Tool category
Schema
Structured-data generators and validators for expressing entities and facts in machine-readable form.
6 tools · 4 free or with a free tier · 8 more cover this area as a secondary feature
| Tool | What it does | Pricing | From | HQ |
|---|---|---|---|---|
| Classy Schema classyschema.org | Free structured data viewer that renders a page's schema markup as an interactive graph for debugging entity relationships. | Free | — | — |
| Google Rich Results Test search.google.com | Google's free tool for checking whether a page's structured data is eligible for rich results, with rendered HTML inspection and error reporting. | Free | — | United States |
| Merkle Schema Markup Generator technicalseo.com | Free web tool that produces JSON-LD structured data snippets for common schema types such as Article, Local Business, FAQ and Product. | Free | — | United States |
| Schema AppAI schemaapp.com | Enterprise structured data platform for authoring, deploying and maintaining schema markup and a connected content knowledge graph across large sites. | Enterprise | — | Canada |
| Schema Markup Validator validator.schema.org | Validator hosted by Schema.org that checks structured data syntax and vocabulary conformance independently of any single search engine's requirements. | Free | — | — |
| WordLiftAI wordlift.io | Knowledge graph and structured data platform that adds semantic markup and entity linking to websites, with AI agents for content and AI search visibility. | Paid | $879 | Italy |
1 of 6 vendors in this category publish a starting price. Where the column is empty, the vendor quotes on request or the price was not published at the time of compilation.
Also covers schema
These tools are catalogued under another primary category but include schema functionality.
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