I use the my noise app and have done so for a long time. Has hundreds of cool soundscapes and randomized music for noise masking and relaxation. The dev totally redesigned the app about a year ago and the accessibility was so bad that the dev was nice enough to point me to the old app which they kept on the store. Wrote up a report to see if the guy could fix it to make it possible for us to change volumes of the 10 tracks etc. and use prefixes. Hadn't tried the new version in a while and surprisingly, it's been made way more accessible and all the things I asked about have been fixed. All sliders are labelled and draggable, no buttons are unlabelland. In the old app, you could adjust the soundscape, but you never used to know what you were adjusting. Goes to show you that some developers care, listen, and improve. Some don't for sure, many don't actually, but it's nice when they do. https://apps.apple.com/us/app/mynoise-the-soundscape-app/id1523675125