Tautulli

Tautulli is a companion dashboard for Plex Media Server that collects and visualizes viewing activity. It tracks plays per user, per media type and per day, keeps watch history and library statistics, and can send notifications when a stream starts or a new title is added.

Plex administrators use it to see who is watching what, to find content nobody has touched, and to keep an eye on the health of the server.

Because the tool reads from your own Plex instance and stores its history locally, the data stays on your infrastructure, there is no subscription attached to the reporting, and the database can be snapshotted and restored whenever you want.