I'm using Red Sift's free version .. I understand they have a paid service also .. however they are so far off on listing the expired and expiring it's insane .. They are reporting 7 certificates expired today that actually expire in July ..
Even if they are pushing people to the paid version this is horrible marketing behavior .. why would I want to pay for a service that can't even get close ?
I think that the letsmonitor.org service should be buffed up slightly and used instead.