Any easy service for Google contacts sync?

5
22

I have 2 different gmail accounts, and what I would like to do is keep the contacts synced between them both automatically. At the moment if I add a new contact I have to copy/paste the details to the other account.

I rarely remove contacts so it is more or less just to make any contact I add to one account appear in the other. An added bonus would be if I could then sync the contacts to my mailchimp account!

Most of my research so far points to a service called soocial which is now discontinued.

Any suggestions appreciated!