Website Technology Stack Detector – BuiltWith / Wappalyzer alternative

Find out what any website is built with. Paste a list of domains and get the CMS, e-commerce platform, JavaScript frameworks, analytics and advertising tags, tag managers, payment processors, CDN, hosting, web server, programming language, email provider, security and compliance tools – matched against 7,500+ technology fingerprints with versions and confidence scores.

Built for bulk: analyze thousands of domains in one run for $2 per 1,000 websites. No browser needed – fast HTTP + DNS analysis.

What you get per website

{
  "url": "allbirds.com",
  "finalUrl": "https://www.allbirds.com/",
  "title": "Allbirds: Comfortable, Sustainable Shoes & Apparel",
  "technologyCount": 12,
  "technologyNames": ["Shopify", "Cloudflare", "Google Tag Manager", "Apple Pay", "PayPal", "Swiper", "web-vitals", "HTTP/3", "HSTS", "Open Graph", "Priority Hints", "Microsoft 365"],
  "technologies": [
    { "name": "Shopify", "categories": ["Ecommerce"], "version": null, "confidence": 100, "website": "https://shopify.com", "icon": "…/Shopify.svg", "saas": true, "evidence": ["scriptSrc", "meta"] },
    { "name": "Cloudflare", "categories": ["CDN"], "confidence": 100, "evidence": ["headers"] }
  ],
  "summary": {
    "cms": null, "ecommerce": "Shopify", "framework": null, "programmingLanguage": null,
    "webServer": null, "cdn": "Cloudflare", "hosting": null,
    "analytics": [], "advertising": [], "tagManager": "Google Tag Manager",
    "payments": ["Apple Pay", "PayPal"], "emailProvider": "Microsoft 365",
    "security": ["HSTS"], "cookieCompliance": null, "liveChat": null, "crm": null
  },
  "saasServicesFromDns": ["DocuSign", "Miro", "Cursor", "Apple iCloud Mail"],
  "categories": { "Ecommerce": ["Shopify"], "CDN": ["Cloudflare"], "Payment processors": ["Apple Pay", "PayPal"] },
  "dns": { "mx": ["allbirds-com.mail.protection.outlook.com"], "ns": ["…"], "txt": ["v=spf1 …"] },
  "headers": { "server": "cloudflare", "x-powered-by": null }
}

• technologies – every detected technology with categories, version (when exposed), confidence (0-100), vendor website, icon URL, SaaS/open-source flags, pricing hints and the evidence that triggered the match (headers, cookies, meta, HTML, script URLs, script code, DOM, DNS).
• summary – the most useful facts pre-selected: CMS, e-commerce platform, framework, language, server, CDN, hosting, analytics, ads, tag manager, payments, email provider, CRM, live chat, cookie banner, A/B testing.
• saasServicesFromDns – SaaS tools the company verified on its domain (DNS TXT records): Google Workspace, Microsoft 365, HubSpot, Atlassian, Notion, Zoom, DocuSign, Canva … great for sales intelligence.
• categories – technologies grouped by category name.

Use cases

• Lead generation & sales intelligence – find companies using Shopify, WooCommerce, HubSpot, Salesforce, Klaviyo, Intercom, …; build lists by technology.
• Competitive & market research – technology market share across your industry.
• Agency prospecting – spot outdated CMS versions, missing analytics, no cookie banner, no CDN.
• Website audits / due diligence – inventory of third-party scripts, trackers and vendors.
• Enrichment – enrich CRM or scraped domain lists with tech stack data.

Input

Field	Description
urls	Domains or URLs, one per line.
maxExternalScripts	How many external JavaScript files to download per site for deeper detection (default 10).
fetchDns	Resolve MX/NS/TXT/CNAME to detect email/DNS providers and verified SaaS services (default on).
minConfidence	Minimum confidence to report (default 50).
includeDescriptions	Add a description for each technology.
concurrency	Parallel websites (default 10).
proxyConfiguration	Optional proxies (use if target sites block datacenter IPs).

How it works & limitations

The detector downloads the HTML, HTTP headers, cookies and a sample of JavaScript files of each site and resolves its DNS records, then matches them against the open-source fingerprint database maintained by the community (webappanalyzer, the continuation of the Wappalyzer rules). Technologies that only reveal themselves through JavaScript runtime globals are detected heuristically from script code with reduced confidence. Single-page apps that render everything client-side may show fewer technologies than a browser-based analysis.

Pricing

$0.002 per website analyzed ($2 per 1,000). Failed/unreachable sites are not charged.

Integrations

Run on a schedule, via API or SDK, export to JSON/CSV/Excel, or pipe into Google Sheets, Airtable, HubSpot, Make, Zapier or n8n. Available as an MCP tool for AI agents.

License

This actor's source is licensed under GPL-3.0; it includes the webappanalyzer fingerprint database (GPL-3.0).

Ready-made examples

One click, input already filled in:

• Find out what a website is built with
• Check which websites run on Shopify
• Enrich a lead list with each company's tech stack
• Detect the CMS of a list of websites
• See which analytics and ad tags a website uses

FAQ

How is this different from BuiltWith or Wappalyzer?

Same idea – technology fingerprints from HTML, scripts, headers, cookies and DNS – but pay-as-you-go from $1 per 1,000 sites, no subscription, and you get raw JSON you can pipe anywhere.

How many technologies are detected?

About 7,500 fingerprints across CMS, ecommerce, frameworks, analytics, ads, tag managers, payments, CDN, hosting, email and more, with versions where a site exposes them.

Does it work on JavaScript-heavy sites?

Yes. It fetches the page plus the external scripts it loads (maxExternalScripts) so client-side frameworks and tags are found too.

What is the confidence score?

Each fingerprint carries a confidence (0–100). Use minConfidence to hide weak matches such as a lone cookie name.

Can I run thousands of domains?

Yes – paste a list or attach a file; concurrency controls parallelism. 1,000 domains cost about $1.

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