Zero Snippet

Website technology detector for CMS, frameworks, analytics & CDNs

Run a free website stack check on any public page. Our technology fingerprint scanner downloads the HTML response, inspects HTTP headers and inline markup, and surfaces likely CMS platforms (WordPress, Shopify, Webflow, and more), JavaScript frameworks and meta-frameworks (Next.js, Nuxt, Gatsby, plus cautious heuristics for React and Vue), analytics & tag managers (Google Tag Manager, GA4, Meta Pixel, Hotjar, Plausible, Matomo), CDN & edge hosts (Cloudflare, Fastly, Vercel, Netlify), marketing widgets, font CDNs, and common security embeds such as reCAPTCHA—ideal for competitive research, agency pitches, and due diligence before migrations.

What is a website technology detector?

A website technology detector (sometimes called a stack checker or built-with style scanner) automates the boring parts of answering: "What powers this page?" Instead of manually viewing source and memorizing script hostnames, you fetch a representative URL once and compare the response against a curated rule list spanning CMS footprints, framework markers, analytics vendors, and infrastructure headers. The output is investigative signal—fast, transparent, and easy to cross-check—not a legal warranty about every dependency in a production bundle.

Teams use these scans for SEO audits (understanding tag weight and render paths), sales research, security questionnaires that ask which third parties touch PII pages, and migration planning when you need to know whether a prospect is already on Shopify, Webflow, or a headless React stack. Pair this page with our HTTP header checker for raw cache, security, and CORS values, the meta tags extractor when you care about title tags and Open Graph, and the SSL certificate checker to validate TLS before you trust a redirect-heavy marketing domain.

How to use this technology detector (step by step)

  1. Pick a public URL that reflects the experience you want to study—often the marketing homepage, a popular landing page, or a docs portal. Authenticated dashboards and JSON APIs typically expose fewer marketing scripts than consumer pages.
  2. Paste the address into the field (https:// is optional). Click Detect technologies. We resolve DNS with the same SSRF protections as our other URL tools, follow redirects safely, and cap how much HTML we parse so scans stay responsive.
  3. Read grouped results: CMS, frameworks, analytics, CDN, and more. Each hit includes a short evidence string plus a confidence band (high, medium, low). Treat low-confidence framework rows as prompts to verify manually.
  4. Follow up with specialized tools. Use the redirect chain checker if marketing domains bounce through country or device rules, the response code checker for quick status validation, and the DNS lookup tool when a brand-new hostname has not propagated yet.

CMS detection: WordPress, Shopify, Webflow, and beyond

Content systems leave durable clues: meta name="generator" tags, predictable asset paths such as /wp-content/, Shopify CDN hostnames, or Webflow data attributes. Our detector prioritizes vendor-specific URLs and headers over generic strings so you see fewer noisy matches. When you need registration timelines to complement stack research, open the domain age checker and WHOIS lookup for registrar-level context.

Framework fingerprints: Next.js, Nuxt, Gatsby, and SPAs

Modern frameworks often embed recognizable markers—Next.js may ship /_next/static/ assets or structured bootstrap payloads, while Nuxt and Gatsby advertise their runtimes in predictable ways. Single-page apps that hydrate entirely in the browser can look "empty" to a single fetch; that absence is itself a clue to try a different route or inspect network waterfalls locally. Combine this scan with our Open Graph preview and canonical tag checker when you are judging how seriously a team invests in share cards and indexation hygiene.

Analytics, tags, and third-party risk

Marketing stacks are easiest to spot because vendors want stable endpoints—think Google Tag Manager, GA4, Meta Pixel, Hotjar, or Plausible. Seeing a tag does not tell you whether it fires on every page, respects consent banners, or loads only after interaction; it simply confirms the snippet is present in the HTML we retrieved. For crawlability side effects, also run the robots.txt checker and broken link checker on representative templates.

CDN and edge detection (Cloudflare, Fastly, Vercel, Netlify)

Infrastructure often announces itself in headers—CF-Ray for Cloudflare, x-vercel-id on Vercel, x-nf-request-id on Netlify, or x-served-by hints for Fastly. These signals explain why two visually similar sites behave differently under cache busting, bot management, or regional routing. When you also need IP-level context for an origin you discover, use our IP address lookup after resolving A/AAAA records with DNS tools.

Limitations every stack checker shares

No remote scanner can see inside private networks, execute arbitrary JavaScript, or bypass bot challenges meant for humans. Hosts that throttle datacenter IPs may return sparse HTML; sites that split experiments by cookie will show only one variant per request. Use this utility as a first-pass reconnaissance layer, then validate in your browser devtools or a dedicated RUM product when stakes are high.

Related free tools

Explore the full website and URL tools collection for more utilities, or jump to a focused checker below.

  • Broken Link Checker — Scan outbound links from any URL for 404s and broken hrefs—paste a page and audit links in seconds.
  • HTTP Header Checker — Inspect HTTP response headers for any URL: cache control, content-type, CORS, and security-related values.
  • Redirect Chain Checker — Trace the full redirect path to the final URL and spot unnecessary hops hurting SEO and performance.
  • SSL Certificate Checker — Verify TLS certificate validity, expiry, issuer, and chain for any domain before users hit errors.
  • DNS Lookup Tool — Query A, AAAA, MX, CNAME, TXT, NS, and SOA records for troubleshooting email, hosting, and DNS.
  • WHOIS Lookup — Look up domain registration details: registrar, dates, and status for research and due diligence.
  • IP Address Lookup — Resolve IPv4 or IPv6 to geolocation, ISP, ASN, and hostname for network and fraud analysis.
  • Domain Age Checker — See how long a domain has been registered—useful for SEO trust signals and quick vetting.
  • Robots.txt Checker — Fetch and review robots.txt rules, directives, and sitemap lines to catch crawler misconfiguration.
  • Meta Tags Extractor — Extract title, meta description, Open Graph, Twitter Card, and canonical tags from any live URL.
  • Open Graph Preview — Preview how a link may appear when shared on social networks before you publish or pitch.
  • Canonical Tag Checker — Confirm canonical tags, targets, and self-references to reduce duplicate-content SEO issues.

Frequently asked questions

What does the website technology detector identify?
It fetches the public HTML of a URL you provide and scans the document plus HTTP response headers for fingerprints of common CMS platforms (WordPress, Shopify, Webflow, and others), JavaScript frameworks and meta-frameworks (Next.js, Nuxt, Gatsby, and heuristic signals for React/Vue/Angular), CDNs and edge hosts (Cloudflare, Fastly, Vercel, Netlify), analytics and tag managers (Google Tag Manager, GA4, Meta Pixel, Hotjar, Plausible, Matomo), marketing widgets (HubSpot, Intercom), payments (Stripe, PayPal), fonts, and some security widgets like reCAPTCHA. Results are best-effort clues for research—not a guaranteed inventory of every dependency.
Is technology detection 100% accurate?
No. Sites can minify or obfuscate scripts, load technologies only after login, use server-side rendering with few client fingerprints, or block automated fetches. A missing hit does not prove a stack is absent; a heuristic hit (especially for generic frameworks) can occasionally be a false positive. Cross-check with our HTTP header checker, SSL certificate checker, and manual inspection when decisions matter.
Why do some results say “heuristic”?
Heuristic matches rely on common DOM attributes or strings that many sites share. They are useful for quick triage but weaker than vendor-specific script URLs, meta generators, or distinctive headers. Treat low-confidence rows as hints to verify, not proof.
Can this detect technologies behind a login wall?
Usually not. This tool requests the URL you supply as an anonymous client. If the server returns a login page, paywall, or interstitial, fingerprints reflect that surface—not the authenticated application behind it.
Does this work on SPAs and client-rendered sites?
Partially. You see whatever HTML the server returns on the first response. Pure client-rendered bundles may expose fewer strings until JavaScript runs in a real browser. For redirect and delivery issues, pair this scan with our redirect chain checker and response code checker.
How is this different from Wappalyzer or BuiltWith?
Those products maintain large proprietary databases and often use browser extensions or deeper crawling. This free tool uses a focused, transparent ruleset over one fetch—fast and privacy-conscious for quick competitive checks, but not a full replacement for paid reconnaissance platforms.
Will you store the URLs I scan?
The tool does not present a history of your past scans. Like most websites, hosting and network providers may log requests for reliability and abuse prevention according to their own policies.
What if the fetch fails or times out?
Some hosts block non-browser user agents, require specific cookies, or rate-limit datacenter IPs. Try again later, confirm the URL loads in your browser, and verify DNS with our DNS lookup tool if the hostname is new or recently changed.