Website Tech Stack Detector - CMS, Analytics & Email

Website Tech Stack Detector - CMS, Analytics, Ecommerce & Email Provider

Find out what any website is built with: CMS, ecommerce platform, JavaScript framework, analytics, ad pixels, tag manager, CDN, hosting, payment, chat widget, consent banner and more, from one page fetch per site. It also reads the domain's DNS: MX, SPF, TXT, NS and CNAME records reveal the email provider (Google Workspace, Microsoft 365, Zoho...), email senders (SendGrid, Mailchimp, HubSpot, Salesforce, Amazon SES...), the DNS host and the SaaS tools the company verified its domain with (Atlassian, DocuSign, Zoom, Slack...). HTML-only detectors miss all of that, and it's what B2B sales teams filter on ("companies on Microsoft 365 using HubSpot"). Every detection comes with a version (when visible), a confidence score and the evidence behind it. One flat price per website, no start fee, and websites that fail or block us are free. Other tech-stack Actors charge per technology row ($0.10-$0.30 per site) or add a start fee. A monitoring mode outputs only the sites whose stack changed since the last run, with added / removed lists.

What data can you get?

Field	Example
domain, url, title, language, statusCode	stripe.com, https://stripe.com/en-de, Stripe | Financial Infrastructure..., en-DE, 200
cms, ecommerce, framework	WordPress, Shopify, Next.js
analytics[]	["Google Analytics", "Hotjar"]
emailProvider, mxHosts[]	Google Workspace, ["aspmx.l.google.com", ...]
cdn, hosting, nameservers[]	Cloudflare, Vercel, ["ns1.vercel-dns.com", ...]
categories{}	{ "emailDelivery": ["SendGrid", "Postmark"], "marketingAutomation": ["HubSpot"], ... }
technologies[]	{ "name": "WordPress", "category": "cms", "version": "6.9.11", "confidence": 100, "evidence": "meta generator" }
technologyCount	28
status, error	ok / blocked / failed, and why
added[], removed[], previousCheckAt	monitoring mode only

490+ technologies in 36 categories: CMS and site builders, ecommerce, JS frameworks and libraries, UI frameworks, static site generators, backend frameworks and languages, web servers, CDN, hosting/PaaS, analytics and session replay, tag managers, advertising pixels, marketing automation and CRM, chat and helpdesk, A/B testing, consent banners, payments and BNPL, reviews, search, fonts, video, maps, forms, scheduling, accessibility, bot protection, monitoring, email provider, email security gateway, email delivery (ESP), DNS provider, plus 120+ named SaaS vendors (and any other "vendor-domain-verification" record) from DNS TXT records. The signature set is our own, written from vendor documentation and real pages.

Use cases

• Sales prospecting: build lead lists by technology ("SaaS companies on Microsoft 365 with HubSpot", "WordPress sites without a consent banner"). Platforms that sit behind bot walls, like many Shopify stores, are still identified from the challenge page, CNAME and SPF records, and those rows are free.
• Agencies: qualify prospects before a pitch (outdated WordPress, no analytics, no consent banner).
• Competitive intelligence: see which analytics, A/B testing, chat and payment tools competitors run.
• Market research: measure CMS or framework share across a list of domains.
• Monitoring: schedule it weekly with "Only changes" and get alerted when a customer or competitor adds or drops a tool.
• Data enrichment: add email provider, CDN and hosting to a CRM's company records.

How to use

1. Paste websites or domains into Websites / domains (stripe.com or https://www.stripe.com/pricing both work).
2. Keep Check DNS on (it's free and gives the email/SaaS data).
3. Run it and download the dataset as JSON, CSV or Excel. The Overview view shows one row per site, Email & DNS is built for B2B targeting.

Basic:

{
    "urls": ["https://wordpress.org", "https://www.python.org", "https://stripe.com", "https://github.com", "https://apify.com"],
    "checkDns": true
}

Weekly monitoring of competitors (only changed stacks are output and charged):

{
    "urls": ["notion.so", "linear.app", "www.figma.com", "airtable.com", "asana.com"],
    "onlyChanges": true,
    "stateKey": "competitors"
}

Output example

Real item (technologies list shortened):

{
  "id": "python.org",
  "domain": "python.org",
  "inputUrl": "https://www.python.org",
  "url": "https://www.python.org/",
  "status": "ok",
  "statusCode": 200,
  "title": "Welcome to Python.org",
  "language": "en",
  "technologyCount": 18,
  "cms": null,
  "ecommerce": null,
  "framework": null,
  "emailProvider": "Google Workspace",
  "cdn": "Fastly",
  "hosting": null,
  "analytics": [],
  "categories": {
    "jsLibrary": ["jQuery", "jQuery UI", "Modernizr"],
    "cdn": ["Fastly"],
    "libraryCdn": ["Google Hosted Libraries"],
    "webServer": ["Nginx", "Varnish"],
    "emailProvider": ["Google Workspace"],
    "emailDelivery": ["Mailgun"],
    "dnsProvider": ["Amazon Route 53"],
    "security": ["HSTS"],
    "siteVerification": ["Anthropic", "Atlassian Statuspage", "GlobalSign", "Google Search Console", "Microsoft 365", "OpenAI", "Twilio"]
  },
  "technologies": [
    { "name": "jQuery", "category": "jsLibrary", "version": "1.8.2", "confidence": 100, "evidence": "script src" },
    { "name": "jQuery UI", "category": "jsLibrary", "version": "1.12.1", "confidence": 100, "evidence": "script src" },
    { "name": "Fastly", "category": "cdn", "version": null, "confidence": 100, "evidence": "header x-served-by; CNAME www" },
    { "name": "Mailgun", "category": "emailDelivery", "version": null, "confidence": 80, "evidence": "SPF include" }
  ],
  "mxHosts": ["mail.python.org"],
  "nameservers": ["ns-1134.awsdns-13.org", "ns-2046.awsdns-63.co.uk", "ns-484.awsdns-60.com", "ns-981.awsdns-58.net"],
  "dnsStatus": "ok",
  "added": null,
  "removed": null,
  "previousCheckAt": null,
  "error": null,
  "scrapedAt": "2026-11-08T12:38:57.632Z"
}

Confidence: 100 = direct evidence (header, cookie, meta tag, script URL, MX/NS/CNAME record), 80 = SPF include or TXT record, 75 = pattern in the HTML, 60 = domain-verification record, 50 = implied by another technology (WooCommerce implies WordPress, Next.js implies React).

Pricing

Pay per event, no start fee:

Event	Price	When
website	$0.003	per website successfully analysed

• 1,000 websites ≈ $3.00, 100 websites ≈ $0.30.
• Websites that fail (DNS error, timeout, HTTP error) or block us with a bot wall are output with status and error set and are not charged.
• In "Only changes" mode, unchanged websites are not output and not charged.
• Set "Maximum cost per run" and the Actor stops cleanly when it's reached.

Tips and limits

• One page per site (the URL you give, after up to 5 redirects; 20 s timeout, first 2 MB of HTML). Tools that are loaded later by Google Tag Manager or only on other pages (checkout, blog) are not visible. Give the exact page if it matters (e.g. shop.example.com).
• Bot walls: many Shopify stores and Cloudflare/DataDome/Vercel-protected sites answer automated requests with a challenge page. Those items get status: "blocked", are free, and still list what the response headers and DNS reveal (often the platform itself, e.g. Shopify, plus the email provider). A datacenter proxy rarely gets past these walls.
• DNS is queried for the domain without www.. If you give a subdomain (blog.example.com), MX/SPF/NS come from that subdomain, so the email provider may be missing; give the main domain for email data.
• SPF includes are read at the top level only (nested includes are not followed).
• Domain-verification records (siteVerification category) show tools the company signed up for at some point; they may be stale.
• Default limit: 1,000 websites per run (maxItems, 0 = no limit). Five sites are fetched in parallel; ~1,000 sites take a few minutes.

FAQ

Is it legal? It reads public web pages and public DNS records, the same data any browser or dig shows. It doesn't log in, solve captchas or collect personal data. You are responsible for using the results in line with the laws and terms that apply to you.

How is this different from BuiltWith or Wappalyzer? BuiltWith sells a historical database; this Actor checks the live site now. Compared with Wappalyzer-style detectors, it adds DNS: email provider, email security gateway, email senders, DNS host and verified SaaS vendors, which a page fetch can't see.

Why does a site show blocked? The site returned a bot challenge or HTTP 401/403/429 to our server. You aren't charged; DNS and header-based detections are still included.

Do I need a proxy? Usually not. If many of your sites return 403/429, enable Apify Proxy (datacenter). Residential proxies are not supported: if you pick the RESIDENTIAL group, the Actor logs a warning and uses Apify datacenter proxy instead.

How does "Only changes" work? The Actor stores each domain's technology names in a named key-value store (stateStoreName / stateKey). On the next run it outputs only websites whose set changed, with added and removed. The first run outputs every website. Failed or blocked runs don't overwrite the stored stack.

Can I check thousands of sites? Yes. Set maxItems to 0 or a higher number. A run of 10,000 sites costs about $30.

Integrations

• API: run it and get the items in one call:

  curl -X POST "https://api.apify.com/v2/acts/rjmacarthy~tech-stack-detector/run-sync-get-dataset-items?token=YOUR_TOKEN" \
    -H "Content-Type: application/json" \
    -d '{"urls":["stripe.com","github.com"],"checkDns":true}'
  

• Schedules and webhooks: run weekly with onlyChanges and send changed stacks to your pipeline when the run finishes.

• Make, Zapier, n8n: enrich leads in Google Sheets, HubSpot, Airtable or Slack without code.

• AI agents (MCP): use the Actor as a tool through the Apify MCP server.

• Python and JavaScript clients (apify-client) for programmatic runs.

Changelog

• 0.1 (Nov 2026): first release. 490+ technologies, DNS-based email provider / ESP / DNS host / verified SaaS detection, CNAME-based platform detection, versions, confidence and evidence per detection, bot-wall detection (free), only-changes monitoring.

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Browse all my Actors on my Apify Store profile.

Support

Found a wrong or missing detection? Open an issue on the Actor's Issues tab with the website and the technology. New signatures are added regularly.