The app sets off a loud alert to scare off a would-be attacker.
It was developed by a Chicago man after a family member was the target of an attempted abduction.
When you find yourself alone and without protection, you could be a vulnerable target for predators.
You can now get a measure of security with lifeline response a mobile safety app available for smartphones.
Jessica Kuh, a Loyola University student who lives in the Edgewater community feels safe now that she uses the app.
"This has been a game changer for me. It has made me feel significantly safer when walking alone. I know I have my back if something were to happen," said Kuh.
Chicago businessman Peter Cahill's niece was the victim of an attempted abduction two years ago. He says he created the safety app because every second counts when you are in danger.
"Every second counts in a rape situation the rape starts commencing within two minutes and thirty seconds we hope we can dispatch someone within ten seconds of the attack starting," said Cahill, Lifeline Response.
To activate the app, you must create and enter a disarm code. Place your thumb on the phone screen and hold it. Once you remove it from the screen, a countdown begins. If the disarm isn't punched in, a siren will go off.
Your GPS location is immediately transferred to a center, which notifies police, trusted friends and family members. The app that lets you and the attacker know that help is on the way. It costs under $20 to download.
Kuh says the women in her sorority at Loyola University are using the app.
"Even when we are in groups together, I have been with multiple people using the app. It is a safety precaution," said Kuh.
For more information on the Lifeline Reponse app, visit: http://llresponse.com/