Last updated: March 12, 2026
GCalSync is a Google Workspace Add-on developed by Twilight Coders LLC. We take your privacy seriously. This policy explains what data the Add-on accesses and how it is handled.
GCalSync accesses the following data through the Google Calendar API:
- Source calendar events: Event times, titles, descriptions, attendee lists, and status from the calendar you configure as your source
- Primary calendar events: Events on your primary calendar to identify previously synced entries
Accessed data is used solely to:
- Create, update, and delete "blocked" time entries on your primary calendar
- Determine which events match your configured filters (weekday, working hours, confirmation status)
- Apply your privacy preferences (hiding or showing event details)
- Configuration (source calendar ID, filter preferences, sync tokens) is stored in your Google Apps Script User Properties, which are scoped to your Google account
- No data is stored on external servers. The Add-on runs entirely within Google Apps Script
- No data is shared with third parties. Twilight Coders LLC does not collect, transmit, or have access to your calendar data
- Synced events remain on your primary calendar until deleted by the Add-on or by you
- Configuration is retained in your User Properties until you uninstall the Add-on or clear it manually
The Add-on requests the following OAuth scopes:
calendar— Read and write calendar events (required for syncing)calendar.addons.execute— Run as a Calendar add-onscript.locale— Detect your locale for timezone handling
We may update this Privacy Policy from time to time. Changes will be reflected in the "Last updated" date above.
For privacy questions or concerns, open an issue at github.com/TwilightCoders/GCalSync or email support@twilightcoders.net.