PrivyMermaid: AI Diagram

PrivyMermaid is a privacy-focused diagram editor for developers, technical writers, and teams who work with Mermaid and D2. Create, import, edit, organize, preview, and export diagrams on your iPhone or iPad.

The Mermaid and D2 renderers are bundled in the app, so you can keep working without an internet connection. Your diagrams stay on your device by default; no diagram source is sent to a rendering service.

Key Features:

Mermaid + D2, fully offline

Two diagram languages: Create and preview Mermaid or D2 diagrams, including flowcharts, sequence diagrams, Gantt charts, architecture diagrams, and more.

Local rendering: Visualize diagrams without an internet connection. The rendering engines run in the app, not on a diagram server.

Import and export: Work with Mermaid (.mmd) and D2 (.d2) source files, then export SVG, PNG, PDF, or GIF.

Projects and templates

Organize your work: Keep diagrams in native projects and switch between documents quickly.

Built-in templates: Start from ready-made diagram examples, clearly labeled for Mermaid or D2.

Live preview and themes: See manual edits immediately and choose a Mermaid or D2 theme plus your preferred preview background.

Privacy on your terms

Local by default: Diagrams are stored locally and no account is required for offline editing.

Optional Diagram Cloud sync: If you choose to sign in, diagrams can sync to your Diagram Cloud account. Your local copy remains available offline.

Why PrivyMermaid?

Keep technical documentation close at hand without depending on a browser tab or a hosted rendering service. PrivyMermaid is a lightweight, private way to diagram on the go.

Note: For AI-assisted Mermaid and D2 generation, questions, and fixes using your local LLM, check out PrivyMermaid Pro (in-app: tap the Pro tab or open the Pro panel; or download the separate PrivyMermaid Pro app).