Privacy Policy — PrivyMermaid (iOS)

Last updated: February 2026

PrivyMermaid is a private, offline-first Mermaid diagram editor for iOS. We are committed to protecting your privacy. This policy explains how PrivyMermaid handles—or does not handle—your data.

1. Core Principles

• Offline-first: Your diagrams, source code, and settings are stored locally on your device.
• No data collection: We do not collect, transmit, or store any of your personal data on our servers.
• No tracking: We do not use any analytics, tracking, or advertising SDKs.

2. Data Storage

Local Storage

PrivyMermaid stores the following data locally on your iPhone or iPad:

• Diagrams: Mermaid source code and diagram files you create
• App settings: Preferences such as theme selection, Ollama server URL (Pro only), and editor configuration
• Exported files: SVG, PNG, and .mmd files are saved to your device and shared via the iOS share sheet

3. Pro Features & Privacy

PrivyMermaid Pro introduces AI-powered capabilities such as:

• Ask: AI-generated diagram creation from plain text
• Fix: AI-powered syntax correction and diagram optimization
• LAN Ollama: Connection to your local Ollama server for AI processing

Crucially, these Pro features adhere to the exact same offline-first privacy policy.

• No Cloud Processing: All AI requests are sent exclusively to your self-hosted Ollama instance on your local network (LAN). No data is sent to any external AI services.
• Local Network Only: Pro connects to Ollama via a LAN address you configure (e.g., http://192.168.1.x:11434). Your prompts and diagrams never travel beyond your local network.

Network Requests

PrivyMermaid makes the following network requests:

• Free version: No network requests whatsoever. The app runs 100% offline.
• Pro version (optional): If you configure an Ollama server, the app sends requests to your local network Ollama instance for AI features (Ask / Fix).

Important: All AI processing runs on your local Ollama server. Your data is never sent to any external AI services or cloud endpoints.

4. What We Do Not Do

• We do not collect usage data or analytics
• We do not sell or share data with third parties
• We do not track your behavior
• We do not require registration or login
• We do not use ads or third-party SDKs

5. Third-Party Services

PrivyMermaid does not integrate any third-party analytics, advertising, or tracking services. The Mermaid rendering engine (MIT license) runs entirely locally in an embedded WebView.

6. Data Security

Because all data is stored locally, the security of your data depends on your device's security settings. We recommend:

• Setting a strong passcode or Face ID / Touch ID
• Keeping your iOS version up to date

7. Children's Privacy

PrivyMermaid is not directed at children under 13. We do not knowingly collect personal information from children.

8. Policy Changes

We may update this privacy policy from time to time. Material changes will be communicated in-app or through other appropriate means.

9. Contact Us

For privacy-related questions, please contact:

• Developer: Ken Wang
• Bundle ID (Free): com.kenelite.privymermaid
• Bundle ID (Pro): com.kenelite.privymermaid.pro
• GitHub: github.com/kenelite/privacypolicy

PrivyMermaid is a non-commercial product; we do not guarantee response times.

PrivyMermaid — Private, Offline-first Mermaid Diagram Editor for iOS