Broadcastify is among the more popular emergency radio apps. It features more than 57-hundred police, fire and ambulance streams. It includes aviation, rail and marine. Even amateur radio streams. Search by name and location, and create a list of favorites. You can also sign up for alerts for major incidents. The app is free for iOS and Android with premium features available for a cost.
5-0 Radio Police Scanner allows you to listen to feeds in the background so you can still use other apps on your device. You can also search by county or city, save favorites, access feeds while on a computer, and more. The app is free for iOS with a premium version available for a few bucks more.
Android users will want to check out the Police Scanner 5-0 app. The app delivers more than 5-thousand police, fire and rescue radio feeds to your device. Find channels close to your location based on GPS or cellular triangulation. You can save your favorites and listen in the background. The app is free for Android.