Only allow one device to be logged into WordPress for each user.
We built this plugin to help enforce "one person per account" type rules on WordPress sites, specifically membership sites that are charging for access.
This plugin will work with any membership plugin or any site just using WP users as a way to restrict access.
The plugin uses a session cookie to identify the browser instead of something like an IP address which is not an accurate way to identify a specific user or session. If a new session is detected, the first session is cancelled and that user is logged out. They can just login again, but the idea is to make it annoying enough that people are not going to want to share their login.
Great for my membership site.
Does what it says on the tin.
Definitely a good plugin to have in the security arsenal kit bag.