a plain-english guide to noise colors (white, pink, brown, blue)

what even are "noise colors"?

the idea of noise colors is a bit like light colors. think about a rainbow: different colors of light are just different wavelengths on the electromagnetic spectrum. with sound, "noise colors" describe how a sound's energy is distributed across different frequencies.

it's not about actual colors you can see, of course. it's a way to categorize different types of broadband noise, which is sound that covers a wide range of frequencies. each "color" has a unique frequency profile that gives it a distinct sound and, for some people, different effects on focus and relaxation.

white noise: the classic masker

imagine tuning an old tv to an unused channel and hearing that steady, high-pitched hiss. that's basically white noise. technically, white noise has equal energy across all audible frequencies, from the lowest rumbles to the highest squeals. because of this even distribution, it can sound quite harsh or static-like to some people.

its main superpower is masking. because it covers such a broad spectrum, white noise is great at covering up sudden, jarring sounds like a dog barking, street traffic, or your office mate's phone calls. by creating a consistent, unchanging soundscape, it can help your brain filter out distracting external stimuli.

research from stockholm university by söderlund & sikström has explored how white noise might improve attention in people with ADHD, often framed by their moderate brain arousal model. a 2024 systematic review and meta-analysis from Oregon Health & Science University (OHSU) pooled these studies, finding mixed but often promising results for some individuals. it's not a cure, but a tool worth trying.

pink noise: the gentler cousin

if white noise is a harsh static, pink noise is more like a steady, gentle rainfall or the soft rustling of leaves. its energy isn't evenly distributed; it decreases by about 3 dB (decibels) for every octave increase in frequency. this means it has more energy in the lower frequencies and less in the higher ones.

the result is a deeper, more natural, and often less jarring sound than white noise. many people find it easier to listen to for extended periods. it can still be effective for masking distractions, but in a way that feels less intrusive. some anecdotal reports suggest pink noise might also be good for sleep, though the scientific data on this is still quite thin.

think of it as white noise's mellow older sibling, who figured out how to chill out a bit. it still gets the job done of blocking out the world, but with a softer touch.

brown noise: the deep rumble

now we're getting into the deep end. brown noise (sometimes called red noise) has even more energy in the lower frequencies than pink noise, with its energy decreasing by 6 dB per octave. it sounds like a powerful, deep rumble, similar to a strong waterfall, distant thunder, or the very low roar of heavy ocean waves.

this depth can be incredibly grounding and calming for many people. it's become quite popular on platforms like TikTok and YouTube, with many sharing how it helps them achieve a deep state of focus or relaxation. for some, the intense low frequencies can effectively block out a wide range of ambient sounds, creating a very insulated auditory environment.

it's a favorite for many with ADHD who report it helps quiet their busy minds and provides a consistent, soothing background to concentrate. while much of the evidence is still anecdotal, the widespread positive response speaks for itself. your brain might just really appreciate a good rumble.

blue noise and violet noise: the high-pitched ones

while white, pink, and brown noise are the big three for focus and relaxation, you might occasionally hear about blue noise and violet noise. these are essentially the opposite of pink and brown noise.

blue noise has its energy increasing by 3 dB per octave, meaning it's heaviest in the higher frequencies. it sounds like a high-pitched hiss or static, similar to the sound of spraying water or maybe the static from a broken radio tuner. it's generally not considered pleasant for focus or sleep and is more often used in audio engineering for things like dithering.

violet noise is even more extreme, with its energy increasing by 6 dB per octave. this makes it even higher-pitched and harsher than blue noise. you probably won't find anyone recommending these for your next focus session, unless you're trying to annoy your cat (don't do that).

choosing your color: it's personal

there's no single "best" noise color for everyone. what helps one person achieve deep work might be incredibly distracting to another. your brain is unique, just like your preference for pineapple on pizza (don't judge, it's a thing).

for many, the goal of using noise colors for focus is to create a consistent, predictable auditory environment. this consistency can help mask unpredictable background noises that might pull your attention away. for ADHD brains, this consistent input can sometimes help provide just enough stimulation to settle down and focus, a concept explored by researchers like Russell Barkley and Thomas Brown in their work on executive function.

the best way to find out what works for you is to experiment. try out white, pink, and brown noise for different tasks and at different times. pay attention to how each sound makes you feel and how it affects your ability to concentrate. you might even find that your preference changes from day to day or task to task.

ultimately, noise colors are just another tool in your focus toolbox. they offer a simple, often effective way to create a more conducive environment for concentration, without any of the hype or promises of a miracle cure.

you can try out white, pink, and brown noise for free right on the focus cave homepage.