Never Read is the app to help clearing the mountain of unread articles for you. It will save you from the pressure that a huge backlog of articles can have on you by deleting unread articles that are older than 30 days (or almost any other number of days you tell it to).
The idea is simple: If you haven't had time to read an article within the specified time it probably isn't interesting enough to you in the first place. The chance for you to ever going to read it trending towards zero. Never Read will delete those articles for you to give you peace of mind.