Privacy Policy — PrivyMermaid (macOS)

Last updated: January 2026

This Privacy Policy describes how PrivyMermaid ("the App") handles information when you use the macOS application. The App is designed with privacy in mind: we do not collect, transmit, or sell your personal data.

1. Summary

• No personal data collection. We do not collect, store, or transmit any personally identifiable information.
• No location data. The App does not use device location or request location permissions.
• No analytics or tracking. The App does not include analytics, advertising, or third-party tracking.
• Data stays on your Mac. All content and settings are stored only on your device.
• Optional network use. The App may connect to a local or user-configured Ollama server; no data is sent to our servers or other third parties.

2. Data Stored on Your Device

The App stores the following data only on your Mac, in the standard macOS Application Support folder:

• Diagrams: Your Mermaid diagrams and diagram metadata (e.g. titles), saved in a local file (diagrams.json).
• Settings: App preferences (e.g. Ollama endpoint, Mermaid theme), saved in a local file (settings.json).
• Prompts: Your editable prompt templates for Generate, Fix, and Refactor, saved in a local file (prompts.json).

This data is never uploaded to our servers or shared with third parties. It remains under your control and is removed when you delete the App or its Application Support data.

3. File Access

The App can read and write files only when you explicitly choose them (e.g. Import/Export). It uses macOS sandbox "user-selected file" access. We do not access your files without your action.

4. Network Use

The App may connect to the internet or your local network only for Ollama: If you enable and configure the Ollama integration, the App sends diagram text and prompts to the Ollama endpoint you specify (by default, http://localhost:11434). This communication is between your Mac and your own Ollama instance. We do not receive, store, or process this data.

The App does not phone home, send analytics, crash reports, or usage data, and does not include advertising or tracking SDKs.

5. No Location Data

The App does not use device location (GPS or otherwise) and does not request or include the location entitlement.

6. No Account or Cloud Sync

The App does not require an account. There is no cloud sync, no login, and no server-side storage of your content.

7. Your Control and Data Deletion

All App data is stored locally. To delete it, remove the App and, if you wish, delete the folder ~/Library/Application Support/PrivyMermaidMac/.

8. Children's Privacy

The App does not collect personal information. We do not knowingly collect data from children.

9. Changes to This Policy

We may update this Privacy Policy from time to time. The "Last updated" date at the top will be revised when changes are made.

10. Third-Party Software

The App may bundle or use third-party software (e.g. for diagram rendering). Licenses and attribution are set out in THIRD_PARTY_NOTICES.

11. Contact

If you have questions about this Privacy Policy, please contact us at the support or contact address provided in the App Store listing or on the App's official website.

PrivyMermaid is a macOS application for editing and previewing Mermaid diagrams, with optional local AI assistance via Ollama.