SEO health is a 0–100 score Crawlinx computes from 157 technical checks run on every crawled page — indexability, titles and meta descriptions, canonical and hreflang correctness, internal linking, redirects, broken links and Core Web Vitals signals. A site scores high only when the whole crawl is clean, so a single median hides a spread worth reading below.
Across 607 blog sites the median SEO health is 65, with the middle half falling between 65 (25th percentile) and 66 (75th percentile). The full range runs from 33 to 93. That wide gap says the segment is not uniformly good or bad — platform defaults set a baseline, but individual configuration decides where a site lands. Compare your own score against the 75th percentile, not the median, to see what a well-run peer looks like.
These are all blog sites, so they face similar content and crawl patterns — comparable page depth, similar templating and often the same third-party scripts. Treat the median as the bar to clear for a blog site and the issues below as the technical debt typical of the vertical.
The single most common problem here is “Missing recommended security headers”, present on 93% of the sample, followed by “Heading levels skip a level” and “Legacy image format (jpg/png/gif) with no next-gen fallback”. The full ranking is in the table above — fix the top of that list first, since it is the fault most likely to be dragging this segment's median down.