YourERD

What YourERD is

YourERD is a free browser-based tool for drawing entity-relationship diagrams and exporting them. Its editor supports Barker notation, including identifying, non-identifying and optional relationships, as well as one-to-one and one-to-many cardinalities. When a user creates a relationship, YourERD adds a foreign-key column based on the parent entity’s primary key. Tables and columns can have physical and logical names, and logical names can appear as comments in generated DDL. Diagrams can be exported as MySQL 8 DDL, PNG images or JSON files; MySQL 8 is the listed DDL target. Drawing and exporting do not require an account. Signing in enables cloud storage and share links, where others can view live diagram updates but only the owner can edit. An MCP server connects the tool to Claude Code for creating diagrams from natural-language descriptions. The maker says it was designed in part for modelling practices that use Barker notation and pair technical and human-readable names. The free plan costs nothing and displays ads. The privacy policy says diagrams are not sent to the server when used without signing in.

Who it suits

YourERD may suit people who model databases with Barker notation and want technical and human-readable names side by side. It is also aimed at users who need MySQL 8 DDL, PNG or JSON exports in a browser.

Limits

The Free plan costs nothing and shows ads on the site. MySQL 8 is the available DDL target, and only the owner can edit a shared diagram.

Getting started

1. Open https://yourerd.com/en/ in a web browser
2. Draw entities and relationships in the editor
3. Export as MySQL 8 DDL, PNG, or JSON
4. Sign in if you want cloud storage and share links
5. Connect its MCP server to Claude Code for natural-language diagram creation

Verdict

YourERD covers diagramming, exports and share links without requiring an account for drawing or exporting. Its DDL target is limited to MySQL 8, and shared viewers cannot edit.