In the Activity page of the data dashboard you will see we refer to "active users"
Active users refers to the number of users who have undertaken any sort of activity (including simply opening the app) during a time period
Measuring active users by time period and user group
If you navigate to the Activity pane in the Analyse menu then you will see your total active users. The default view shows you the number of active users in the Last 28 days for the registered user group. The registered user group includes all registered users on your Learn.ink app. You can click on these dropdown menus to change the timeframe and filter by user groups.