DB Planner
Design your schema and your system, together.
What it does
DB Planner turns DBML into interactive ER diagrams and Mermaid into class diagrams and flowcharts, on one board your whole team edits in real time. Import SQL from Postgres, MySQL, or MSSQL. Export C# models, SQL, DBML, Mermaid files, or export the board as an image. There is also an MCP server, so your AI assistant can set up projects, edit schemas, and lay out the board for you. Start on the free plan, no card needed. Pro is $5, which lets you create an org, and added seats are $5 after.
Design database schemas and system diagrams together in real time. DBML and Mermaid on one live board, with SQL import and C#, SQL, or DBML export.
DB Planner turns DBML into interactive entity relationship diagrams, and Mermaid into class diagrams and flowcharts, on one live blueprint your whole team edits in real time. Readable DBML as the source of truth, a live shared canvas, and designs that leave the board as working code. Typed fields, primary and foreign key badges, enums as their own cards, and curved relationship lines that highlight on hover. Split a schema across as many DBML files as you like. Tables and enums reference each other across files automatically, with no import lines to maintain. Table albums { id uuid [pk] } tracks.dbml Table tracks { album_id uuid [ref: > albums.id] } LIVE Real-time collaboration Everyone…from dbplanner.io
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