Disasters almost always arrive unexpectedly. But there are computer apps to help people prepare for disasters. Some apps alert users when a disaster has taken place. Other disaster apps can be used when people need rescue or other help. The free SirenGPS Mobile app connects users to emergency services at the tap of the screen. The app will let emergency workers know where the person in need is. The app works over cell networks. But it also works on Wi-Fi if cell networks are down after an emergency. Users can create a personal health report on the app to share with emergency services. This will provide information about medicines users take, allergies they might have and other medical information important to treatment decisions. Guardly is an app that can help keep people safer in places such as businesses and universities. This app permits workers and students to report about unsafe conditions, suspicious activity and more.