The difference is spectral shape. White noise carries equal power in equal-width frequency bands. Pink noise carries equal power per octave. Brown noise falls more steeply toward the high end, leaving a deeper sound.
The colour names are analogies, borrowed from light. They describe a pattern across many frequencies, not a single pitch and not a wellness category.
Switch between the three and notice brightness, depth and how much attention each demands.
01 / Bright and even
White noise
White noise gives equal power to equal slices of frequency. Human hearing spans octaves rather than equal-width bands, so this balance can sound bright or hiss-like.
It is often used to mask irregular sounds because its broad spectrum fills much of the audible range. That can make a nearby interruption less distinct; it can also feel intrusive in a quiet room.
Generated broadband noise, set to the same low starting volume as the other samples.
02 / Softer by octave
Pink noise
Pink noise reduces energy as frequency rises, giving equal power to each octave. The high end is less prominent than in white noise, which many people hear as smoother.
“Smoother” is a description, not a result. A softer texture may suit one listener while another prefers the stronger masking of white noise.
The same generated source, balanced differently across the spectrum.
03 / Deep and weighted
Brown noise
Brown noise—named for Brownian motion, not the colour—loses more energy as frequency rises. The result is a low, rumbling texture.
Online descriptions sometimes attach specific mental or physical outcomes to brown noise. Direct evidence for those claims is limited. The reliable distinction is acoustic: brown noise sounds deeper.
Choose it because the texture feels comfortable, not because it promises a result.
A two-minute comparison
Choose with your ears, not a hierarchy.
- Set the volume lower than you think you need.
- Listen to each colour for about 20 seconds without doing another task.
- Notice which one fades into the room rather than pulling your attention.
- Then test that one in the actual setting where you might use it.
The useful choice may change with the room. A sound that covers traffic at midday may be unnecessary late at night.
Evidence position
Research does not name a winner.
A 2022 systematic review found positive sleep results in some white-, pink- and mixed-audio studies, but no strong overall evidence supporting auditory stimulation for sleep. A separate review rated evidence for continuous broadband noise as very low quality and noted that sound may sometimes disrupt sleep or affect hearing.
The honest conclusion is narrower than most “best noise” lists: these colours are meaningfully different sounds, and low-volume personal comparison is reasonable. Their names do not predict a universal outcome.
Method and limits
The samples are generated in-browser and are intended for comparison, not acoustic calibration. Device speakers and headphones reproduce low frequencies differently. Reviewed 21 September 2026 by Welnific Editorial.