Let me humbly suggest that people use actual files for their noise needs. The two apps that work in tandem are syncthing and vlc. Syncthing gets the file from a desktop to your phone. VLC lets you play the file on your phone. (Getting a file to your desktop is another tool, but that depends on your source. For generating noise Audacity works great! But you can also rip CDs, and so on.)
It feels very wholesome about playing a simple file, rather than streaming it. This is apart from the considerable simplicity and robustness of the solution. You can be on airplane mode and it will work. You can use VLC player features to speed up, slow down, or loop it. You can build up a play list rather than using search all the time. My phone sips power compared to streaming music. It also doesn't use your network bandwidth, which is nice.
It feels very wholesome about playing a simple file, rather than streaming it. This is apart from the considerable simplicity and robustness of the solution. You can be on airplane mode and it will work. You can use VLC player features to speed up, slow down, or loop it. You can build up a play list rather than using search all the time. My phone sips power compared to streaming music. It also doesn't use your network bandwidth, which is nice.
Note: you could also build your own noise tracks on your phone with a mobile DAW. I like https://www.image-line.com/fl-studio-mobile/ - it's $15 but quite powerful.