You log in to a central site and pick up your assignment.
"Go to this web site, and do this." You go and do the assignment. all of you mouse clicks entries and screens are recorded and later shared with the web site owner.
Meanwhile someone else is assigned to ""Go to web site, (your web site)
and do this." They go and do the assignment. All of their mouse clicks entries and screens are recorded and later shared with you.
You can see what others see, and how they react to your site.
Surely this is baked, But I don't even know what to search for. Mostly wanted to use the phrase: I'll show you yours, if you show me mine.