Within Localytics analytics reports, a user is defined as a unique device. For example, if a user opens the same app once on two separate devices- a mobile phone and a tablet - in Localytics this is noted as two distinct users. If a user only opens the app on one device but does so multiple times, this is noted as one user.
Localytics also exposes contextual information about users, such as whether they are new or returning. A user is considered new during their first session and returning during all subsequent sessions.
Localytics also allows your app to assign a known identity to users which can be used to power more targeted engagement campaigns; however, these identities are not used for the purpose of counting users within analytics reports. For more, see device and user identification.