Contacts shown in the analytics tab of THRON intelligence are contacts who have performed at least one visit on content in the considered time interval, calculated in the moment you perform the request. This means that such data is always up-to-date.
Active contacts displayed in the Platform tab of the intelligence take into accounts not only those contacts who have performed visits on content, but all the contacts that in the month have performed a connection (e.g. a login).
For any further information on terminology we invite you to read this article.