Lifeline Response allows users to set up an alert system that dials up personal contacts and 911.
This app has MTV's April Rose, a Maxim model, as it's celebrity spokesperson, who revealed her own experience of being assaulted by an acquaintance on a date when she was 17.
"You can't understand sexual assault fully unless you've lived it," the New York Post quoted Rose as saying.
"It's like describing what love is: You can't do it unless you've experienced it," she added.
The app's alarm goes off at a preset time if the user hasn't canceled it, and after seven seconds, an audible alarm goes off, warning the assaulter that help is on its way, the paper said.