Winwin ERD Designer

Start with an idea. Shape it into a database diagram. Winwin ERD Designer gives you a local visual editor, optional AI assistance and practical file exchange—without an app account.

START FREE Save up to 2 diagrams with up to 30 tables each. Create tables and columns, add keys, indexes and relationships, and use notes and perspectives to organize your work. Undo and redo changes as you design.

KEEP YOUR WORK PORTABLE Import and export SQL, DBML, ERM and ERD. ERD backups preserve the complete editable document, including tables hidden by your current perspective. Other formats may omit app-specific details; inspect conversion reports before export.

USE YOUR OWN AI Bring a supported provider API key or an OpenAI-compatible endpoint. Ask for table, column and relationship changes in natural language, or repair SQL/DBML import issues. Changes that exceed the Free limit stay unapplied; you can unlock Pro and retry the retained proposal without another AI request. AI is optional. Provider credentials and charges are separate, and relevant schema content is sent to your chosen provider.

UNLOCK PRO ONCE Pro removes the document and table plan limits and adds PNG, interactive SVG/HTML, Excel schema specifications and temporary LAN hosting. The app displays the App Store price for your region before purchase. Restore Purchases recovers access using your Apple purchase account. Existing paid App Store customers keep Pro after purchase verification.

REVIEW TOGETHER Viewers can follow a host's diagram, chat and export a copy on a trusted local network. They cannot edit the original. Pro hosting is an opt-in temporary server and is not simultaneous editing. Stop sharing after the session.

SQL support includes PostgreSQL, MySQL, MariaDB, SQL Server, SQLite, BigQuery and Snowflake. ERM conversion supports MySQL, PostgreSQL, SQL Server and SQLite. Keep important work backed up with ERD exports.

Support: help@winwinerd.com

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