected
CMS and platform	WordPress, Shopify, Webflow, Drupal, HubSpot	Detectable from markup patterns, meta generator tags and predictable asset paths.
Frameworks and libraries	React, Next.js, Vue, Angular, jQuery	Detectable from bundle filenames, global variables and framework-specific markup attributes.
Hosting and CDN	Vercel, AWS, Cloudflare, Netlify, Fastly	Detectable from response headers and DNS, which is why this layer is the most reliable of all.
Analytics and tags	Google Analytics, Tag Manager, Hotjar, Segment	Detectable from the script sources loaded on the page.
Security and certificates	Cloudflare, DataDome, Arkose Labs, Let's Encrypt	Detectable from headers, challenge pages and the certificate authority that issued the site's certificate.
Payments and sales	Stripe, Klarna, Plaid, Intercom	Detectable from embedded checkout and widget scripts.

Why the stack matters for SEO

The platform a competitor uses is not why they rank, and it is worth saying that plainly before anyone rebuilds a site on the strength of a stack lookup. Content and links decide positions. Technology decides how hard it is to publish that content well.

Where it does matter is diagnosis. A site rendering entirely on the client can have indexing problems no amount of content fixes. A missing CDN shows up in Core Web Vitals. A CMS without control over titles and canonicals puts a ceiling on on-page work.

The other honest use is competitive research: knowing a competitor runs on Shopify tells you what their URL structure and pagination will look like before you audit a single page.

Frequently asked questions

How do I check the technology of a website?

Enter the domain in the tool above and it returns the technologies detected on that site, grouped by what they do. You can also do it by hand: open developer tools, look at the response headers for the server and CDN, and check the script sources in the network tab for analytics and frameworks. The tool is faster and covers layers that are easy to miss manually.

How can I find out what technologies are used in a website?

Detection works from public signals a site sends anyway: HTTP response headers, the filenames and contents of scripts it loads, meta tags such as the generator tag, and predictable asset paths. None of it requires access to the site. That also sets the limit, since anything running purely on the server leaves no client-side trace.

What software does this website use?

That depends on the layer you mean. Most sites combine a CMS or platform, a frontend framework, a hosting provider, a CDN, analytics and often a payments or chat widget. The tool above separates these into groups so you can see the shape of the stack rather than one undifferentiated list of names.

What is a website BuiltWith?

BuiltWith is a commercial technology profiler that has indexed sites for years and is the best known tool in this category, generally reporting more technologies than free alternatives including this one. The phrase also gets used generically to mean the stack behind a site. If you need an exhaustive historical profile, BuiltWith is the stronger option; for a quick free answer, the tool above will do.

How to tell what software a website is BuiltWith?

Check the response headers for the server, CDN and platform, look at the script sources for frameworks and analytics, and check the page source for a meta generator tag, which many content management systems still emit. The tool above does all three at once and groups the results, which is quicker than reading network requests yourself.

What are most websites BuiltWith?

WordPress remains the single most common platform by a wide margin, powering roughly 40 percent of the web, followed by Shopify for ecommerce and website builders such as Wix and Squarespace. On the frontend, React is the most widely deployed framework. Nginx and Apache still serve the majority of sites, increasingly behind Cloudflare.

How to find out what framework a website is using?

Frontend frameworks leave recognisable traces: bundle filenames, global variables such as React or Vue on the window object, and framework-specific markup attributes. Next.js sites carry a __NEXT_DATA__ script tag, for instance. The tool above reports frameworks under web development. Backend frameworks are much harder, since they usually leave nothing visible.

How to tell what backend a website is using?

Often you cannot, and any tool claiming certainty here is overstating it. Backends run on the server and leave no client-side trace by design. What you sometimes get is indirect: a server header naming Nginx or Apache, a session cookie whose name hints at the language, or a file extension in a URL. Absence of evidence is common and is not evidence of absence.

How do I know which platform was used to create a website?

Platforms are the easiest layer to identify because they leave deliberate fingerprints. WordPress emits a generator meta tag and serves assets from wp-content paths. Shopify exposes a Shopify object and cdn.shopify.com asset URLs. Wix, Squarespace and Webflow all use recognisable asset domains. The tool above reports these under CMS.

How to find out what program was used to make a website?

If you mean the platform, see above: the tool identifies CMS and site builders directly. If you mean the code editor or design tool the developers used, that is not detectable, since nothing about the editor survives into the published output. The occasional exception is a design tool that exports with recognisable class naming.

How to figure out who developed a website?

Technology detection will not tell you this, and the tool above does not try. The usual routes are a credit link in the footer, an agency case study naming the client, or a WHOIS lookup on the domain, though most registrations are behind privacy services now. Knowing the stack narrows the field of likely agencies but does not identify one.

Which type of website is this?

The stack usually implies the type. Shopify or WooCommerce means ecommerce, WordPress with a blog theme means publishing, and a React or Next.js app behind a login means a SaaS product. The tool reports the page title alongside the technologies, which together usually answer the question faster than the site itself does.

Does Google have a website checker?

Not for technology detection. Google publishes Search Console for your own verified sites, PageSpeed Insights for performance, and the Rich Results Test for structured data, none of which report a technology stack. For speed on any URL, our Core Web Vitals checker uses the same Lighthouse engine Google does.

Why does this show fewer technologies than other tools?

Detection depth varies with how each tool crawls. Sites behind a strict CDN, or that load most functionality after the initial render, expose far less than a simple server-rendered page. Commercial profilers such as BuiltWith also maintain much larger fingerprint databases built over years. This tool is honest about being a quick free check rather than an exhaustive audit.

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