CalSync — Open Source Calendar App

Calendar Sync automatically copies events from one local calendar to another on your device. When an event appears in your source calendar, a corresponding event is created in your target calendar using a name you choose. Perfect for sharing availability across personal and work calendars, or keeping multiple calendars in sync without manual entry. Features: - Select any local device calendar as source or target - Customize the synced event name (e.g., "Busy") - Original event title is preserved in the description - Sync runs automatically in the background at your chosen interval - Changes to already-synced events are detected and propagated - Deletions in the source calendar are mirrored to the target No account required. All data stays on your device.