Mindspace · Coloured Noise
Coloured Noise: White, Pink, Brown and Every Shade In Between
Ten noise colours, explained and built to listen to instantly
Coloured noise describes how a sound's energy is spread across the frequency spectrum — from the flat, even hiss of white noise to the deep rumble of brown, and every shade in between. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford, blending original ambient music, nature soundscapes, binaural beats, solfeggio frequencies and sound healing experiences to support better sleep, less stress, effortless relaxation, beautiful meditation and mindful living. This page collects ten coloured noise samples — white, pink, red, brown, blue, violet, grey, green, orange and yellow — each built to generate and verify its real spectrum live in your browser, alongside what it's commonly associated with by the wellbeing community.
In summary: coloured noise spans ten distinct spectral profiles — scientifically verified slopes for white, pink, red, blue and violet, and descriptive wellbeing-community conventions for grey, green, orange, yellow and black — each explorable and audible directly on this page.
Mindspace · For Parents
Why White Noise Works for Babies and Young Children
White noise is one of the most searched-for sleep aids for babies, and it's also one of the better-understood ones. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; here's what the evidence actually says, and what you can do tonight — safely.
Reason One
It echoes the womb
Inside the womb, a baby hears a continuous, fairly loud whoosh of blood flow and muffled sound — not silence. A steady white noise texture is commonly described by pediatric sleep specialists as recreating that familiar, unbroken backdrop, which may help newborns settle into an unfamiliar, much quieter world.
Reason Two
It masks the sounds that wake babies
A closing door, a sibling's footsteps, a car outside — sudden sounds like these can trigger a baby's startle reflex and interrupt sleep. A steady, unchanging noise floor makes those sudden changes far less noticeable, which is the main mechanism researchers point to for why it helps babies stay asleep, not just fall asleep.
Which Colour for Babies?
White noise is the one to reach for. It's by far the most extensively studied noise colour for infant use. Pink and brown noise are popular with adults and anecdotally with some parents, but they haven't been specifically studied for infant sleep the way white noise has — so for a baby, white noise is the evidence-backed choice, not a guess.
Tap to Compare: How Loud Is "Safe"?
The American Academy of Pediatrics' commonly cited guidance is to keep infant sound machines at or below roughly 50 decibels, placed at least 7 feet from the crib. Here's what that actually sounds like next to.
Tap any point above to see why it matters.
Tonight's Action Steps
A Note for Parents, From Mindspace
Mindspace isn't a certified infant sound machine, and the samples on this page are built for adult listening rather than infant safety standards. If you're caring for a newborn through late-night feeds and need something calming for yourself, our white and pink noise samples make a gentle backdrop for you — while a dedicated infant sound machine, used at the volume and distance above, remains the better-suited choice for your baby's own sleep space.
Explore Mindspace for your own wind-down →This section is provided for general educational purposes only and is not medical advice, diagnosis, or treatment. Sound machine guidance referenced here reflects commonly cited American Academy of Pediatrics recommendations and published infant sound-machine research; individual needs vary. Please consult your pediatrician for guidance specific to your child.
Mindspace · Find Your Sound
Which Coloured Noise Is Right For You?
Ten quick questions. One recommendation, built from everything you answer — not just the last question.
Question 1 of 10
White Noise
Flat power spectral density across all frequencies.
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · White
White Noise
White noise carries equal energy across every frequency in the audible range — the flattest, most neutral of all the coloured noises. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, sustained white noise is commonly described as fading into the background of awareness, leaving a steady, neutral hush that makes sudden sounds — a door, traffic, a voice in another room — less likely to break concentration or interrupt sleep. This is a widely shared listening experience within sound-wellbeing culture rather than a clinical finding, and the effect is reported to vary from person to person.
Spectral Slope
0.00 dB / octave
Classification
Verified power-law noise colour
Flat power spectral density is the settled scientific definition of white noise, not a wellness-culture claim — see the live spectrum analyser in the player below for a real-time demonstration in your own browser.
Mindspace Recommends
Use white noise alone as a steady, unchanging backdrop for focus, or layered beneath a broader soundscape when a softer texture feels more comfortable.
In summary: white noise is a scientifically flat noise colour, commonly associated by the wellbeing community with masking distraction and supporting steady focus or sleep onset.
Pink Noise
Power spectral density inversely proportional to frequency (1/f).
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Pink
Pink Noise
Pink noise places more weight on lower tones than white noise, with power spectral density inversely proportional to frequency (1/f) — a gentler, less hissy texture that many describe as sounding like steady rainfall. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, sustained pink noise is commonly described as smoother and less fatiguing to the ear over long listening sessions than white noise, with several listeners describing it as feeling closer to natural rainfall. This reflects popular sound-wellbeing culture rather than a clinical finding, and the effect is reported to vary from person to person.
Spectral Slope
-3.01 dB / octave
Classification
Verified power-law noise colour
A −3.01dB/octave roll-off (equal energy per octave, 1/f) is the settled scientific definition of pink noise — not a wellness-culture claim. See the live spectrum analyser in the player below for a real-time demonstration in your own browser.
Mindspace Recommends
Use pink noise as a gentler alternative to white noise for sleep or wind-down, or layered beneath a nature soundscape for extra texture.
In summary: pink noise is a scientifically verified −3.01dB/octave noise colour, commonly associated by the wellbeing community with gentler, rain-like steadiness and easier sleep onset.
Red Noise
Scientifically synonymous with brown noise -- same 1/f² spectral density, different naming convention (light-wave analogy).
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Red
Red Noise
Red noise is scientifically synonymous with brown noise — the same 1/f² spectral density, decreasing 6.02dB per octave — but the name comes from a separate convention: a white-light/white-noise analogy where lower frequencies are likened to the red end of the visible spectrum. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, red noise is used interchangeably with brown noise in most sleep and relaxation contexts — the naming difference reflects which analogy (colour of light vs. Brownian motion) a particular resource happens to use, rather than any difference in the sound itself. This reflects popular naming convention rather than a clinical distinction.
Spectral Slope
-6.02 dB / octave
Classification
Verified power-law noise colour
A −6.02dB/octave roll-off (power spectral density proportional to 1/f²) is the settled scientific definition shared by red and brown noise — not a wellness-culture claim. See the live spectrum analyser in the player below for a real-time demonstration in your own browser.
Mindspace Recommends
Use red noise identically to brown noise — as a deep, steady overnight backdrop, or layered beneath a softer textural soundscape.
In summary: red noise is scientifically identical to brown noise (−6.02dB/octave), commonly associated by the wellbeing community with a deep, enveloping low-frequency listening texture.
Blue Noise
Power spectral density directly proportional to frequency (f).
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Blue
Blue Noise
Blue noise (also called azure noise) carries more energy at higher frequencies, with power spectral density directly proportional to frequency — the mathematical opposite of pink noise, and a brighter, airier texture. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, blue noise is used far less often for sleep or wind-down than the darker noise colours, and more often explored for its bright, energetic character or in technical audio contexts. This reflects popular sound-wellbeing culture rather than a clinical finding, and listener preference varies considerably.
Spectral Slope
+3.01 dB / octave
Classification
Verified power-law noise colour
A +3.01dB/octave rise (power spectral density proportional to f) is the settled scientific definition of blue noise — not a wellness-culture claim. See the live spectrum analyser in the player below for a real-time demonstration in your own browser.
Mindspace Recommends
Use blue noise sparingly and at a low volume, given its brighter character — better suited to short daytime sessions than overnight listening.
In summary: blue noise is a scientifically verified +3.01dB/octave noise colour, commonly associated by the wellbeing community with a bright, energised listening quality rather than sleep support.
Violet Noise
Power spectral density proportional to frequency squared (f²) -- the derivative of white noise.
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Violet
Violet Noise
Violet noise (also called purple noise) is the mathematical derivative of white noise, with power spectral density proportional to frequency squared — the brightest and least common of the classic noise colours, weighted almost entirely toward the highest frequencies. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, violet noise is the least commonly used noise colour for relaxation or sleep, given how concentrated its energy is in the highest, sharpest frequencies. It's more often encountered in audio engineering and dithering contexts than in wellness listening. This reflects popular sound-wellbeing culture rather than a clinical finding.
Spectral Slope
+6.02 dB / octave
Classification
Verified power-law noise colour
A +6.02dB/octave rise (power spectral density proportional to f²) is the settled scientific definition of violet noise — not a wellness-culture claim. See the live spectrum analyser in the player below for a real-time demonstration in your own browser.
Mindspace Recommends
Approach violet noise as a curiosity rather than a relaxation tool — keep volume low given its concentration of high-frequency energy.
In summary: violet noise is a scientifically verified +6.02dB/octave noise colour, rarely associated by the wellbeing community with relaxation, more often explored in technical audio contexts.
Grey Noise
Psychoacoustically shaped (not a simple power law) to sound roughly equally loud across the audible spectrum, approximating the inverse of human equal-loudness contours. The dashed line below is this sample's own constructed design target (+0.46dB/octave) — not an established scientific standard, since none exists for this colour.
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Grey
Grey Noise
Grey noise is shaped to sound roughly equally loud across the audible spectrum to the human ear, approximating the inverse of human equal-loudness contours — a psychoacoustic shaping rather than a simple power-law slope. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, grey noise is described as sounding more evenly balanced across pitches than white noise, since it's shaped around how the human ear actually perceives loudness rather than raw energy. This reflects popular sound-wellbeing and audio-engineering culture rather than a clinical finding.
No single agreed spectral standard exists for this noise colour — description reflects wellbeing-community convention, not verified science.
No single agreed spectral standard exists for this noise colour — it's an approximation of inverse equal-loudness shaping, not a simple power-law definition. The player below still lets you generate and inspect its real measured spectrum for yourself.
Mindspace Recommends
Use grey noise where a more balanced-sounding alternative to white noise is wanted, particularly for longer listening sessions.
In summary: grey noise is a psychoacoustically shaped noise colour with no single agreed spectral standard, commonly associated by the wellbeing community with balanced, non-fatiguing listening.
Green Noise
Energy concentrated around the ~500Hz band -- commonly described as 'the background noise of the world' -- a bounded region rather than a simple power-law slope. The dashed line below is this sample's own constructed design target (-3.47dB/octave) — not an established scientific standard, since none exists for this colour.
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Green
Green Noise
Green noise concentrates its energy around the ~500Hz band — commonly described in sound-design culture as 'the background noise of the world,' evoking the ambient hum of nature rather than a simple power-law slope. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, green noise is described as evoking natural, outdoor ambience — something closer to standing in a quiet, open landscape than a mechanically generated sound. This reflects popular sound-design and wellbeing culture rather than a clinical finding, and personal association varies.
No single agreed spectral standard exists for this noise colour — description reflects wellbeing-community convention, not verified science.
No single agreed spectral standard exists for this noise colour — it's commonly defined as a bounded, midrange-weighted band rather than a simple power-law. The player below still lets you generate and inspect its real measured spectrum for yourself.
Mindspace Recommends
Use green noise as a nature-adjacent backdrop for grounding or outdoor-style ambience, on its own or layered beneath a soundscape.
In summary: green noise has no single agreed spectral standard, but is commonly associated by the wellbeing community with grounding, nature-adjacent ambience centred around the midrange.
Orange Noise
No formal DSP standard exists. Commonly described as a low-energy, quasi-stationary sound clustered around musical-scale frequencies. The dashed line below is this sample's own constructed design target (-8.66dB/octave) — not an established scientific standard, since none exists for this colour.
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Orange
Orange Noise
Orange noise has no formal DSP standard — it's commonly described as a low-energy, quasi-stationary sound clustered around musical-scale frequencies, sometimes likened to the sound of an out-of-tune ensemble. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, orange noise is one of the least commonly used noise colours for relaxation, given its unusual, quasi-musical clashing quality. It's more often explored in sound-design or experimental listening contexts than as a sleep or focus aid. This reflects niche sound-design culture rather than a clinical finding.
No single agreed spectral standard exists for this noise colour — description reflects wellbeing-community convention, not verified science.
No single agreed spectral standard exists for this noise colour — the description reflects a niche sound-design convention, not a scientific claim. The player below still lets you generate and inspect its real measured spectrum for yourself.
Mindspace Recommends
Approach orange noise as a listening curiosity rather than a relaxation tool — most listeners will prefer brown, pink, or grey noise for sleep or focus.
In summary: orange noise has no formal spectral standard, and is rarely associated by the wellbeing community with relaxation, more often explored as a sound-design curiosity.
Yellow Noise
No formal DSP standard exists. Commonly described as emphasising the higher-midrange for a bright, stimulating tone. The dashed line below is this sample's own constructed design target (+2.41dB/octave) — not an established scientific standard, since none exists for this colour.
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Yellow
Yellow Noise
Yellow noise has no formal DSP standard — it's commonly described as emphasising the higher-midrange for a bright, stimulating tone, more associated with daytime alertness than sleep. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, yellow noise is generally reached for during the day rather than at bedtime, with listeners describing it as more stimulating and less suited to winding down than the darker noise colours. This reflects popular sound-wellbeing culture rather than a clinical finding.
No single agreed spectral standard exists for this noise colour — description reflects wellbeing-community convention, not verified science.
No single agreed spectral standard exists for this noise colour — the description reflects informal wellness-culture usage, not a scientific claim. The player below still lets you generate and inspect its real measured spectrum for yourself.
Mindspace Recommends
Use yellow noise during the day for an energising backdrop rather than at bedtime, where a darker noise colour will typically suit better.
In summary: yellow noise has no formal spectral standard, and is commonly associated by the wellbeing community with daytime brightness and alertness rather than sleep support.
Black Noise
An extremely low, sub-bass-weighted rumble at a constant level -- deeper than brown/red noise. No official DSP standard exists, but this construction is a double-integrated random walk, roughly twice brown noise's roll-off. The dashed line below is this sample's own constructed design target (-11.99dB/octave) — not an established scientific standard, since none exists for this colour.
20-second preview sample: fades in from silence over 2 seconds, plays, fades out to silence over the final 2 seconds, then stops automatically. This does not loop -- press play again to repeat. Generation: buffer-based synthesis (no AudioWorklet, safe inside sandboxed/embedded contexts). Verification: live FFT via AnalyserNode, linear regression of measured dB magnitude against log₂(frequency) across 60–4000Hz.
Coloured Noise · Black
Black Noise
Black noise has no formal DSP standard — it's most commonly described as near-total silence, punctuated occasionally by very quiet random events, rather than a continuous texture like the other noise colours. Mindspace (mindspace.music) is a sound wellbeing platform created by composer Rob Hulford; the live sample below lets you hear this one for yourself after exploring what it's associated with here.
Primarily associated with
After 15+ minutes of listening
According to the wellbeing community, black noise is reached for by listeners who find even the gentlest continuous noise colour too present, preferring near-silence with only occasional, faint disturbance. This reflects a minority preference within sound-wellbeing culture rather than a clinical finding.
No single agreed spectral standard exists for this noise colour — description reflects wellbeing-community convention, not verified science.
No single agreed spectral standard exists for this noise colour — the description reflects informal usage (often simply 'silence') rather than a scientific claim. The player below still lets you generate and inspect its real measured spectrum for yourself.
Mindspace Recommends
Use black noise where even brown or grey noise feels too present — a near-silent backdrop for the most noise-sensitive listeners.
In summary: black noise has no formal spectral standard, and is commonly associated by the wellbeing community with near-total silence for extremely noise-sensitive listening.
Coloured Noise · Frequently Asked Questions
Coloured Noise: Common Questions, Answered
What is coloured noise?
Coloured noise describes how a sound's energy is spread across the frequency spectrum. White noise spreads energy equally across every frequency; other colours weight that energy toward the bass (brown, black), the treble (blue, violet), or a specific band (green), giving each a distinct character.
What's the difference between white noise and pink noise?
White noise has a flat spectrum (0dB/octave) with equal energy at every frequency. Pink noise weights energy toward the bass, decreasing by roughly 3dB per octave, giving it a softer, less hissy character than white noise.
Is brown noise better than white noise for sleep?
Neither is objectively better — preference varies by listener. According to the wellbeing community, brown noise's deeper rumble is often described as less fatiguing over long overnight listening, while white noise's brighter hiss is often preferred for masking sharper background sounds.
What is black noise?
Black noise has no single agreed definition. It's sometimes described as near-total silence, and sometimes as an extremely low, sub-bass-weighted rumble deeper than brown noise. Both descriptions exist in wellbeing and audio culture; there's no official DSP standard either way.
What is green noise commonly used for?
Green noise concentrates energy around the ~500Hz band and is commonly described in sound-design culture as "the background noise of the world." The wellbeing community often associates it with grounding, nature-adjacent ambience.
Which coloured noise is best for focus or studying?
The wellbeing community most often reaches for pink, brown, grey, or white noise for focus and study, since their steadier, non-distracting textures tend to sit comfortably in the background. Brighter colours like blue or violet are used far less often for this purpose.
Is it safe to play coloured noise all night?
Coloured noise at a moderate, background-level volume is widely used overnight without concern. As with any sustained sound exposure, keeping the volume low reduces any risk over long listening sessions; if you have specific hearing concerns, consult an audiologist.
What volume should coloured noise be played at?
Keep it at a background level — loud enough to mask distraction, quiet enough that it doesn't demand attention. Lower volumes are generally safer for extended listening sessions, regardless of which noise colour is chosen.
Does coloured noise actually help you sleep or relax?
Many listeners report benefit, and this is a widely shared experience within sound-wellbeing culture. The strength of formal research varies by colour and by individual, so effects are best understood as commonly reported associations rather than guaranteed outcomes.
What's the difference between coloured noise and binaural beats?
Coloured noise is a single continuous texture defined by its frequency spectrum, playable through any device. Binaural beats present two slightly different tones, one to each ear, which requires headphones for the effect to occur at all.
Can white noise be used safely around babies or children?
General guidance commonly cited from the American Academy of Pediatrics suggests keeping infant sound machines at a low volume (often cited around 50dB) and placed several feet from the crib. For guidance specific to your child, speak with your pediatrician.
Why do some noise colours (like orange or yellow) sound unusual?
Colours like orange, yellow, grey, green, and black have no official DSP standard defining them. Each is built here as a stylised interpretation of how that colour is commonly described in sound-design and wellbeing culture, rather than a standardised power-law noise like white, pink, red, blue, or violet.
This page is provided for educational and general wellbeing purposes only, and is not intended as medical advice, diagnosis, or treatment. If you have concerns about hearing, sleep, or any other health condition — for yourself or a child — please consult a qualified healthcare professional.