"We require location to use the app only to extent to know what your location to make sure something critical is happening near you," said Praveen Arichandran, Head of Growth Citizen.
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It's called "Citizen."
It's completely free for you to download.
The app works with the 911 system to alert you of any emergency, based on your GPS location.
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It also allows you to interact, to give updates on what's happening in real-time.
Emergency responders can also use the information to help formulate a plan of attack.
It's only available in the city of Philadelphia right now, but Citizen plans to expand coverage in the near future.