A free program for Android, by CatalystLab.

White Noise for sleep is a powerful relaxing tool that helps you sleep better. The app includes various sounds of different categories, including natural, instrumental, and urban sounds.

The app offers an option to set a timer, so it will play for a defined period of time and then stop. Plus, you can play it in the background, which will not affect your device’s performance. And with a user-friendly interface is simple, it is definitely easy to operate.

Furthermore, the app is completely free, so you don’t have to worry about any hidden fees.