At least 1 gb of server memory for Saas version. And shared-hosting is not a problem to use chat plugin. If you want to use Pro version, your website should be based on PHP 7+.
It took more than six months to develop and build the plugin. Voluminous and laborious work was done to ensure the stable functioning of all systems. You will save money and time by choosing ImbaChat because at least several months of work will be spent on the full development of such a service from scratch. By the way, SaaS version is free.
Of course, you can modify the code according to your needs. That's the main function we made this version for. If you will have any problems with modifying, our team is ready to help you.