How to Detect a Website's Tech Stack in Bulk in 2026

Knowing what technology a company runs is one of the most valuable signals in B2B sales. If you sell a Shopify app, a list of confirmed Shopify stores is a target account list. If you replace a particular analytics tool, the sites running that tool are your best prospects. BuiltWith pioneered this “technographics” category — but it’s expensive and opaque. The underlying technique is just fingerprinting, and you can run it in bulk over your own domain list. This guide covers what signals reveal a tech stack, how the detection works, and the per-domain economics.

What a tech stack fingerprint reveals

For each domain, the detector returns a categorized list of technologies. The categories that matter for prospecting and intel:

• CMS / site platform — WordPress, Shopify, Wix, Squarespace, Webflow, Drupal.
• E-commerce systems — Shopify, WooCommerce, Magento, BigCommerce.
• JavaScript frameworks — React, Vue, Next.js, Angular.
• Analytics — Google Analytics, Plausible, Segment, Mixpanel.
• Marketing / CRM — HubSpot, Marketo, Klaviyo, Intercom.
• Payments — Stripe, PayPal, Adyen.
• CDN / hosting — Cloudflare, Fastly, Vercel, AWS.
• Web server — nginx, Apache, LiteSpeed.

Each result is per-domain and includes the page/response metadata, the categorized technology lists, and a count of technologies detected. That structure is what lets you filter a list down to, say, “Shopify stores also running Klaviyo” — a precise outreach segment.

How the fingerprinting works

The detector doesn’t need to render the page or log in. It fetches the site and inspects three layers of evidence:

• HTTP response headers. Server: nginx, X-Powered-By: PHP, X-Shopify-Stage, CDN headers from Cloudflare or Fastly — platforms leak themselves here constantly.
• Cookies. Session cookie names are dead giveaways: wordpress_logged_in, _shopify_*, framework-specific session cookies.
• HTML markup. <meta name="generator"> tags, characteristic script URLs (a cdn.shopify.com script, a wp-content/ path, a gtag.js snippet), and framework-specific DOM signatures.

Detection is a set of precision-tuned patterns matched against those three layers. The work is parallelized over HTTP — domains in, tech stacks out — so a list of thousands of domains processes quickly. It’s the same idea as BuiltWith or Wappalyzer, run as a batch job you control.

▶ Run the Website Tech Stack Detector — feed it a list of domains and get back the CMS, frameworks, analytics, marketing/CRM, payments, CDN and hosting behind each. BuiltWith-style fingerprinting, in bulk.

Output schema

{
  "domain": "example-store.com",
  "url": "https://example-store.com",
  "status": 200,
  "technologies": {
    "cms": ["Shopify"],
    "ecommerce": ["Shopify"],
    "js_frameworks": ["React"],
    "analytics": ["Google Analytics"],
    "marketing_crm": ["Klaviyo"],
    "payments": ["Shopify Payments"],
    "cdn_hosting": ["Cloudflare"],
    "web_server": ["nginx"]
  },
  "technology_count": 8,
  "detected_at": "2026-05-29T13:00:00Z"
}

For lead-gen, the categorized object is the payload. You append it to each CRM record and filter on technology combinations to build segments.

Use cases

• B2B prospecting by technology combination. “Shopify + Klaviyo” or “WordPress + WooCommerce” defines a precise ICP you can target with relevant messaging.
• Find all Shopify stores (or any platform’s adopters) in a niche or geography for app/plugin outreach.
• Competitive intelligence. Profile competitors’ stacks — and, by enriching their customer domains, map their customer base.
• Sites missing a tool you sell. The inverse signal is just as valuable: domains with no analytics, or no CRM, are upsell targets.
• Lead enrichment. Append technographic signals to existing CRM records so reps open with relevant context instead of cold guesses.
• Market research. Measure technology adoption across an industry or region.
• Recruiting / sourcing. Find companies running a specific stack relevant to a hiring brief.

Cost math

Pay-per-event, small per-run start fee, zero per result, one row per domain. This actor is high-volume on the input side — you feed it a large domain list rather than crawling one site deep.

• 50,000 domains in, 50,000 enriched rows out.
• One run, results free.
• Cost is the Actor start plus HTTP compute for the fetches.

Compare that to BuiltWith’s per-lookup or subscription pricing and the difference at scale is the entire point. A 50,000-domain technographic enrichment that would be a meaningful line item on a SaaS technographics bill is, here, essentially the cost of compute. Bulk fingerprinting being effectively free per result is what makes whole-market enrichment practical.

Common pitfalls

• Obfuscated / proxied stacks. A site fully behind Cloudflare with stripped headers reveals less. Detection then leans on HTML signatures, which catch most but not all platforms.
• Tag managers hide tools. Google Tag Manager can load analytics and marketing tools client-side without those tools appearing in the initial HTML. HTTP-level detection may miss tools injected only by GTM at runtime.
• Version precision. Detection identifies that a platform is present, not always its exact version. Don’t promise version-level data you can’t see.
• False positives from shared libraries. A site embedding a third-party widget might show that widget’s vendor as a “technology.” Sanity-check segments before launching outreach.
• Compliance for outreach. A list of confirmed-stack domains is a prospecting list, not a license to spam. Respect anti-spam rules wherever you operate.

Wrapping up

Technographics is one of the highest-signal inputs to B2B targeting, and the fingerprinting behind it is straightforward enough to run in bulk over your own list. Feed in domains, get back categorized stacks, filter to your exact ICP. With free per-result pricing, enriching a 50,000-domain market costs about the same as enriching ten — so build the whole segment, not a sample.

▶ Open the Website Tech Stack Detector on Apify — bulk CMS, framework, analytics and hosting detection. Domains in, tech stack out. Start with Apify’s free monthly credit.