Free tools
Structured data tools
Honest, limited utilities that mirror EntityStacks production behavior. Create a workspace when you need crawl-backed inventory, versioning, and monitoring.
Schema validator
Paste JSON-LD and run deterministic validation layers in the browser.
Schema detector
Fetch a public URL and detect JSON-LD, Microdata, and RDFa types.
Schema generator
Build a connected sample JSON-LD graph with the production schema engine.
Domain health checker
Quick homepage structured-data and technical snapshot for any domain.