With Share Logins, you can sync different user actions across several websites. The syncs include signing in, signing out, changing profiles, resetting passwords, adding new users, and removing users.

It works based on the user’s login name or username. That means, if a user logs in to a site and his/her username is johndoe, it’ll look for the same username in another site (s) and if found, the user will automatically be logged in!