The iOS application, Vigilante, was created to increase community participation in law enforcement. The idea behind the application was to alert citizens of nearby crimes in progress so that they could assist if possible. It also provided real time crime mapping.
The application was removed within 48 hours from the application store by Apple. Concerns were noted over liability and the encouragement of discrimination. These concerns were also echoed by the NYPD where the application had been launched.
This application was re-released under the name Citizen. It does still have the same features as the previous version. However, the creator of the application advised that he intended to remove some features to address previous concerns. The application is only available for users in New York City.