Project Marvin

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Paranoid Keeper ​

Paranoid Keeper is the always-on calendar synchronization application in the Project Marvin repository.

Guarantees ​

  • Every connected calendar is both a source and a target for every other connected calendar.
  • A mirror keeps the source prefix, subject, location, description, event duration, and source timezone behavior.
  • Mirrors are private by default.
  • Trusted targets, such as family calendars, can opt into normal visibility and alternate detail policies.
  • Managed event markers and persistent mappings prevent sync loops.
  • Updates change existing mirrors and source deletions remove stale mirrors.
  • All-day events remain all-day across Microsoft, Google, and CalDAV targets.

Supported Providers ​

  • Microsoft 365 and Outlook.com through Microsoft Graph OAuth, subscriptions, and webhooks.
  • Google Calendar through Google OAuth, event watches, and webhooks.
  • Apple Calendar through CalDAV server credentials and periodic polling.

Runtime ​

After every connected account validates, Paranoid Keeper starts automatically and remains active in the hosted Container App. The local installer starts the same application for local testing. See Getting Started and Azure deployment.