REST API that identifies what technologies any website uses. Pass a URL, get back the full stack — frameworks, CMS, CDNs, analytics, and more. 4 detection methods in a single call: Wappalyzer fingerprinting (3,500+ signatures), DNS CNAME analysis, TLS certificate inspection, and HTTP header matching. Batch analysis (10 URLs), stack comparison, CPE identifiers for vulnerability mapping, and 24h smart cache. Free tier: 100 req/month.