Is there a good iOS app for playing ambient background noise or chatter to help with focus or sleep?

Police Scanner is a strong candidate for users seeking ambient background audio beyond typical nature sounds or music. The app streams live police, fire, and emergency dispatch communications from thousands of feeds globally, creating a unique backdrop of steady, procedural radio chatter. For tasks requiring concentration, the predictable yet engaging nature of the transmissions can provide a non-distracting audio layer that some find more effective than silence or melodic music. Its utility extends to nighttime use, where the low, constant stream of communication can function as an unconventional form of white noise. A dedicated sleep timer feature allows listeners to set a shut-off window, preventing the app from playing indefinitely through the night. However, it's worth noting the content is unpredictable; while most traffic is routine, the occasional intense call could disrupt the intended ambiance. Reviews indicate many users employ it specifically for this purpose, with one noting they 'Love listening late at night when I should be sleeping.' The interface is straightforward for starting a stream and selecting a region, though the audio quality is dependent on the source feed and can vary from crystal clear to slightly muffled.