Design Studio — free system design tool

One studio for software system design: C4 architecture, UML structure, ERD data models, sequence, state, activity, and use case diagrams, docs, whiteboard, and API contracts. Every artifact is versioned and comparable.

Frequently asked questions

Is Pregoo Design Studio free?

Yes. You can create C4, UML, ERD, sequence, and other diagrams without an account and sign up free to keep more projects.

Can I import an existing database schema?

Yes. Data modeling imports SQL DDL, DBML, Prisma, OpenAPI JSON, and JSON Schema, and never connects to a live database.

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Pregoo by Egintsoft · [email protected]