PrivyMermaid (iOS)
Private Offline Diagram Editor for iPhone & iPad
Overview
PrivyMermaid is a privacy-focused Mermaid diagram editor for iPhone and iPad. It lets developers and technical writers write, preview, theme, export, and manage diagrams offline, with Pro support for local Ollama-powered generation, fixing, and refactoring.
Features
- Offline rendering — Instantly visualize Mermaid code into diagrams without an internet connection
- Live preview — See diagram changes in real-time as you edit the source
- Theme selection — Choose from Light, Dark, Forest, and Neutral Mermaid themes
- Multi-format export — Export diagrams as SVG, PNG, or Mermaid source files (.mmd) via the iOS share sheet
- Full Mermaid syntax — Flowcharts, Sequence diagrams, Gantt charts, Class diagrams, and more
- Local storage — All diagrams saved on-device with no account required
Advantages
PrivyMermaid stores diagrams, source code, and settings on your device. It does not require cloud rendering, accounts, analytics, or third-party tracking SDKs, and Pro AI features connect only to the local Ollama server you choose.
Benefits
Draft diagrams wherever you are, export them into documentation, and use local AI to repair syntax or generate starting points without exposing proprietary architecture to hosted diagramming tools.
PrivyMermaid Pro
PrivyMermaid Pro combines the security of offline editing with the power of your own Local LLM. Connect directly to your self-hosted Ollama instance to generate, fix, and refactor Mermaid diagrams using AI—all while keeping your data within your local network.
Free vs Pro
| Capability |  Free |  Pro |
|---|---|---|
| Offline Diagram Preview | ✅ | ✅ |
| Mermaid Source Editing | ✅ | ✅ |
| Theme Selection | ✅ | ✅ |
| Export (SVG, PNG, .mmd) | ✅ | ✅ |
| AI Ask — Generate Diagrams | ❌ | ✅ |
| AI Fix — Auto-correct Syntax | ❌ | ✅ |
| LAN Ollama Connection | ❌ | ✅ |
| Streaming AI Responses | ❌ | ✅ |
AI-Powered Diagramming
- Just Ask — Describe a workflow or system in plain English, and watch the AI generate complex Mermaid code for you
- Smart Fix & Refactor — Have a broken diagram or messy code? The "Fix" tool uses your local LLM to correct syntax errors and optimize layouts instantly
- LAN Ollama Support — Connects securely to your
local Ollama server (e.g.,
http://192.168.1.x:11434) - Real-time Streaming — Experience live code generation as the AI streams the response directly to your editor
Why PrivyMermaid Pro?
Perfect for power users running Llama 3, Mistral, or Gemma. Stop manually writing boilerplate code—let your local AI handle the syntax while you focus on the architecture. All AI processing stays on your local network.
Requirements
- iOS 17.0 or later (iPhone and iPad)
- Ollama (optional) — Required for Pro AI generation, fix, and refactor features. The server must be reachable from your iPhone or iPad. Download at ollama.ai
iPhone Screenshots
iPad Screenshots
