There's a few out there I only know UK ones. Anyone know others?

Hollie Guard is a brilliant app. You input a trusted person's phone number and if you're in trouble shake your phone hard. It sends a text with your location on it to your emergency contact.

Text register to 999 so you can text them if you need help but can't talk.

What 3 words is an app that has mapped every part of the UK and given it 3 words. Even if you're in the middle of a field it's got specific words for the bit of field you're in!

Also not an app but I love the Internet boyfriend skit you can play if you feel unsafe in an uber

Anyone got more?