PRO Features

Diagrammix3 is available as a free download with optional PRO features that unlock advanced diagramming capabilities.

Free vs PRO

PRO-Only Features

Autostyles

Transform the look of your diagrams with one-click canvas themes:

• Sketch — hand-drawn, organic look with hachure fills and wobbly lines
• Comic — bold, thick outlines with exaggerated curves
• Blueprint — technical drawing style with crosshatch fills and precise lines
• Fine-tune each style's parameters (roughness, bowing, stroke thickness, fill patterns) in the Theme Style inspector
• Switch between styles instantly — your diagram content stays the same

Mind Maps

Capture and organize ideas in a dedicated mind-mapping mode:

• Grow maps from the keyboard (Tab for a child, Return for a sibling)
• Eight structures (Mind Map, Logical, Org Chart, Tree, Catalog, Fishbone, Timeline, Vertical Timeline)
• Built-in themes, per-node icons and shapes, group frames, and summaries
• Import and export Markdown, OPML, and XMind
• See the Mind Maps guide

Custom Styles

Save your own reusable diagram styles alongside the built-in canvas themes:

• Duplicate a built-in style or start fresh, then fine-tune every parameter
• Apply your styles to any document from the Autostyle menu
• Recreate a look from a reference image over MCP
• See the Custom Styles guide

ASCII Diagrams

Create and export text-based diagrams using ASCII characters:

• Dedicated ASCII diagram page type with a character grid canvas
• Draw boxes, lines, arrows, and text using ASCII/Unicode characters
• Export diagrams as plain text (.txt) for use in code comments, documentation, and terminals
• Choose between ASCII and Unicode character sets

UML Class Diagrams

Create professional UML class diagrams with:

• Class shapes with attributes and methods sections
• Inheritance, association, and dependency connectors
• Proper UML notation and styling
• Smart layout for class hierarchies

UML Sequence Diagrams

Build interactive sequence diagrams with:

• Participant lifelines
• Synchronous and asynchronous messages
• Activation bars
• Self-calls and return messages
• Combined fragments (loops, alternatives)

SVG Import & Export

Work with scalable vector graphics:

• Import SVG files onto the canvas as editable shapes
• Export your diagrams as SVG for web publishing
• Preserves paths, text, and styling
• Compatible with vector editors like Illustrator, Figma, and Inkscape

Mermaid Import & Export

Integrate with text-based diagramming:

• Preview and validate Mermaid before it lands on the canvas
• Keep editing imported diagrams in Mermaid notation with the </> source editor
• Copy a diagram back as Mermaid text for use in Markdown, GitHub, and documentation
• Supports flowcharts, sequence diagrams, and more

AI Integration (MCP Server)

Let AI assistants build diagrams for you:

• Built-in MCP server works with Claude, Codex, and other AI assistants
• Describe what you need — AI creates symbols, connectors, and layouts on the canvas
• AI reads your current document and can modify existing elements
• Batch creation of complete diagrams in a single undo step
• See the AI Integration guide for setup instructions

Purchasing PRO

To unlock PRO features:

1. Go to Diagrammix3 → Purchase PRO... in the menu bar
2. Review the available options
3. Complete your purchase through the Mac App Store

Your purchase is a one-time payment with no subscription required.

Restoring Purchases

If you've previously purchased PRO on another device or after reinstalling:

1. Go to Diagrammix3 → Restore Purchases in the menu bar
2. Sign in with your Apple ID if prompted
3. Your PRO features will be restored automatically

Checking Your Status

You can verify your PRO status by:

• Looking for the PRO badge in the app
• Attempting to create a UML diagram (PRO-only)
• Checking Diagrammix3 → About Diagrammix3

Family Sharing

If you're part of an Apple Family Sharing group, your PRO purchase may be available to other family members depending on your Family Sharing settings.