PrivyMermaid (Android)

Private, offline-first Mermaid diagram editing for Android phones and tablets.

Android developer preview

PrivyMermaid for Android is currently a developer preview (version 0.1.0). The offline editor is ready for hands-on testing, but it is not yet a public Google Play release. Pro purchases and release AI workflows are still under development.

Overview

PrivyMermaid is a native Android workspace for creating, editing, previewing, importing, and exporting Mermaid diagrams. It is designed for keeping diagram source and rendering on your device, without an account, cloud renderer, or analytics SDK.

Available in the preview

  • Offline rendering — Mermaid and its preview page are bundled with the app. The preview WebView loads only local app assets and blocks network and file access while rendering diagrams.
  • Live source and preview — Write Mermaid source in a monospace editor and see the rendered diagram update as you work.
  • On-device document library — Create, rename, duplicate, delete, and automatically save diagrams in the app's local database.
  • Themes and backgrounds — Choose from ten Mermaid themes and four preview backgrounds, with your choices retained locally.
  • Template library — Start from fourteen included software-development templates, then tailor the Mermaid source to your project.
  • System import, export, and sharing — Import .mmd or text files with Android's document picker; export or share Mermaid source, SVG, PNG, and PDF files through Android's standard file and share flows.

Private by design

Your documents stay in the app's private storage, and rendering happens locally. There is no sign-in, cloud sync, telemetry, crash reporting, or tracking in the app. The app does not request broad storage or media permissions; import and export use the files you explicitly select in the system picker.

Pro and local AI

The Android preview includes settings for user-configured Ollama, LM Studio, and OpenAI-compatible endpoints, including encrypted local token storage. These settings support development and model discovery today. The release Pro purchase flow and Generate, Ask, and Fix workflows are not available in the Android developer preview yet.

When these features ship, requests will go directly to the endpoint you choose—there is no PrivyMermaid cloud relay. A custom endpoint may be outside your local network, so only configure providers you trust.

Requirements

  • Android 13 (API 33) or later
  • An Android phone, tablet, foldable, or compatible emulator
  • A compatible local or trusted provider is optional and only relevant to future Pro AI features.
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