Service Level Agreement
You should not use Newtifry for any mission critical systems. Any use in mission critical systems is at your own risk, and no responsibility will be taken for any damage, missing notifications, or failure to respond.
Newtifry is a free service. As such, there is no guarantee that the service will work at any given time, as many different technologies and systems are involved, and any interuption in that chain will stop the system from working. For example, the Google App Engine backend could exhaust its assigned resources, or the GCM APIs could exceed their limits.
Newtifry will make the best effort to deliver your message, but we can not be held accountable for any failure to notify a user via the service.
It is recommended to back up any Newtifry system with an alternate notification system, such as SMS or email, depending on your desired urgency level.