Actavero

Methodology · Website

How the Site health score is calculated

Method version site-health-score-v1 · Last updated

In short

The Site health score rates a website's technical and content quality from 0 to 100. Actavero crawls up to 200 pages, runs 45 checks on crawlability, on-page content, internal linking, markup, internationalisation and security, and scores each category by how often its checks fail, weighted by severity. The overall score is the mean of the category scores.

Formula

Fail rate of a check = pages failing ÷ pages the check applies to
Category score = 100 × (1 − Σ (weight × fail rate) ÷ Σ weight)
Weights: error 3, warning 2, notice 1
Site health score = mean of the category scores that have applicable checks

How it is calculated, step by step

  1. Crawl the site from its homepage and sitemap, up to 200 pages, rendering pages that need JavaScript.
  2. Run each check on every page it applies to (e.g. title length, broken links, canonical tags, structured data, hreflang, HTTPS).
  3. Compute each check's fail rate and weight it by severity.
  4. Score each of the six categories and average them into the Site health score.

What goes into it

Crawled pages
Up to 200 pages per site, the same budget for every brand.
Checks
45 checks, each with a category and a severity (error, warning or notice).
Link-graph coverage
Checks that need the whole link graph (e.g. orphan pages) only count when enough of the site was crawled.

Data sources

  • Actavero's own crawler (HTML fetch, rendered when needed)
  • robots.txt and XML sitemaps of the site

How often it is updated

Monthly on the 1st, and on demand within the plan's re-tests.

How to read it

  • The category breakdown shows where points are lost; the biggest losses are listed first.
  • Gaps compare your pass rate per check with your competitors', so you see what they do better.
  • Scores are only comparable within the same formula version (shown on the label).

Example

A category with one error-level check failing on 50% of pages and one notice-level check passing everywhere scores 100 × (1 − (3 × 0.5 + 1 × 0) ÷ 4) = 63.

Limitations

  • A sample of up to 200 pages, not the full site.
  • Sites that refuse automated requests are reported as blocked and not scored, instead of being given a misleading low score.

Frequently asked questions

Why is a blocked site not scored?

When a site refuses our requests we only see its block page; scoring that would be unfair and misleading, so we report the block instead.

Do all checks count equally?

No. Errors weigh three times as much as notices, warnings twice.

  • Website score — Google Lighthouse performance (0–100) of the homepage and up to four representative pages, weighted: homepage 40%, the other pages share 60%.
  • AI readiness score — How well AI assistants can reach and use a site: 60% bot access, 30% content readiness (assessed by Claude), 10% llms.txt.

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