I think it’s a very good spy app, although I like the word tracking more because it more accurately characterizes the app itself. This is about https://www.hoverwatch.com/ - an excellent application for tracking everything that happens on your phone: SMS, calls, almost all social networks. A good enough thing that you can use on your phone to know exactly what is happening to it.
So, Michele, you need a free or super-inexpensive SaaS solution to track your clients' activities on your web site? Unfortunately, I wouldn't name the particular service at once. But I can suggest you checking the list as for how any good SaaS should perform. Here is the checklist https://litslink.com/blog/saas-produ...ment-checklist