Leak glossary
What each leak-scan check actually means
These pages mirror the scanner’s check catalog. Every check shown in a report has an explainer here.
These pages explain what each scan check measures. They are not legal advice or a compliance verdict.
Run a free leak scanBrowse by category
Page speed
- PageSpeed performance (mobile)A-psi
- PageSpeed performance (desktop)A-psi-desk
- Largest Contentful Paint (mobile lab)A-lcp
- Largest Contentful Paint (desktop lab)A-lcp-desk
- Cumulative Layout Shift (mobile lab)A-cls
- Chrome UX Report field data (real users)A-cwv-field
- Server TTFB (bot first byte)A2
- Full page load time (bot)A1
- Third-party script weightA11
Lead forms
Ad tracking
- Google tag stack (GTM / GA4)C4a
- Meta Pixel signatureC8
- Other ad/analytics tagsC-tools
- Landing URL accepts UTM query paramsC1
- UTM survives browse + form journeyC2
- UTMs / click IDs in cookies or web storageC3
- localStorage attribution keysC3b
- Attribution cookies, including HttpOnly cookiesC3c
- Cache / CDN query-string friendliness (headers)C14
- Thank-you page for conversion trackingC16
- UTM Grabber / HandL signature on pageC-handl
- Attribution fields after navigationC15
Site basics
Search visibility
- Indexable (no noindex)E-index
- Document title qualityE-title
- Meta descriptionE-desc
- H1 structureE-h1
- Canonical URLE-canon
- Structured data (JSON-LD)E-schema
- Open Graph / social previewE-social
- robots.txt reachableE-robots
- XML sitemapE-sitemap
- Lighthouse SEO score (PageSpeed mobile)E-psi-seo
- Google index sample (site: query via SerpAPI)E-serp
- Keyword ranking positionsE-rank-note