New in this release: Mind maps, sticky notes with images, custom styles and templates, a preview-first Mermaid workflow, and AI control over MCP. See What's New.

Key Features

  • Native macOS Experience: Built with SwiftUI and AppKit for a fluid and responsive interface.
  • AI-Powered Diagramming: Describe what you need — AI creates symbols, connectors, and layouts via the built-in MCP server.
  • Mind Maps: Capture ideas in a dedicated, keyboard-driven mind-mapping mode.
  • Smart Connectors: Connect shapes with lines that automatically route around obstacles.
  • UML Diagrams: Create class diagrams and sequence diagrams with full UML notation support.
  • Visio Compatibility: Import and export Microsoft Visio .vsdx files for enterprise interoperability.
  • SVG Support: Import and export SVG files with high fidelity (SVG 1.2 support).
  • Mermaid Integration: Import with live preview and validation, and keep editing in Mermaid notation.
  • Custom Styles & Templates: Save reusable styles and build your own notation packs.
  • Sticky Notes: Drop quick notes — with attached images — anywhere on the canvas.
  • Notation Library: Access a wide range of standard symbols and an icon-set library.
  • Layers: Organize complex diagrams with multiple layers.
  • Auto-Layout: Automatically arrange diagrams with hierarchical, tree, radial, and more algorithms.
  • Multiple Export Formats: Export to PNG, JPEG, PDF, and SVG at various scales.
  • iCloud Sync: Access your diagrams across all your Mac devices.

Diagrammix3 Main Interface

Getting Started

New to Diagrammix3? Start here:

  1. Interface Overview - Learn the main parts of the application
  2. Working with Shapes - Create and edit shapes
  3. Connectors - Connect shapes with smart routing
  4. Keyboard Shortcuts - Speed up your workflow

Manual Sections

Tools

Complete reference of all drawing and editing tools, from basic selection to advanced vector path editing.

Working with Diagrams

Learn the fundamentals of creating diagrams, from shapes and connectors to tables and text.

Styling

Customize the appearance of your diagrams using fills, strokes, the Inspector, and shape styles.

UML Diagrams

Create professional UML diagrams including class diagrams and sequence diagrams.

Advanced Topics

Explore advanced features like AI integration, mind maps, auto-layout, layers, Mermaid support, and export options.

Reference

Quick reference guides including the arrowhead gallery, notation library, and custom templates.

System Requirements

  • macOS 13.0 or later.