A plugin to add some sort of inbox-functionality to Craft CMS.
To check if a user has read the entry:
{% set isRead = craft.didread.user(currentUser).hasReadEntry(entry) %}
To mark the entry as read:
{% set asRead = craft.didread.user(currentUser).markAsRead(entry) %}
To mark the entry as unread:
{% set asUnread = craft.didread.user(currentUser).markAsUnread(entry) %}