About dbdiagram.io

dbdiagram.io is a web tool for drawing database schemas. Instead of dragging boxes, users describe tables, columns and relationships in a simple domain-specific language, DBML, and the site renders an entity relationship diagram that updates as the code changes.

The vendor presents it as a quick and simple free tool for designing database relationship diagrams and flows. It is a proprietary, vendor-hosted service that runs in the browser, and the DBML language it uses is open and used by other tools. Sharing, exporting and paid features are described on the site itself.