We paid for the Pro version because we wanted the calendar sync option. It does sync but has a major glitch. Every time the app syncs the calendar, it adds previously synced events again. So you end up with the event listed 3 or 4 times, which is really annoying. I would contact the developer directly but the email feedback button in the app doesn't and there is no link on the website either. So, please fix, this was too expensive to have these kind of issues.