CalBridge: Two way calendar sync tool – Self-hosted two-way Google Calendar sync with granular controls

Summary: CalBridge is an open-source, self-hosted tool for two-way Google Calendar synchronization with granular copy controls, smart filtering, loop prevention, and bounded backfill. It can be deployed easily and runs at low cost on a VPS or locally for free.

What it does

It synchronizes Google Calendars bidirectionally, allowing users to select specific data to sync and filter events by keyword or color. It prevents sync loops and controls backfill limits.

Who it's for

Users needing customizable, cost-effective calendar synchronization without relying on paid SaaS services.

Why it matters

It provides precise, reliable calendar sync while avoiding common issues like duplicate loops and excessive data syncing.