What a cool app! To quote their website. https://www.myallyapps.com/

“nightally™ lets you to size up the situation, distract and disarm a potential attacker or get the attention of bystanders (anyone near by) and get to a safe place—before something happens. Simply click nightally™ to activate it before you leave home or work. Should a problem arise, shake your iPhone to initiate the powerful nightally™ alarm, which includes a loud siren and a bright flashing light. nightally’s shake technology lets you pay attention to your surroundings, so you stay focused and never take your eyes off your assailant — a practice advised by streetproofing and self-defense experts. “

My niece is about to get a iPhone for her 16th birthday! I’m going to make sure that she gets this apps, plus a few other toys! J