ChartDB

ChartDB is a free, open-source database diagram editor built to make understanding and evolving your schema fast and practical. Instead of spending hours reverse‑engineering tables and relationships, you can visualize a database structure from a single query and get a clear ER-style diagram in seconds. It’s designed for both exploring existing databases and planning new ones: import a schema, refine entities and relationships in the editor, and keep iterating until the model matches what you want to ship.

A standout part of ChartDB is its AI-assisted DDL generation. After you design or adjust your diagram, ChartDB can generate DDL scripts in your preferred SQL dialect, helping you move from a visual model to runnable database definitions with less manual rewriting. This is especially useful when you need to migrate, prototype, or share a schema with teammates who prefer code over diagrams.

ChartDB supports a workflow that stays simple: start with a query to pull structure, instantly render the diagram, edit as needed, then export your diagram and SQL output. For teams, it also works well as a communication tool—sharing a clean visual preview of a schema can speed up reviews and reduce misunderstandings about relationships, keys, and table responsibilities.

Because it’s open-source, ChartDB is approachable for developers who want transparency, extensibility, or the option to self-host depending on their needs. Whether you’re documenting an existing database, spinning up a new project with a reference template, or preparing DDL for deployment, ChartDB focuses on getting you from idea (or legacy schema) to a concrete, shareable design quickly.