Schema.biz vs Schema.dev

Schema.biz is a free browser toolkit for structured data markup, database schemas, and API specifications. Its markup tools generate, validate, and optimize JSON-LD, Microdata, and RDFa. A visual schema designer exports SQL for PostgreSQL, MySQL, SQLite, and SQL Server; database tools also diagram CREATE TABLE statements, compare schema versions, visualize queries, and offer templates. API tools validate JSON Schema, edit OpenAPI specifications, generate schemas and mock data, convert formats, and detect breaking changes. An AI Search Optimizer checks structured data readiness for ChatGPT Search, Perplexity, and Google AI Overviews. Pasted data is processed in browser JavaScript, and the maker says it is not sent to its servers. For URL-based markup checks, however, the server fetches the requested page for the browser to inspect. The free plan includes all tools without feature gates, limits, or signup. Persistent cross-device work and third-party URL crawling are not offered; an API Validator and Mock Server are marked as coming soon.

Schema.dev provides tools to build and test structured data for webpages, and describes a deployment tool as coming soon. Its guided point-and-click builder generates formatted JSON-LD, advertises more than 40 schema types, and lets users transform text or enter custom field content. The output can be copied into pages or used with the Schema deployer. A separate tester validates structured data supported by Schema.org through a user interface or optional API endpoint. The tester is described as supporting tests at scale in both pre-production and production environments; API checks can report errors, warnings, and recommended elements. The Schema Builder is also offered as a Chrome extension. Schema.dev lists free plans for the tester UI and builder extension, with an optional API for larger-scale testing. Deployment is described as using an existing tag manager or DNS, but the deployer is labeled coming soon; DNS-level integration for Cloudflare-managed DNS is also coming soon. The site links to a help center with a knowledge base and community contact option. Schema.dev is a product of seoClarity Labs. Its about page says seoClarity has been helping SEO professionals since 2008. The listed platforms are API, extension, and web.