Tech Stack Detector - Wappalyzer & BuiltWith Alternative

What does Tech Stack Detector do?

Tech Stack Detector tells you what any website is built with. Give it a list of domains and it returns the CMS, ecommerce platform, JavaScript frameworks, analytics and marketing tools, CDN, hosting, web server, email provider and more, drawn from 7,600+ technology fingerprints (the open-source Wappalyzer successor database).

It's a bulk, API-friendly alternative to Wappalyzer and BuiltWith lookups: $5 per 1,000 websites, no subscription, no browser extension, no API key to manage.

What you get for each website

• Technologies with name, version when it can be read (e.g. WordPress 7.2, Gutenberg 24.0.0), categories, confidence, official website and CPE identifier
• Evidence for every detection (HTML, script URL, header, cookie, meta tag, DOM, DNS) so you can see why it was flagged
• By category summary: CMS, Ecommerce, Analytics, Tag managers, CDN, Web servers, Email, and 100+ more
• Email provider read from MX records: Google Workspace, Microsoft 365, Proofpoint, Mimecast, Zoho, Tencent Exmail and more
• Company SaaS footprint (companySaas): tools the company has verified its domain with, found in DNS TXT records, such as Atlassian, DocuSign, Zoom, Miro, Slack, HubSpot, Adobe and Stripe. Useful for sales targeting, and kept separate from the website's own stack
• Page title, meta description, final URL after redirects, HTTP status, server header, response time

Use cases

• Sales prospecting and lead qualification: find every Shopify or WooCommerce store in a list, or every company on HubSpot vs Salesforce
• Competitor research: see which analytics, A/B testing, chat and ad tools competitors run
• Market sizing: count how many sites in a list use a given CMS or framework
• Security and IT audits: inventory software and versions (with CPE) across your own domains
• Agencies: qualify leads before pitching a migration or redesign

How to use it

1. Paste domains or URLs into Websites (one per line). example.com is fine.
2. Keep Check DNS records on for email and SaaS detection.
3. Click Start. Download results as JSON, CSV or Excel, or call the Actor via API, Make, Zapier or n8n.

Input example

{
  "urls": ["wordpress.org", "https://www.shopify.com", "https://www.bbc.com"],
  "checkDns": true
}

Output example

{
  "url": "https://wordpress.org",
  "finalUrl": "https://wordpress.org/",
  "domain": "wordpress.org",
  "statusCode": 200,
  "title": "Blog Tool, Publishing Platform, and CMS – WordPress.org",
  "technologyCount": 13,
  "technologies": [
    {
      "name": "WordPress",
      "version": "7.2",
      "confidence": 100,
      "categories": ["CMS", "Blogs"],
      "website": "https://wordpress.org",
      "cpe": "cpe:2.3:a:wordpress:wordpress:*:*:*:*:*:*:*:*",
      "oss": true,
      "implied": false,
      "evidence": ["html", "script", "inlineScript", "header", "meta", "dom"]
    }
  ],
  "byCategory": {
    "CMS": ["WordPress"],
    "Web servers": ["Nginx"],
    "Programming languages": ["PHP"],
    "Databases": ["MySQL"],
    "Tag managers": ["Google Tag Manager"]
  },
  "companySaas": [
    { "name": "Atlassian Cloud", "categories": ["Issue trackers"], "website": "https://www.atlassian.com" }
  ],
  "emailProvider": "Google Workspace",
  "blocked": false,
  "server": "nginx",
  "error": null
}

How much does it cost?

$5 per 1,000 websites analyzed ($0.005 each). Sites that fail to load (DNS errors, timeouts, blocked pages with nothing detected) are not charged; they are listed in the FAILED_URLS record of the run's key-value store.

Accuracy and limits

• Detection works on the page HTML, response headers, cookies, scripts and DNS, without running a full browser. That makes it fast and cheap. Technologies that only reveal themselves through JavaScript executed after page load may be missed.
• Some sites block automated requests (blocked: true). If DNS still reveals the email provider or SaaS tools you get those; if nothing at all is found the site is reported as failed and not charged.
• implied: true means the technology was inferred from another one (for example WordPress implies PHP).

Credits

Fingerprints come from the open-source webappanalyzer project (GPL-3.0).

Feedback

Missing a technology or seeing a false positive? Open an issue on the Issues tab with the URL.