Brown vs Pink Noise
Two dark colours, 2.91 dB per octave apart. In the bass they are almost the same sound. By the top of the spectrum they are nineteen decibels apart, and that is where the decision lives.
A Difference That Starts at Nothing and Ends at Nineteen Decibels
Brown noise was measured on this generator at −5.98 dB per octave; pink noise at −3.07, and straight to within ±0.12 dB from 50 Hz to 6 kHz, which makes it the most accurate of the five. Subtract one from the other and you get 2.91 dB per octave — a number that sounds like a technicality.
It is not a technicality, because it accumulates. Line the two spectra up at 100 Hz and the distance between them is under 3 dB at 200 Hz, about 10 dB at 1 kHz, about 15 dB at 4 kHz and about 19 dB by 10 kHz. Down in the region where both colours do their heavy lifting they are close to interchangeable. Up where speech, notifications and hiss live, pink still has something and brown has run out.
This is why the first impression of an A/B comparison is misleading. Switch between them for two seconds and they feel like the same family of sound, because the part your attention lands on first is the low body they share. Leave each running for a few minutes and the difference declares itself as a presence of detail in one and an absence of it in the other — brown as weather heard through a closed window, pink as the same weather with the window ajar.
Both are set to −20 LUFS under ITU-R BS.1770-4 K-weighting, so nothing in that comparison is a volume artefact. What changes between them is only the distribution.
Equal Energy Per Octave, Against a Ramp
The cleanest way to hold these two apart is to stop thinking in slopes and think in octave bands, which is closer to how hearing works anyway.
Pink noise is defined by having equal total power in every octave. The band from 100 to 200 Hz, the band from 1 to 2 kHz and the band from 8 to 16 kHz each carry the same share. Nothing is emphasised and nothing is withheld; that even distribution is why pink noise is the standard test signal for calibrating loudspeakers and rooms, and why listeners so consistently describe it as natural rather than as generated.
Brown noise is a ramp through the same bands. Each octave up the spectrum carries roughly a quarter of the power of the octave below it. Four octaves above your starting point there is about a two-hundred-and-fiftieth of it left. In practice brown noise has effectively finished by about 5 kHz, while pink noise is still audibly present at 10 kHz and above.
So the honest one-line description of the pair: pink noise is the neutral setting of a dark colour, and brown noise is what happens when you keep going in the same direction and do not stop.
Which Sounds Each One Can Reach
Masking requires spectral overlap — a masker suppresses what is near it in frequency and barely touches what is far away. Applied to a pair this close together, the rule produces a narrower set of differences than it does against white noise, and it is worth being precise about them rather than inventing distinctions.
Below roughly 200 Hz, brown noise wins on level. Against a lorry idling, a boiler, a lift shaft or a subwoofer through a party wall, brown noise delivers its coverage at a lower overall volume than pink can, because pink is spending part of the same budget higher up where nothing needs covering. Pink noise does work against traffic — it is 3 dB per octave darker than white, after all — but you will find yourself raising it, and everything else in the signal rises with it.
Between roughly 300 Hz and 3 kHz, pink noise reaches things brown noise cannot. The body and presence of a voice, a television two rooms away, cutlery, a keyboard, a creaking floorboard. None of these get erased by pink noise — that is white noise's job, and specifically the consonant band around 2–4 kHz — but they get blunted, and brown noise leaves them essentially untouched.
Neither is the right answer to speech. If the actual problem is that you can make out words, this comparison is the wrong one to be having. Both of these colours are on the dark side of the spectrum and both leave intelligibility largely intact; white noise is the tool that removes it, and that is a different comparison.
What Happens on Bad Hardware
Here the two colours behave completely differently, and it is probably the most consequential practical distinction on this page.
Pink noise degrades gracefully. Take away everything below 150 Hz — which is approximately what a phone speaker, a laptop or a cheap Bluetooth unit does — and what remains still sounds like pink noise, just lighter. The character survives because pink noise has meaningful content spread across every octave, so removing the bottom one or two costs it a fraction rather than the whole.
Brown noise does not degrade gracefully; it collapses. The overwhelming majority of its energy is in the region small drivers cannot produce at all, so what emerges is a thin remnant of a signal whose entire identity was the part that got lost. Turning the volume up does not recover it, because there is nothing there to amplify.
The rule of thumb this produces is slightly counter-intuitive and worth remembering: on a phone speaker, pink noise is a better brown noise than brown noise is. If you want the dark, unhurried character and the only hardware available is small, pink is the colour that actually delivers it. Reserve brown for headphones or a speaker with a real bass driver, where it becomes something pink cannot imitate.
Tolerability Over Eight Hours — Where the Usual Argument Stops Working
Brown noise's most-repeated advantage is that you can leave it running all night without the sound itself becoming an irritant, because listening fatigue from broadband noise is largely a high-frequency effect and brown noise has scarcely any high frequencies to fatigue you with.
That argument is sound, and it is aimed at white noise. Against pink noise it mostly evaporates. Pink noise has already discarded the top-octave energy that makes white noise wearing, and most people find it perfectly comfortable across a full night — it is, for that reason, the colour most likely to still be in use a month after someone first tried it.
What does separate them for some listeners is the opposite complaint. Sustained low-frequency sound produces a sensation of pressure or fullness in the ears for a minority of people, particularly on headphones, and brown noise is the colour most likely to trigger it. If a night of brown noise leaves you feeling as though your ears have been holding their breath, pink noise gives you a very similar unhurried character with a great deal less weight underneath it. That is the single most common reason people move from brown to pink and stay there.
One of Them Has Been in Trials. It Matters Less Than It Sounds.
On paper the evidence gap between these two colours is absolute: pink noise has appeared in published research and brown noise has never been the stimulus in any trial at all. In practice that gap is thinner than the sentence suggests, and the details are worth having.
The most-cited pink noise study is Papalambros and colleagues (Frontiers in Human Neuroscience, 2017), and it did not test playing pink noise while you sleep. Thirteen healthy adults aged 60 to 84 spent one night with acoustic stimulation and one with sham, while a real-time phase-locked-loop algorithm read their EEG and fired short pulses of pink noise at the predicted upstate of their own slow oscillations, in bursts of five. Overnight word recall improved relative to sham. Two details from that paper's own abstract usually get left out: slow wave activity across the whole sleep period was similar between the stimulation and sham conditions, with the increase confined to the intervals when pulses were actually being delivered — and there were thirteen participants. That is a laboratory technique in which pink noise happens to be the click. It says nothing whatever about a continuous track.
The other relevant paper is Nigg and colleagues (Journal of the American Academy of Child and Adolescent Psychiatry, 2024), which pooled trials of white and pink noise on laboratory attention tasks in young people with ADHD or elevated attention problems. It found a small benefit in that group, no benefit outside it, and — the line that matters here — no studies of brown noise were identified.
And for continuous noise as a sleep aid generally, the 2021 systematic review in Sleep Medicine Reviews assessed 38 articles and rated the quality of that evidence as very low under GRADE, noting that this contradicts how widely such noise is used.
Put together: pink noise's research record consists of a closed-loop laboratory paradigm that does not transfer and a small attention effect measured on lab tasks; brown noise's record is empty. Choosing pink because it is "the evidence-based one" is a defensible instinct that the evidence does not really support. Choose on acoustics and comfort, and treat anything on either side described as clinically proven with suspicion. None of this is medical advice.
Picking One Without Overthinking It
Start with pink unless you have a specific reason not to. It is the least likely of the five to be wrong, it survives whatever you play it on, and it is comfortable for long stretches. If you have no clearly identified intrusion and simply want something running, this is the answer.
Move to brown if the problem is genuinely low. Rumble, machinery, thumping bass, footsteps overhead. Brown noise covers those at a lower volume than pink can, and lower volume for the same result is always the better trade.
Move back to pink if brown feels heavy, muffled or physically present. That reaction is common and it does not go away with acclimatisation.
Check what you are listening on before you conclude anything. A comparison run through a laptop speaker has already been decided by the laptop.
Give each of them two nights, not two minutes. These two colours are close enough that a brief switch tells you almost nothing, and the qualities that actually differ — fatigue, weight, whether you woke at 4 am — only show up over a full night.
The Short Answer
Pink noise is the better default and brown noise is the better specialist. Pink is more versatile, more portable across hardware and comfortable indefinitely; brown is more effective against low-frequency intrusion and more enveloping, provided you have something that can reproduce it. Neither has evidence behind it worth choosing on, and the 2.91 dB per octave between them is a real difference that is invisible in the bass and obvious in the treble.
Both are generated live rather than looped here, so there is no repeat point in either. Browser sessions are capped at 30 minutes; the free Android app lifts the cap and carries both, which is the practical way to run the two-night test above without the sound stopping halfway through the answer.
Frequently Asked Questions
Is pink noise just brown noise turned down?
No — the difference is in the shape of the spectrum, not the level, and turning brown noise down does not produce pink noise at any setting. Brown falls at -5.98 dB per octave and pink at -3.07, so they diverge by about 2.91 dB every time the frequency doubles: nearly identical at 200 Hz, about 10 dB apart at 1 kHz, about 19 dB apart at 10 kHz. Both colours here are normalised to the same perceived loudness, so switching between them changes where the energy sits and not how loud the room is.
Which is better for sleeping through the night?
For most people pink noise, but for an unglamorous reason: it works on whatever you play it through and it is comfortable for hours. Brown noise is the better answer when the specific thing waking you is low-frequency — traffic, machinery, footsteps above — because it covers those at a lower volume. There is no research that ranks noise colours for sleep, and the 2021 systematic review of continuous noise as a sleep aid rated the overall evidence very low quality, so this is a matter of matching the sound to the problem rather than following a finding.
Which one masks traffic better?
Brown noise, clearly, if your speaker can reproduce it. Road noise is concentrated at low frequencies and brown noise puts nearly all of its energy there, so it achieves the same coverage at a lower setting than pink does. Pink noise is not useless against traffic — it is still darker than white — but it spends a large share of its budget above the frequencies where road noise lives, so you end up raising the level and taking a lot of unnecessary midrange with it.
Can you actually hear the difference between brown and pink noise?
Yes, though not instantly. The two share the low-frequency body that dominates a first impression, so a rapid switch between them can feel like almost no change. Give each one a minute and the difference becomes obvious as a presence or absence of detail above about 2 kHz — pink has audible air and texture at the top, brown effectively stops by around 5 kHz. Because both are normalised to the same perceived loudness here, what you are hearing is genuinely the spectrum and not a level difference.
Which sounds better on a phone speaker?
Pink noise, by a wide margin, and this is the one situation where the recommendation flips regardless of what is bothering you. Small speakers roll off steeply below roughly 200 to 300 Hz, which removes most of what brown noise consists of, so a phone plays back a thin fragment of it. Pink noise loses only its bottom octave or so and still sounds like itself. If a phone is the only device involved, pink is the more faithful way to get a dark, unhurried sound.
Is pink noise scientifically proven while brown noise is not?
That framing sounds right and does not survive contact with the papers. Pink noise has appeared in trials and brown noise has not, but the famous pink noise sleep study used 50-millisecond pulses phase-locked by live EEG to each participant's own slow oscillations in thirteen older adults, and slow wave activity across the whole night was similar between the stimulation and sham conditions. That is a laboratory technique, not continuous playback. The 2024 meta-analysis that included pink noise measured small effects on laboratory attention tasks in ADHD, and identified no brown noise studies at all. Neither result is a reason to choose a bedtime sound.
I get a feeling of pressure in my ears with brown noise. Is pink noise better for that?
It is the usual next step, yes. A minority of listeners report a sensation of fullness or pressure with sustained low-frequency sound, particularly on headphones, and brown noise concentrates more energy down there than any other colour on this site. Pink noise keeps the unhurried, weather-like character while carrying about 3 dB per octave less low-frequency emphasis, which is often enough for the sensation to stop. Playing through a speaker across the room rather than in-ear also helps. If anything about the sensation persists after you stop, that is worth raising with a clinician rather than solving with a different colour.