To be able to use JustReact, you need to have a Google account or a Google Suite account and you need to have access to at least 1 Google Analytics account.
JustReact is simple to setup in just a few steps. It only takes 2 minutes to start your first JustReact Dashboard.
Segments are subsets of your Analytics data. For example, a segment might be users from a particular country or city or users who purchase a particular line of products or who visit a specific part of your site.