There is no shortage of calendar apps for Android, each of which is looking for a way to set itself apart from the crowd. Lately I've settled in with Sunrise Calendar as my go-to, as it's just easy to use and provides all the features I want in a calendar. And it just got a little bit better.
As of version 1.3, it now syncs immediately with Google Calendar. When changes are made in any of the apps, on the web, or in the Chrome app, then it happens across all devices in real-time.