Tracking and advertising
Dreamspell is described as not using app data for tracking across apps or websites, not including third-party advertising, and not selling user data in the current version.
Data sharing
The current version is described as not transmitting journal content or Dreamspell calculation data to the developer, and not sharing journal entries or Dreamspell readings with third parties.
Data retention
Journal entries remain on the device until the user edits or deletes them, or removes the app and its local data. Bundled reference data remains part of the installed app package.