isSemantic.net vs Schema.dev

isSemantic.net is a free web tool for validating, generating, visualizing and converting structured data. Its validator accepts JSON-LD, RDFa and Microdata and checks them against Schema.org, Google Search, Facebook Open Graph, Twitter Cards, Facebook App Links and HTML outline semantics. Markup using other vocabularies appears separately and is not validated. The generator creates or edits examples for Google Search, Schema.org, Open Graph and Twitter Cards, accepts imported snippets and allows added Schema.org properties. Google and Schema.org output is JSON-LD; Open Graph and Twitter Cards output is RDFa. The RDF visualizer shows a graph, triples table and hierarchy. It supports formats including JSON-LD, Microdata, N-Quads, N-Triples, N3, RDFa, RDF/XML, TriG and Turtle, with provisional RDF-star support. The converter accepts a URL or snippet, detects formats and converts serializations. Terms restrict use to private, non-commercial purposes.

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.