Do you use brown noise to optimize workspace? Any recommendations for apps, playlists and videos?

I have a couple apps that I use regularly. Right now I'm listening to a radio station in Longyearben, Norway that plays old timey 45's through an app called Radio Garden. I also have one called White Noise that has white, brown, pink, etc. noise but also a distant train, croaking frog, forest rain, and a bunch more. These are both on an Android, but I'm sure they're also on iOS.