Green noise is a frequency of white noise. It reminds people of nature more than other frequencies (hence the description “green noise”). White noise, more broadly, contains all frequencies found in the spectrum of sounds that you can possibly hear, with equal parts of each, WebMD reports. White noise typically sounds like an air conditioner, vacuum, fan, or even an airplane engine, while green noise, a type of white noise, might remind you a bit more of soothing nature sounds from wind to water. Green noise is around a frequency of 500 Hz, Huffington Post reports.

Brown noise has a lower, deeper vibe, though it still contains every frequency like white noise. The New York Times describes it as soothing, steady, and rumbly, and notes that it made waves in online ADHD communities in 2022.

Psychologist and primary care physician Dr. Laura Purdy explains green noise as “ambient noise in nature, so some people do find it more soothing than brown noise.” She adds that it sounds distinct from other colors of noise, and is therefore more relaxing for troubled sleepers.

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