Preview release · Private multi-calendar synchronization
One schedule across the calendars you already use.
Project Marvin connects authorized Microsoft 365, Outlook.com, Apple / CalDAV, and Google calendars. It mirrors availability automatically while preserving source ownership, privacy rules, and time zones.
Project Marvin is currently Preview software. Apple integration is the active release train. Google follows, then the update, state, deletion, and host-validation gates required before general availability.
Private by default
Mirrored events default to private. Per-target policies control visibility, details, location, description, and source prefixes.
Delegated access
Each calendar owner authorizes their own account. Project Marvin requests delegated provider access rather than tenant-wide Microsoft Graph application permissions.
Provider-aware sync
Microsoft and Google support webhook-driven synchronization. Apple / CalDAV uses scheduled polling.
Loop and delete safety
Managed-event markers and durable mappings prevent loops. Provider deletion is disabled by default and source events remain owned by their original calendars.