Free Version: https://play.google.com/store/apps/details?id=timsina.djrelax.lite.prabin

Relax Sound Maker Pro (DJ Relax) helps you mix different sound effects and create natural sounds for meditating and relaxing. Boost your creativity, productivity and concentration with these sounds. Sleep better and wake up with full energy.

The simple interface makes it really easy to create sounds in an instant. You will be able to quick save your sounds. You can also use a sleep timer.

Once you purchase, you will get lifetime updates for free.

Credits: https://www.dropbox.com/s/2t2nydl7ttin7if/credits.txt?dl=0