Yes. The one-time, in-app purchase to activate/unlock our Plex for iOS app is compatible with Apple’s Family Sharing functionality. To make use of it:

1. The iOS device must be running iOS 14.0 or newer system software
2. Your Apple account (Apple ID) must be a member of a “family” in Apple
3. The one-time, in-app purchase must be made by the “admin” account for the family
4. Purchase sharing must be enabled for the family admin : Purchase sharing
5. When signed in to your member Apple ID, use the Restore Purchase button either on the activation screen or under Settings > Account in the Plex app

In rare cases, the family member may need to sign out of the Apple account (Apple ID) on their mobile device and then sign back in to pick up the permission changes.

Related Page: Unlocking or Activating Plex for iOS
Related Page: Apple: What types of content can I share with Family Sharing?
Related Page: Apple: About in-app purchases