Engine · Signals

Every page. Every crawl.

The crawler visits every page with a full browser — not a sampler, not a bot that guesses. 200+ signals extracted per page, per run. Nothing skipped.

SEO

  • · Title, meta description, canonical URL
  • · H1–H6 structure and hierarchy
  • · Robots directives and indexability
  • · hreflang and international targeting
  • · OpenGraph and social metadata
  • · JSON-LD structured data validation
  • · 18+ violation types with severity classification

Security

  • · HSTS enforcement
  • · Content Security Policy — full directive parsing and scoring
  • · X-Frame-Options and clickjacking protection
  • · XSS and mixed content detection
  • · CORS misconfiguration
  • · Stack header leaks
  • · Inline script inventory

Performance

  • · Page weight breakdown — HTML, images, scripts, styles, fonts
  • · Simulated load times across four network profiles
  • · TTFB, FCP, and LCP estimates
  • · INP and CLS risk analysis
  • · CrUX integration — real Chrome User Experience data
  • · Image optimization detection

Accessibility

  • · 86 WCAG rules via fast-a11y
  • · Score 0–100 per page
  • · axe-core compatible — zero-DOM parsing
  • · Tracked across every crawl run

Link Structure

  • · Full outbound link graph per page
  • · Inbound link calculation across the entire site
  • · Page value scoring — depth, inbound count, title quality
  • · Orphaned page detection
  • · Sitemap gap analysis — pages that exist but aren't declared