If you have connected a unique domain to your Wix account (which requires an additional fee or subscription), then you have the option of using Google Analytics to measure website activity.
Here is information on how to connect Google Analytics to your Wix site:
Please note that you will need to generate a unique tracking code associated with your Google Analytics account. Here is more info:
StatCounter allows you to track who is visiting your campaign site. By installing StatCounter code into your Wix.com site, you'll be able to see detailed information on your visitors.
To get started, visit http://statcounter.com. Sign up for a free account and then follow the instructions to generate and install tracking code.
Please note that two features of StatCounter are not available with Wix.com. You may not see accurate tracking for page titles and referring information.