Where the data is strong, where it is not, and what we cannot see at all.
Technology detection comes from HTTP Archive, which crawls sites in the Chrome UX Report monthly. That gives roughly 12.1M registrable domains. Our profiled set is the top 1,000,000 by CrUX rank, which is where our coverage is competitive.
Coverage. Vendors running their own crawler index more sites. We hold 46–65% of BuiltWith's top-1M counts on the technologies we have compared.
Freshness. Monthly crawl, published 4–6 weeks after the month it covers.
Large organisations. Coverage falls sharply at the very top: enterprises run marketing and commerce stacks on subdomains that a homepage crawl never sees. This data is strongest in the mid-market.
Contact data. We do not source contacts. We verify addresses you already have.
Contact fields come from each prospect's own structured data and are sparse. Measured, current:
Databases, warehouses and server-side infrastructure — anything invisible to a rendered page. Sites below the CrUX inclusion threshold. Technology on subdomains and behind logins. Multi-tenant registrable domains are flagged and excluded, because their merged stack belongs to nobody.