"KNOW THEY KNOW." Know who got your message, and who didn't, in real time.
AUTOMATIC ESCALATION. When some don't respond, Notifier can automatically re-send your message, try different methods, and even try other people, until everyone is notified.
NO MORE GATHERING EMAIL ADDRESSES AND PHONE NUMBERS. Your group can manage that themselves, and keep it completely private.
NO ADVERTISING. We do NOT scan or read anyone's communications, we're not even in the advertising business.
(Optimized for Android 4.0 and higher.)