A free program for Android, by Leanderoid Development – Audio Productivity.

Ocean Sounds for Sleep and Focus is a powerful app for anyone who needs to get some rest or focus. The app uses a combination of soothing ocean waves and other relaxing sounds to help you relax and get a good night’s sleep. It has a built-in timer so that you can set the time to stop playing.

Ocean Sounds for Sleep and Focus has a built-in music player so that you can play your favorite songs or mix it with the waves. You can also add your own background music or even use the app’s built-in white noise generator. The app also has a built-in vibrator to create even or varying waves. The app can be particularly useful for masking low-frequent sounds from thumping noise or bass from your neighbors.