White Sound Pro is the best app that can be used freely without downloading additional sound sources by collecting white noise that is known to be effective in many areas such as improving concentration, soothing baby and insomnia. White noise is a mixture of various frequencies, and sounds of nature such as rain, waves, waterfalls, etc. The effect stimulates hearing, relieves tension and gives a refreshing feeling that makes you feel good. Best of all, Easy to hear, neutralizes unwanted noise . Over a hundred high-quality sound sources are installed with the app and all the music sources are available without additional downloads. You can see a good effect in the following cases.  - When the area is too noisy for studying  - When you don't sleep well for insomnia  - When you are angry with the noise between floors  - When you are having a hard time with your baby's sleep (Please play softly at least 30cm away.) If you like this app, you can donate a cup of coffee :) https://www.buymeacoffee.com/coolsharp [Built-in sound list] - Rhythm and City and Nature - In the city - City night