Schema.biz vs SchemaValid

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.

SchemaValid is a browser-based toolkit for JSON-LD, structured data and technical SEO. Its tools include schema validation, sitemap and robots.txt utilities, plus tools for text and content, AI search, analytics, campaigns and other tasks such as IBAN validation. The validator checks a live URL or pasted JSON-LD and reports an SEO score, errors, warnings and rich-results readiness. URL checks provide scorecards for 16 schema types, including Organization, Product, Article, Recipe, Event, FAQPage, JobPosting, Course, VideoObject and SoftwareApplication; the limit is five URL checks per minute per visitor. Pasted-code validation runs locally without uploading or storing the code or tying it to an account. The AI Search Readiness Checker scores a page out of 100 across eight categories, using the page and its robots.txt, sitemap.xml and llms.txt. A robots.txt editor offers a live preview for crawler rules, AI-bot access and sitemap settings. The tools are free without registration, though availability may change.