Privacy
short version: we count page views, the app counts nothing
This website
Static pages and no cookies. Self-hosted OpenPanel counts page views and outgoing link clicks without cookies or personal data. The host also sees ordinary request logs.
The Excaliself app
You run it on your own server. Accounts, drawings, and pasted images are stored in your Postgres database. The app does not phone home and sends no telemetry.
Questions
Open an issue on GitHub and it gets answered there.