Offline-first. No telemetry. No tracking. Security & privacy by design.

ER diagrams without the clutter

Design clear entity-relationship diagrams with a fast, native desktop application for Windows, macOS and Linux.

Create tables, attributes and relationships visually, save your diagrams in an open JSON-based format, and export them to PDF or SVG.

Simple by design

Create and organize tables, columns, keys, and relationships in a clean diagramming environment.

Save and reopen your diagrams as JSON files. Your models remain under your control.

Create high-quality documents and scalable graphics directly from your diagrams.

Orthodiagrams runs locally on Windows, macOS, and Linux.

Less visual noise. More understandable models.

Orthodiagrams is designed to keep ER diagrams clean and easy to read, even as a model grows.

Relationships follow clear, structured paths, while visual elements are kept intentionally restrained so that tables, attributes, and connections remain the focus of the diagram.
A clean diagram is not only easier to understand — it is also easier to review, discuss, and exchange with other people.
Structured connections help reduce unnecessary line crossings and visual clutter.

The interface avoids decorative elements that compete with the information contained in the model.
Save the diagram as JSON for continued editing, or export it to PDF and SVG for documentation, reviews, and communication.
Orthodiagrams encourages a predictable visual structure, making models easier to understand when they move between developers, teams and projects.