CalendarPipe is a programmable calendar automation platform that sits between your calendars and gives you complete control over how events move between them. Instead of treating calendar synchronization as a simple copy-and-paste operation, CalendarPipe allows users to create custom workflows that filter, transform, and route events across Google Calendar, Outlook, and Apple Calendar.
The core concept revolves around "pipes" — configurable rules that determine what happens when events enter a workflow. A pipe might copy work meetings from one calendar to another, strip sensitive information before sharing events externally, automatically rename events based on specific conditions, or route different types of meetings to different calendars. The goal is to make calendar synchronization flexible enough to match how people actually work.
One of the platform's most interesting aspects is the variety of ways users can build these workflows. Non-technical users can create pipes visually or describe what they want in plain English using AI. Developers can take things further by writing custom logic in TypeScript, making CalendarPipe suitable for both simple personal automations and more sophisticated organizational workflows.
The product also extends beyond traditional calendar users. CalendarPipe is built with AI agents in mind, providing APIs, CalDAV support, and MCP integration that allow agents to create calendars, manage events, and send invitations programmatically. Rather than treating calendars as static scheduling tools, it turns them into programmable infrastructure that both humans and software agents can interact with.
Another notable feature is how invitations are handled. Events can be delivered as real calendar invitations, eliminating much of the friction typically associated with cross-platform calendar sharing and reducing the need for recipients to authorize access to their own calendar accounts.
As AI assistants become increasingly involved in scheduling, coordination, and workflow management, CalendarPipe positions itself as a bridge between traditional calendar systems and the emerging world of autonomous agents. It offers a flexible foundation for anyone who wants more control over how calendar data moves, transforms, and integrates across their personal or professional ecosystem.