What the audit covers

The Surfaceable SEO audit runs 12 independent checks across your site. Each check is a standalone module that fetches, analyses, and scores one dimension of your site's SEO health.

The 12 checks are:

Check	What it analyses
Page SEO	Title, meta description, headings, canonical, hreflang
Indexability	robots.txt, noindex tags, redirect chains, sitemap
Schema / Structured Data	JSON-LD presence, type detection, Schema.org validation
Content	Word count, readability score, keyword density, heading structure
Links	Internal/external link map, broken link detection
HTTP Headers	Cache-Control, compression, HSTS, response time
Social Meta	Open Graph tags, Twitter Card tags
Core Web Vitals	LCP, INP, CLS, TTFB via PageSpeed Insights API
Security	Mozilla Observatory grade, security header audit
DNS	A/AAAA records, SPF, DMARC, SSL certificate validity
HTML Validation	W3C HTML5 compliance
Accessibility	WCAG 2.1 AA: images, forms, viewport, lang attribute

Each check is documented in detail in The 12 SEO Checks Explained.

How scoring works

Every check returns a score from 0 to 100. The score is calculated by starting at 100 and deducting points based on issues found:

Critical issue — deducts 20 points each
Warning — deducts 10 points each
Info — no deduction (informational only)
Pass — confirms something is correct (no deduction)

The overall site score is the weighted average of all check scores across all crawled pages.

Severity levels

Severity	Meaning	Action
Critical	A definite problem that is likely harming rankings	Fix immediately
Warning	A potential issue or missed opportunity	Fix when possible
Info	Neutral data point — not good or bad	Awareness only
Pass	Check passed with no issues	Nothing to do

Crawl settings

By default an audit crawls up to 25 pages at a depth of 3 levels. On paid plans you can increase this up to 500 pages.

The crawler:

Follows canonical redirects
Respects robots.txt (and reports disallowed paths as an issue)
Uses a standard User-Agent string so it behaves like a real crawler
Captures both desktop and mobile signals where applicable