I'm a little confused by how this actually integrates with email. What will I see in my email when I use flowcontrol.io? What isn't in my email that requires go

I'm a little confused by how this actually integrates with email. What will I see in my email when I use flowcontrol.io? What isn't in my email that requires going to the website to use? If I sign up, do my collaborators need to sign up as well? The more new technologies I'm exposed to, the more reluctantly I approach them. I think the idea can work - do more with email. But I want to know a little more before I sign up. That being said, I'm in the middle of a bylaws review with an organization I'm a part of. This may be a helpful tool, and I'll try it out.