Safe Calls enter the 21st century

[desertslave]

I don't know if this is old news, but I just heard about it from a friend on FB. I think this is a very smart app and, while not perfect, has the potential to be much more effective than the traditional safe call. Smart kids, the developers!

http://companionapp.io/

 

[Cumference]

For someone who has never heard about it: what is it?