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DetectZeStack

Detect any website's tech stack with a single API call

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DetectZeStack is a REST API that identifies what technologies any website uses. Give it a URL and get back the full stack โ€” frameworks, CMS, CDNs, analytics, payment processors, and more. It combines 4 detection methods simultaneously: Wappalyzer fingerprinting (3,500+ signatures), DNS CNAME analysis, TLS certificate inspection, and HTTP header matching. Free tier: 100 requests/month.
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What does DetectZeStack help with?

Why I built it: I needed tech stack data for a lead enrichment pipeline. BuiltWith charges $295/month minimum. Wappalyzer's API only does HTML-level detection, missing infrastructure tech.

Key features:

  • Batch analysis: up to 10 URLs per request
  • Stack comparison: see shared vs unique technologies across sites
  • CPE identifiers for NVD vulnerability mapping
  • 24-hour smart cache: cached responses are free and return in <5ms
  • Webhook alerts with HMAC-signed payloads

Tech stack: Go, chi router, SQLite, wappalyzergo. Runs on a single Fly.io machine.

Pricing: Free (100 req/mo), Basic $9.99 (5K), Pro $29.99 (25K), Business $99.99 (100K). Significantly cheaper than BuiltWith ($295/mo minimum).

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