We're showing off a bit with the pretty cool messenger we've built with WiX Code. It lets site members chat instantly with each other, has cool features such as 'press enter to send' and auto updates on either side so no page refresh is ever necessary.
It does have a few pre-requisites such as that users who are sending messages have to be site members, among a few others, but it also has the advantage of being fully customizable in terms of design look & feel. This specific one was build for an online tutoring service and has a cool feature where admin staff can easily review chats between students as a build in precaution and for peace of mind for parents.
Unfortunately the setup is not such that we can simply copy and paste the code as the structure is quite complex, but feel free to get in touch with us for a demo or grab a friend, sign up and test it out here: https://tiaanrich.wixsite.com/wix-code-messenger
Thanks for looking!