Website Score methodology: Category weights
The SiteIndex Website Score is a lightweight diagnostic of one public page and selected supporting resources. It is not a search ranking score, certification, or substitute for a full technical audit.
How the score works
SiteIndex checks one public HTML page, follows a limited redirect chain, and requests selected same-site robots.txt and sitemap resources. Passing checks receive full points, warnings receive partial credit, informational checks receive most points, and failed checks receive no points.
SEO
25%Page title, description, headings, canonical, social metadata, and structured data.
Technical health
25%HTTP response, robots.txt, sitemap availability, compression, and document size.
Security
20%HTTPS and a focused baseline set of response security headers.
Performance
20%Initial response timing, compression, and HTML document size.
Accessibility
10%Language, viewport, image alternative text, and link accessible names.
How check results become points
Checks contribute to their category as a proportion of the points available in that category. A typical 10-point check earns 10 points when it passes, 6 for a warning, 8 for an informational result, and 0 when it fails. The category score is rounded to a percentage, then the weighted category scores are combined and rounded for the overall result.
For example, the overall score gives SEO and technical health 25% each, security and performance 20% each, and accessibility 10%. A missing signal can be informational rather than a failure when it does not establish a definite problem. Read the finding itself and its recommendation before deciding what to change.
What the score does not measure
- It does not crawl an entire website or monitor uptime over time.
- It does not run a real-user or lab browser performance trace.
- It does not assess business relevance, content quality, conversion rate, or search rankings.
- Results can vary with server load, network conditions, redirects, and the page returned at analysis time.