Android: Relax and Sleep is a free sound-generator for Android phones that makes it easy to create custom sleep soundtracks.
Relax and Sleep sports dozens of tracks you can mix together to create a custom sleep soundtrack. Mix sounds like city noise, crickets, music, white noise, the sounds of fans, air conditioners and more. You can adjust each track individually so the crickets don't overpower the thunderstorm or vice versa. Once you've mixed your perfect track, save it to one of the preset slots and then set the timer to count down to nod off time.
Relax and Sleep is free and works wherever Android does. Hit up the link be below to read more and grab a copy.