Informant for macOS can access your native Apple Calendar data on your Mac. Option 2: Setup Your Google Calendar on your Mac Follow the setup Instructions in the app.Click the “+” button on the bottom of the Account list.Click Informant menu>Add Sync Account….Step 3: Setup Google Calendar Account within Informant Step 1: Download & Install Informant for macOS Using Informant for macOS and Informant Sync Service Option 1: Setup Your Google Calendar on your Mac