Multi Provider Calendar Aggregation With Unified Schema

via “multi-provider calendar aggregation with unified schema”

Calendar sync tool & universal calendar MCP server. Aggregate, sync and control calendars on Google, Outlook, Office 365, iCloud, CalDAV or ICS.

Unique: Implements provider-agnostic adapter pattern with RFC 5545 iCalendar as the internal canonical format, allowing CalDAV and ICS sources to be treated as first-class citizens alongside OAuth2 APIs without special-casing; most competitors (Zapier, IFTTT) treat CalDAV as a secondary integration

vs others: Supports self-hosted CalDAV and ICS sources natively without cloud dependency, whereas Zapier and Make.com require paid connectors and don't support local ICS files