White vs pink vs brown noise
Four noise colors, one question: which should you sleep to? Listen to each one here, see what it's good at, and use a simple three-night test to pick yours.
All four noise colors, generated live in your browser. Switch between them at the same low volume.
The one-minute version
All four are random, steady noise. What changes is where the energy sits, from deep bass to bright treble.
| White | Pink | Brown | Green | |
|---|---|---|---|---|
| Sounds like | TV static, a hissing radiator | Steady rain, wind | Waterfall at a distance, airplane cabin | A soft, mellow "shhh" |
| Energy | Equal at every frequency | Equal in every octave | Mostly low | Mostly middle |
| Feels | Bright, airy | Balanced | Deep, cozy | Light, neutral |
| Masks best | Voices, dogs, sharp sounds | A broad mix | Traffic, bass, footsteps | Light household noise |
| Common complaint | "Too harsh" | "A bit plain" | "Muffled" | "Hollow" |
Use the tiles above to switch between them. Keep the volume the same and low, and listen for a minute each. Your first reaction is useful information.
How the colors differ (without the math)
White noise gives every individual frequency the same energy. There are many more high frequencies than low ones in the range we can hear, so white noise ends up treble-heavy. That's why it sounds bright, and also why it's good at covering high, sharp sounds like voices.
Pink noise gives every octave the same energy instead. Since our hearing works in octaves, this sounds balanced to most people, much like steady rain. It's the usual "safe default". Read more on the pink noise page.
Brown noise drops off faster toward the highs, leaving a deep, rumbling sound. It's great at blending in low noise like traffic and a neighbor's TV, and many people find it cozy. It's named after Robert Brown, not the color. See brown noise for sleep.
Green noise isn't formally defined. It usually means noise focused on the middle frequencies, around 500 Hz. Think of it as a lighter, more open option for people who find brown too heavy and white too bright. More on the green noise page.
What the research does and doesn't say
It would be easy to promise that one color is scientifically best. It isn't that simple.
- A 2021 systematic review of noise as a sleep aid found the overall evidence low quality and mixed. Most studies tested "white" or broadband noise, not careful comparisons of colors.
- The pink noise "deep sleep" studies used short bursts timed precisely to the sleeper's brain waves in a lab. That's different from a continuous track, so those results don't carry over to everyday listening.
- There's essentially no good research on brown or green noise for sleep specifically.
So the honest answer is that the best color is the one you find comfortable and stop noticing. That's what the test below is for.
The three-night test
You don't need to overthink this. Try it like this:
Night 1: pink noise. It's the balanced middle, so it's a good reference point.
Night 2: brown noise. If pink felt a little bright or thin, brown is the step deeper.
Night 3: whichever fits your problem.
- Woken by voices or sharp sounds? Try white noise.
- Woken by traffic or rumbles? Stay with brown, or try heavy rain.
- Found both a bit much? Try green noise.
- Want something less artificial? Try rain.
Keep everything else the same on each night: same speaker, same position, same low volume, same bedtime. Then keep the one you noticed least.
Getting the volume right
The color matters less than the volume. A few rules:
- Set it low. Raise it only until the noises that bother you blend in. You should still be able to hear a normal speaking voice.
- Compare at the same loudness. Brown noise can seem quieter on a phone speaker because the speaker can't play much bass. Don't just turn it up; try a better speaker.
- Keep distance. An arm's length or more from your head, not under your pillow.
- Babies are different. A 2014 Pediatrics study found every infant sleep machine it tested could exceed 50 dBA at 30 cm at full volume. If you use noise for a baby, keep it quiet and far from the crib, and follow your pediatrician's advice.
Mixing colors and sounds
You aren't limited to one. Some combinations that work well:
- Brown under rain for a steadier, deeper rain.
- Green under a fan sound to soften the motor hum.
- Pink alone when you want nothing to notice at all.
If you want sound to last all night without a screen glowing or ads breaking in, read how to play sleep sounds all night with the screen off.
Questions
Which noise color is best for sleep?
There isn't a single best one. Research comparing noise colors for sleep is limited, and preferences vary a lot. White noise masks sharp sounds best, brown noise covers low rumbles and feels deeper, and pink noise is a balanced middle ground. Try each at a low volume for a night or two.
Why does white noise sound so harsh?
White noise has equal energy at every frequency. Because most audible frequencies are high ones, that puts a lot of energy in the treble, which our ears hear as hiss. Pink and brown noise reduce the highs, so they sound softer.
Is brown noise the same as red noise?
Yes. Brown, red and Brownian noise are names for the same thing: noise whose power drops about 6 dB per octave. The 'brown' comes from Robert Brown and Brownian motion, not the color.
Is a fan the same as white noise?
Not exactly. A fan makes broadband noise with its own character, usually somewhere between pink and brown, plus a hum from the motor. Many people like fan sounds for the same reason they like noise: a steady background that covers other sounds.
Sources
This page is general information about sound and sleep habits, not medical advice. If poor sleep is affecting your days, talk to a doctor or a sleep specialist.