CalendarSync – Secure busy-slots synchronization for Google calendars

Summary: CalendarSync uses Google Apps Script to sync events between Google Calendars by marking busy slots reciprocally, preventing scheduling conflicts. It operates within the user's Google account under the free-tier quota, requiring only a one-time payment for script generation.

What it does

It synchronizes events from a remote calendar to appear as busy slots on the local calendar and vice versa, ensuring mutual visibility of busy times.

Who it's for

Users needing to coordinate multiple Google Calendars to avoid overlapping events.

Why it matters

It reduces scheduling conflicts by clearly showing busy times across synced calendars without ongoing subscription costs.