Focus noise, honestly
Brown vs pink vs white noise: what the research actually says
Steady noise can genuinely help you concentrate — but not for the reasons most of the internet claims, and not equally for everyone. Here's a plain-English, cited look at what the evidence supports, and where it's thin.
The three colours of noise
“Colour” describes how a noise's energy is spread across the frequency spectrum — the same way light gets its colour. All three below are broadband noise (every audible frequency at once); they differ only in the balance between high and low.
Energy falls off steeply toward higher pitches, so the low end dominates. It's the darkest, softest-sounding of the three and the least fatiguing over long sessions — which is why it's become the default “focus” sound.
Equal power in each octave. To our ears — which hear in octaves — this is the most natural, even-sounding noise. It sits between white and brown, and is the colour used in most sleep research.
Equal energy at every frequency, so the treble stands out. It's the most aggressive masker of high-pitched distractions like keyboards and chatter, but the most tiring to listen to for hours.
Does noise actually help you focus?
Here's the honest headline: the evidence for noise as a direct cognitive booster is modest and depends heavily on who you are. The evidence for noise as a masker of worse sounds is much stronger.
The masking effect — the part that's hard to argue with
The most disruptive sound in a typical work environment isn't volume — it's intelligible speech. Overhearing a conversation you can understand hijacks the same verbal machinery you're trying to use to think, an effect robust enough that surveys of open-plan offices rank background speech as the number-one concentration killer.6 A steady, non-verbal noise covers that speech with something your brain can safely ignore. This is the mechanism with the least hand-waving behind it: you're not enhancing your brain, you're removing a distraction.
Noise, ADHD, and “stochastic resonance”
The most-cited idea for noise as a genuine enhancer is stochastic resonance: the counterintuitive finding that adding a bit of noise to an under-aroused system can improve how it detects signals. In a landmark 2007 study, white noise improved cognitive-task performance in children with ADHD while worsening it in children without — the “moderate brain arousal” model attributes this to differences in dopamine.1
A 2024 systematic review and meta-analysis (13 studies, 335 participants) put numbers on it. White and pink noise produced a small positive effect for youth with ADHD or elevated attention problems (Hedges' g = 0.25) and a small negative effect for those without (g = −0.21).2 In other words: helpful if your attention system runs under-aroused, mildly counterproductive if it doesn't. That's a real, replicated finding — and a useful antidote to the “brown noise fixes everyone's focus” framing.
Read more: does brown noise actually help with ADHD? → — a deeper, cited look at the studies, the dopamine theory, and why the viral favourite isn't the one the research tested.
What about pink noise and sleep?
You'll see pink noise described as memory-boosting. That claim traces to real studies — but read the fine print. In them, researchers played short pink-noise pulses timed precisely to the slow brain waves of sleeping adults, which deepened those waves and improved next-morning memory recall.3 That's phase-locked, EEG-triggered stimulation in a lab — not the same as streaming pink noise all night, which is what a noise app does.
For continuous noise as an everyday sleep aid, a 2021 systematic review of 38 studies rated the overall evidence very low quality, and found continuous noise could even fragment sleep in some cases.4 The realistic benefit is again masking: a constant backdrop smooths over the sudden sounds — a door, a car — that would otherwise jolt you awake.
Read more: does white noise actually help you sleep? → — a deeper, cited look at the sleep evidence, using noise safely for babies, and whether pink or brown is better at night.
Why we don't do binaural beats
Binaural beats — two slightly different tones, one per ear, meant to “entrain” brain rhythms — are frequently marketed alongside focus noise, but they're a different thing entirely, and the evidence is genuinely mixed. One meta-analysis reported a medium average effect on cognition and anxiety (g = 0.45),5 yet results across studies are inconsistent and the field is dogged by small samples and weak blinding. We'd rather ship the thing with the sturdier mechanism — broadband noise and masking — than build features on a shaky claim.
So which noise should you pick?
There's no research showing one colour beats another for concentration, so the deciding factor is comfort — the best noise is the one you stop noticing:
for long, deep-work sessions where a soft, low rumble fades into the background and won't tire your ears.
when you need to bury sharp, high-pitched distractions — nearby typing, phone chatter, a noisy café.
as the middle ground, or for winding down — balanced and rain-like, easy to leave on for hours.
Keep the volume just high enough to cover what's distracting you and no higher. The goal is a steady, forgettable backdrop — not a wall of sound.
Frequently asked questions
What is the difference between white, pink, and brown noise?
All three are broadband noise — every audible frequency at once — but balanced differently. White spreads energy evenly and sounds bright and hissy. Pink reduces energy as pitch rises (equal power per octave) and sounds fuller, like steady rain. Brown falls off faster still, sounding deep and rumbly, like a distant waterfall.
Does brown noise actually help you focus?
Its most reliable benefit is masking: a constant non-verbal sound covers intermittent speech, the most disruptive office sound. Beyond that, a 2024 meta-analysis found white and pink noise gave a small boost to people with ADHD but slightly worsened performance in people without. So it's not a universal enhancer — but it can make a noisy space quieter and more consistent.
Is brown noise better than white noise for concentration?
No study shows one colour is objectively better. The real difference is comfort: brown is darker and less fatiguing for long sessions, while white masks high-pitched distractions more aggressively. Pick whichever you can forget is playing.
Does pink noise improve sleep and memory?
The memory findings come from lab studies that play short pink-noise pulses timed to a sleeper's brain waves — not from streaming noise all night. A 2021 review rated the evidence for continuous noise improving sleep as very low quality. It may still help by masking sounds that would otherwise wake you.
Is it safe to listen to focus noise all day?
Keep it quiet — just loud enough to cover distractions. Prolonged loud audio through headphones carries the usual hearing-safety trade-offs, and a barely-there level is both safer and more effective, since you want a backdrop, not a blast.
References
- Söderlund G, Sikström S, Smart A. Listen to the noise: noise is beneficial for cognitive performance in ADHD. Journal of Child Psychology and Psychiatry. 2007;48(8):840–847. doi:10.1111/j.1469-7610.2007.01749.x
- Nigg JT, Bruton A, Kozlowski MB, Johnstone JM, Karalunas SL. Systematic Review and Meta-Analysis: Do White Noise or Pink Noise Help With Task Performance in Youth With ADHD or With Elevated Attention Problems? Journal of the American Academy of Child & Adolescent Psychiatry. 2024;63(8):778–788. doi:10.1016/j.jaac.2023.12.014
- Papalambros NA, Santostasi G, Malkani RG, et al. Acoustic Enhancement of Sleep Slow Oscillations and Concomitant Memory Improvement in Older Adults. Frontiers in Human Neuroscience. 2017;11:109. doi:10.3389/fnhum.2017.00109
- Riedy SM, Smith MG, Rocha S, Basner M. Noise as a sleep aid: A systematic review. Sleep Medicine Reviews. 2021;55:101385. doi:10.1016/j.smrv.2020.101385
- Garcia-Argibay M, Santed MA, Reales JM. Efficacy of binaural auditory beats in cognition, anxiety, and pain perception: a meta-analysis. Psychological Research. 2019;83(2):357–372. doi:10.1007/s00426-018-1066-8
- Banbury SP, Berry DC. Office noise and employee concentration: identifying causes of disruption and potential improvements. Ergonomics. 2005;48(1):25–37. doi:10.1080/00140130412331311390
This page summarises published research for general information. It isn't medical advice, and noise is not a treatment for ADHD or any sleep disorder — talk to a clinician about those.