Hop on over to iTunes.com where you can score this popular White Noise App completely FREE! Note that this app requires iOS 7.0 or later and is compatible with iPhone, iPad, and iPod touch. And the audio plays in background so you can even use other apps while listening!
Here is just one review: I got this app free from Starbucks but would have gladly paid for it. It’s wonderful. I downloaded this app for those occasions when I’m in a strange place, like a hotel room. However, listening to this app is so relaxing I’ve been using it nearly nonstop since downloading it. I love so many of the sounds that are already loaded onto it and then I can easily add more by accessing the market. I’ve found just having some of these ambient sounds on in the background relaxes me no matter what I’m doing. I am so glad I have this app!