More info Noizio
Noizio is an app that will drown out the noise of the street and allow you to concentrate on the work at hand, increasing your productivity. On the other hand, it can also set the mood for a romantic evening or lull you to sleep, ensuring that you will dream soundly all night long. An ambient sound equalizer app for creating a mixture of ambient sounds available for Mac OS X.
Noizio for iOS — whole arsenal of sounds with you.
More than 30 available sounds of nature for better relaxation, meditation or increasing concentration right in your pocket.