You can pick Brown Noise in the left column. You can also customize the sound itself.
Personally, I need to shift it a little to accommodate with my tinnitus to get the relaxing effect of white noise.
There is also a "Order as an Audio file" button on MyNoise where you can buy the result of a customized generator.
(Not directly associated to them, just a big fan and power user)
Open White Noise and Co, then tap “custom noise” and select Color. Brown is on the list.
You can pick Brown Noise in the left column. You can also customize the sound itself.
Personally, I need to shift it a little to accommodate with my tinnitus to get the relaxing effect of white noise.