DiagramForge

Create Professional Diagrams with Private On-Device AI

DiagramForge transforms ideas, source code, and technical documentation into professional Mermaid diagrams—entirely on your Mac.

Describe a system in plain English, paste source code, import a supported source file, or edit Mermaid directly. DiagramForge generates clean, editable diagrams while keeping your work private. Once your local AI model is installed, diagram generation works completely offline.

No cloud AI. No project uploads. Your source code stays on your Mac.

AI-Powered Diagram Generation

Turn natural language into diagrams in seconds.

Generate:

• Sequence Diagrams
• Flowcharts
• Class Diagrams
• State Diagrams
• Entity Relationship (ER) Diagrams

DiagramForge automatically validates Mermaid syntax before replacing your existing diagram, helping prevent accidental loss of work.

Multiple Ways to Create Diagrams

Choose the workflow that fits your project:

• Describe your diagram in plain English
• Paste source code
• Import supported source-code and text files
• Write Mermaid directly with live preview

Supported source formats include:

• Swift
• Objective-C
• C
• C++
• C#
• Java
• Kotlin
• JavaScript
• TypeScript
• Python
• Go
• Rust
• PHP
• HTML
• CSS
• JSON
• XML
• YAML
• Markdown
• Mermaid

Built-In Mermaid Editor

DiagramForge is also a complete Mermaid editor.

Features include:

• Live Preview
• Syntax validation
• AI-powered Mermaid repair
• AI diagram improvements
• Multiple Mermaid themes
• Starter templates
• Diagram rename and organization
• Automatic saving

Offline AI

DiagramForge runs AI locally using downloadable on-device language models.

After installing a supported model:

• AI generation works offline
• No source code is sent to external servers
• No cloud inference
• No account required
• No tracking of your projects

Designed for developers who want privacy without sacrificing productivity.

Professional Export

Export diagrams for documentation, presentations, and technical specifications.

Export formats include:

• SVG
• PNG

Copy SVG directly to the clipboard for documentation, Git repositories, wikis, and Markdown.

Starter Templates

Jump-start new diagrams with professionally designed templates, including:

• Login Sequences
• REST API Flows
• State Machines
• Class Diagrams
• Entity Relationship Diagrams
• CI/CD Workflows

DiagramForge Pro

DiagramForge includes a generous free experience.

Upgrade to DiagramForge Pro with a one-time purchase to unlock:

• Unlimited on-device AI diagram generation
• Unlimited AI Mermaid repair
• Unlimited AI diagram improvements
• Future Pro features and premium local AI models

No subscription.
No recurring fees.
Your Pro purchase unlocks the complete DiagramForge experience on your Apple account.

Built for Apple Silicon

DiagramForge is designed specifically for modern Macs and takes advantage of local AI acceleration to generate diagrams quickly while keeping your data private.

Whether you’re documenting software architecture, visualizing APIs, reverse-engineering source code, planning systems, or writing technical documentation, DiagramForge helps you create professional diagrams faster—without sending your work to the cloud.