I discovered this feature a little while ago and find it useful for focusing. The extra nice thing is that it can play simultaneously with video or audio. So if you want to watch a show, it will continue to play background noise.

Sharing this here since I understand many ND people (particularly ADHD) benefit from background noise. Not sure if there is an Android equivalent for this. There are the sleep sounds in the Clock app, but that’s not quite the same.