Write and preview
A focused Mermaid editor with live, bundled rendering.
One workspace for every
Mermaid diagram.
Write, preview, organize, export and refine diagrams on Mac, iPhone, iPad, Android and Chrome.
Developer preview
One local-first editor
A single product for turning ideas into clear, portable diagrams—without putting your work in someone else’s cloud.
Keep everything local
Your diagrams, settings and prompts stay on your device.
Generate and refine
Connect your own Ollama server to generate, fix and refactor diagrams.
Export your work
Move diagrams into your documentation as SVG, PNG, PDF or Mermaid source.
Made for the screens you use
The same private workspace, shaped for desktop, tablet and phone.
Start anywhere. Keep it private.
PrivyMermaid renders and stores diagrams locally. Optional AI connects to the Ollama server you run and control.
5Devices supported
LocalRendering and storage
Your OllamaOptional AI, your hardware
Platform details
macOS
- Diagrams, settings and prompt templates stored in Application Support
- Sandboxed import and export through user-selected file access
- Embedded privymermaid-cli for scripted rendering (requires 1.4.0 or later)
iPhone & iPad
- Export as SVG, PNG or .mmd through the iOS share sheet
- Light, Dark, Forest and Neutral Mermaid themes
- Split source and preview view on iPad
Android Preview
- Ten Mermaid themes and four preview backgrounds
- Fourteen built-in software-development templates
- Import via the system document picker; export source, SVG, PNG and PDF
- Preview WebView loads local assets only and blocks network access while rendering
Chrome
- Context menu actions: Open in PrivyMermaid, Render selection in PrivyMermaid
- Editable Fix and Refactor prompt templates
- Diagrams and settings kept in chrome.storage.local