DB Planner is a browser-based database planner. The schema is text (DBML), and the ER diagram is drawn from it, so the picture never drifts from the design. Start by writing DBML, by importing a SQL dump from PostgreSQL, MySQL or SQL Server, or by importing a Prisma, EF Core, Rails, Django or TypeORM schema.
Teams work on one live board: cursors, tables as they are dragged, sticky notes and drawings appear for everyone as they happen. Large schemas split across files with references resolving between them. Comment threads sit on tables, changes can be proposed and merged by a teammate, and every document keeps its history. AI agents such as Claude and Cursor can read and propose changes over a hosted MCP server.
Free for one project with ten documents. Pro is $5 a month, and each teammate is a $5 seat.
