My Safetipin (Android, iOS, Windows) is a free app that helps you take decisions based on the areas you are visiting, and help you safely reach your destination. A location is scored depending on how safe women found it. The app will send you alerts as soon as you in an unsafe area. The safety score is calculated using nine parameters, and the user contribution makes a big difference. The app will let a select group chosen by you even track your location.
Safetipin is already used in several cities in the world:
Sources: Safetipin