The short version
MacMD Viewer does not access, store, or transmit your files. Your Markdown files are read locally on your Mac and never leave your machine. The app sends minimal anonymous usage signals to help us improve the product. You can opt out at any time in Preferences.
Anonymous usage analytics
MacMD Viewer uses TelemetryDeck to collect anonymous usage signals such as which features are used (e.g. Mermaid diagrams, code highlighting) and whether license activation succeeds. This helps us understand what to improve.
What is NOT collected: file contents, file names, file paths, personal information, IP addresses, or any data that could identify you. TelemetryDeck aggregates all data server-side. No individual user profiles are created.
Opt-out: you can disable telemetry at any time in MacMD Viewer → Preferences → uncheck "Send anonymous usage data". When disabled, no signals are sent.
File access
The app reads Markdown files (.md) that you explicitly open. It uses macOS sandboxed file access. Files are read from disk, rendered in memory, and displayed. No file contents are stored, cached externally, or transmitted anywhere.
QuickLook extension
The QuickLook extension runs within macOS sandbox restrictions. It receives file data from the system, renders it, and displays the preview. No data is retained after the preview window closes.
Third-party services
MacMD Viewer uses TelemetryDeck for anonymous analytics (see above) and Sparkle for automatic update checks. No advertising networks or data brokers are used. If you purchase through the website, Stripe processes the payment under their own privacy policy.
Children's privacy
MacMD Viewer does not collect any personal information from anyone, including children under 13.
Changes to this policy
If this privacy policy changes, updates will be posted on this page with a revised date.
Contact
Questions about this policy? Reach out at support@macmdviewer.com.