I built an app using Google Apps Script to sync your Google Calendars. Events from a remote calendar show as busy in your local calendar and vice versa, helping prevent conflicts. No subscription — it runs in your own Google account using free-tier quota, with a one-time payment for script generation. Free access for the first 10 users in exchange for feedback. Log in and email me via the app to get access.
https://calendarsync.uk/
