Homepage schema markup adoption among SEO-industry sites

An earlier count we made of our own pages using a text pattern undercounted Organization markup, because it missed pretty-printed and nested blocks. For this study we parsed every JSON-LD block as JSON and walked @graph arrays and nested entities such as publisher and offers. Five homepages had blocks that failed to parse, which means search engines would also struggle to read them.

Organization and WebSite markup, the two types most guides recommend for a homepage, appeared on roughly six in ten homepages each. Many sites generate these through SEO plugins or site builders, which explains their consistency. 147 homepages had no JSON-LD in the raw HTML at all; some of those may add it with JavaScript after load, which this method cannot see.

FAQPage on 18 percent of homepages suggests many sites still add it expecting expandable FAQ results, which most sites have not received since 2023. BreadcrumbList on 24 percent of homepages is also unusual, since a homepage is the root of its own trail. Neither is harmful when accurate, but both indicate markup added by default rather than by need.

WebPage markup on 39 percent of homepages is mostly generated by SEO plugins and is harmless. The more useful check for any site is consistency: the same Organization name, logo, and profile links on the homepage as on the About page and in social profiles, since mismatches weaken the entity signals the markup is meant to provide.

SoftwareApplication appeared on 93 homepages, and Offer and AggregateOffer entities, usually describing pricing, on 80 and 24. LocalBusiness and ProfessionalService appeared on 39 and 34 homepages. On serionflow.com, Organization, WebSite, and SoftwareApplication are declared once in the shared document head, and page-level types reference them by @id.

Pricing in markup deserves care. If a homepage declares an Offer with a price, that price must match the visible pricing page and change with it, or the structured data becomes a source of outdated facts for search engines and AI answers.

We measured only the homepage and only the raw server HTML, so markup injected by JavaScript is missed. Presence does not mean validity against Google's requirements; we only checked that JSON parsed. The sample is SEO-industry sites. Our free schema builder and validator checks a single live page against common requirements. SerionFlow is the wrong tool for auditing structured data across many sites; this was a one-off study, and a crawler suits ongoing checks.