PRO Features
Diagrammix3 is available as a free download with optional PRO features that unlock advanced diagramming capabilities.
Free vs PRO
| Feature | Free | PRO |
|---|---|---|
| Shapes, connectors, flowcharts | ✓ | ✓ |
| All 11 notation packs | ✓ | ✓ |
| Tables, layers, groups | ✓ | ✓ |
| Auto-layout | ✓ | ✓ |
| Visio import/export | ✓ | ✓ |
| Export PNG, JPEG, PDF | ✓ | ✓ |
| UML Class Diagrams | — | ✓ |
| UML Sequence Diagrams | — | ✓ |
| SVG Import & Export | — | ✓ |
| Mermaid Copy & Paste | — | ✓ |
| AI Integration (MCP Server) | — | ✓ |
PRO-Only Features
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 Copy & Paste
Integrate with text-based diagramming:
- Paste Mermaid syntax to generate an editable diagram on the canvas
- 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:
- Go to Diagrammix3 → Purchase PRO... in the menu bar
- Review the available options
- 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:
- Go to Diagrammix3 → Restore Purchases in the menu bar
- Sign in with your Apple ID if prompted
- 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.