If you are like me and have a constant ringing in your ears, it drives you crazy to be in complete silence. It is worse at night when I am trying to go to sleep so I like having some kind of noise in the background. At home, my alarm clock has that functionality but when I am traveling, aSleep and Ambiance are my go to apps.
There are quite a few sounds to choose from like rain, beach, waterfall, bubbles, airplane cabin, night camp, garden, movie, meditation, voices, lullabies, etc.
You can set a timer and/or an alarm using the sound you have chosen. If you click the clock in the bottom corner it gives you a digital bedside clock, which you can change the color of the numbers to your own liking.
Highly recommend at $.99.