Best way to sync Calendars

[Logan Fast]

I own a triplex in Omaha and I am listing each apartment across multiple platforms as short-term rentals. Right now they are on Air Bnb and Homeaway, which I find to sync up nicely, but it doesn't look like this is the case when listing on Booking or Flip Key. I want to have as much exposure as possible by having it on more platforms, but I'm a little worried about double bookings. Is there a way to Sync up all the calendars to a master Google calendar or something similar? Or do I have to use a property management software like Guesty or Host Away if I want to list on all these platforms without manually updating for every booking?