Because I have significant ringing in my ears, I have to have something playing in the background at night to block it out. I have tried a few different "white noise" apps like aSleep, White Noise and Ambiance but Relax Melodies is unique in that you can build your own sounds. Some of the choices that aren't shown are Zen, Campfire, Waterfall, Thunder, Slow Waves, Heavy Rain, Wind Chimes and Underwater. There are more and if you upgrade to the Pro, you have even more choices.
On another screen there are Meditation options. I haven't really gotten into those but may give it a try.
The Favorites screen allows you to store your own favorite sounds that you build OR try one from the community board.
Times is what it says. You can set an alarm, shut the sound off after a certain amount of time, use the app as a nightstand clock or set up a bedtime reminder (which I never need - I love sleep).
The Pro version is currently $19.99 (one-time purchase). I don't know that I would need that but it might be worth it down the road.
Being that it is a free app, I highly recommend if you are looking for a good sleep app.