Every document you open (Markdown, HTML, React/JSX, .prsm) is processed entirely on your device. Nothing is uploaded anywhere.
No analytics, no trackers, no advertising and no account system.
The app makes no network requests of its own. A document may reference remote images or links; those load through system WebKit only when you open it, exactly as in a browser.
Recent files are remembered locally using iOS security-scoped bookmarks, and you can clear them any time from the home screen.
Since no data is collected, no data is shared with third parties.