Brown Noise for Focus
Short answer
Brown noise can help you focus by covering low, rumbling sounds like traffic, air conditioning or footsteps. It is a poor choice for voices: for speech, white or green noise works better. There is no evidence that it boosts your brain directly. In quiet rooms, studies found noise made people without ADHD do slightly worse.
Start by Asking the Right Question
People who look for a focus sound usually hope for one of two things. The first is that a sound will make their brain work better than it does in silence. The second is that a sound will stop the room from pulling their attention away.
The evidence for the first is weak, and for most people it points the other way. The evidence for the second is solid, measured, and backed by years of research on offices and rooms. Almost everything useful on this page comes from focusing on the second question.
So the honest view is this: silence is the starting point. Background noise is a way to win back part of what a noisy room costs you. If you work in a really quiet room, adding noise is unlikely to help, and it might cost you a little. If you work near people talking, it can win back a real amount.
The Number That Predicts How Much Speech Distracts You
Experts who design rooms have measured this for years, because open-plan offices made it an expensive problem. They use the Speech Transmission Index (STI). It is a score from 0 to 1 for how easy it is to follow speech where you sit. Close to 1 means every word is clear. Below about 0.2, you can hear that people are talking, but you can no longer follow the words.
The key source is Haapakangas, Hongisto and Liebl, The relation between the intelligibility of irrelevant speech and cognitive performance (Indoor Air, 2020). It is a careful review of lab experiments. In them, researchers used steady background noise to make nearby speech easier or harder to follow. It pulled together 14 studies with 34 tests and updated an earlier model from 2005.
The shape of the result is the useful part. Across all tests, performance starts to drop above about 0.21 on the scale and is at its worst by about 0.44. Above that point it does not get much worse, because the damage is already done. Tasks where you hold words in short-term memory showed the strongest and most consistent effect, with performance dropping across the range from 0.12 to 0.51.
Two lessons follow. How clearly you can follow speech matters more than how loud it is. A loud conversation where you cannot make out the words costs you far less than a quieter one you can follow. And there is a target, not a "louder is better" rule. You are not trying to make the room as loud as possible. You are trying to blur speech just past the point where it stops hurting, and then stop. That is why a modest amount of the right noise can do the whole job.
The review is also careful about what it does not show. It found some evidence for tasks where you hold and work with words in your head, and only limited evidence for complex word tasks. So the strong claim applies to keeping words in mind, the kind of thing that breaks when a colleague says your name. It does not apply equally to everything you might call "concentrating".
Why Brown Noise Is the Wrong Colour for Voices
To blur speech, a covering sound needs energy where the clear parts of speech are. Consonants carry most of the meaning in a sentence, and they are mostly higher, hissier sounds. That is exactly the range where brown noise has almost nothing.
Brown noise gets steadily quieter as the pitch goes up. We measured the brown noise on this site, and it follows that pattern exactly, as true brown noise should. By the range where consonants sit, very little of it is left. If you set it loud enough to cover the murmur under a conversation, the consonants still stand clear on top. So you can still follow the words, and the cost to your memory stays the same. You will have made the room louder without making it less distracting.
For speech, the colours with more high sound are the ones that work. White noise is even across all pitches, and it is by far the best of the five at covering speech. Green noise puts its energy in the middle range, where the voice itself sits. That makes it the most efficient choice for its volume, and it still works on a laptop speaker.
So what is brown noise good for in a working day? Everything below speech: traffic, air conditioning or a heating system, a lift motor, a neighbour's bass, footsteps and door slams above you, roadworks, the low roar of a café. Those are deep, rumbling sounds, and brown noise covers them at a lower volume than any other colour here. It also fades into the background more fully than any other colour, which is worth something in a sound you plan to run for hours.
A simple rule: brown noise for rumble, white or green for voices. If your open-plan office has both, that is a good reason to try pink as a middle ground, or to play two sounds together. It is also why a page that only sold you brown noise would let you down.
There Is No Evidence of a Brain Boost, and Some Against It
Be sceptical of the claim that noise does something to your brain to make it work better. On current evidence, that seems true for one group of people. For everyone else it seems untrue, or a little harmful.
A 2024 review of many studies in the Journal of the American Academy of Child and Adolescent Psychiatry pooled randomised trials of white and pink noise on lab attention tasks. In comparison groups without ADHD (eleven studies, 335 people), the overall effect was negative. The noise made performance slightly worse, not better, and the authors say this possible harm needs more study. In people with ADHD or high ADHD symptoms, there was a small positive effect, covered on the ADHD page.
Read that carefully, because it is easy to go too far the other way. Those experiments took place in quiet labs, where the noise had nothing to cover. So they show the direct effect of noise on thinking, without the covering benefit. In people without ADHD, that direct effect does not help.
That is the whole point of this page in one line: in a quiet room, background noise costs you a little; in a noisy one, it removes a bigger cost. If you already work somewhere silent and hope noise will sharpen you up, the evidence says do not bother. If you are trying to make a noisy place bearable, you are on solid ground.
This page makes no claims about brainwaves or special sounds that unlock focus. No sound on this site does any of that, and no page on this site will claim it does.
A Setup That Works for a Full Working Day
Match the colour to the noise, not to your mood. Spend thirty seconds working out what is actually breaking your concentration. Voices, or rumble? That one question decides the colour, and the right colour needs far less volume.
Aim to blur, not to erase. The target is the point where you can hear that people are talking, but you can no longer follow what they say. Past that point, more volume only adds to what your ears take in, with no extra benefit.
Set it before you start, and do not touch it again. A volume slider you keep going back to has become one more thing fighting for your attention. Choose the level in the first minute, then leave it alone for the session.
Use a speaker instead of headphones when you can. At the same felt loudness, headphones put more sound into your ears, and it is harder to keep them low over an eight-hour day. When headphones are the only option (a shared desk, a café), keep the level low enough that you could still hold a conversation over it. No safe level for long daily use has been established, so keep it low.
Use it to mark the start of work, not to fill the day. Many people find the biggest benefit is the start signal: noise on means work has begun. That costs nothing, and it does not need the sound to run for six hours.
Studying, Reading and Writing Are Not the Same Task
"Focus" covers activities that react very differently to sound. The review above gives a reason: the effect of clear speech was strongest and most consistent for short-term memory of words, while the evidence for complex word tasks was limited.
Memorising, note-taking, mental arithmetic, proofreading. These rely most on keeping words in mind. Nearby speech you can follow damages them most reliably. This is where covering noise helps most.
Reading to understand, and writing. These feel like they should suffer most. But the evidence for complex word tasks is thinner, not stronger. So be wary of any confident claim here, including a confident claim that noise will help. Try it and judge for yourself.
Repetitive or routine work. Data entry, admin, tidying files, small routine code changes. These are the least affected by background sound of any kind. If noise helps you here, it probably helps your motivation, not your thinking. That is a fine reason to use it. It is just not the reason the studies describe.
One warning for all of them: music with lyrics does not cover speech. It is speech you chose to add, and speech is what does the damage. If you want the room quieter in the way that matters, a steady sound with no words is a completely different tool from a playlist.
The Web Player, and What the App Adds for Work
The player above makes brown noise live in your browser. There is nothing to download and nothing recorded, so there is no loop that starts to stand out in the middle of the afternoon. Free web sessions run for 30 minutes. That is about one focused work block, and enough to find out if this suits you.
For work, the problem is different from sleep. You want the sound to last a whole day, through tab switches, a closed laptop lid and a walk to a meeting. The free app removes the 30-minute limit, keeps playing in the background with the screen off, needs no internet once installed, and has all five colours. That matters here, because the honest advice on this page is that the right colour depends on whether your problem is voices or rumble. You should be able to switch between them in a second.
Frequently Asked Questions
Does brown noise actually improve concentration, or does it just cover other sounds?
On current evidence, mostly the second, and that is the useful part. Lab studies show that people do worse as nearby speech gets easier to follow. The drop starts above about 0.21 on the Speech Transmission Index (a 0 to 1 score for how clearly you can follow speech) and is at its worst around 0.44. So anything that blurs speech below that range wins back real performance. What steady noise does not seem to do is improve thinking directly. In the 2024 review of many studies, people without ADHD did slightly worse with white or pink noise in quiet labs. Cover the room, but do not expect a boost.
Which noise colour is best for an open-plan office?
If the problem is colleagues talking, white noise covers speech best of the five. The clear parts of speech are mostly high sounds, and white noise is even across all of them. Green noise comes second and is efficient. It puts its energy in the middle range where the voice sits, so it works at a lower volume and still works on a laptop speaker. Brown noise is the wrong tool for voices but the right one for the building itself: air conditioning, lifts, traffic and footsteps from the floor above. Many open-plan offices have both problems at once. In that case, pink is a sensible middle ground.
Is brown noise better than music for studying?
For anything where you keep words in mind, music with lyrics is the worst of the three. Words are exactly what disrupts short-term memory for words, and a lyric is clear speech you invited in. Music without words sits in between, but it has its own problem: it changes, and change pulls your attention. Steady noise has no words and no changes, which is its advantage. Whether you enjoy it as much is a separate question. Enjoyment really does affect whether you sit down and work.
Should I use headphones or a speaker for focus sessions?
A speaker, whenever you can. At the same felt loudness, headphones put more sound into your ears, and over a working day the hours add up. A speaker across the room also gets quieter with distance for free, and it makes the sound feel like part of the room, not something attached to your head. There is one more reason with brown noise. Small speakers cannot play the deep sounds where most of its energy sits. If a laptop speaker is all you have, green noise gives you far more covering for the same volume.
How many hours a day is it reasonable to run background noise while working?
No study sets a limit. The 2024 review says that finding safe and suitable volume levels is work still to do. That gap matters more for focus than for sleep, because work can mean six to eight hours a day, five days a week, for years. Two practical points. Keep the level low enough that a colleague could talk to you without either of you raising your voice. And switch noise on when the room is really distracting, not by default whenever the computer is on.
Will brown noise help with reading comprehension?
Possibly, but here the honest answer is that the research is thin. The 2020 review of speech and performance found the link strongest and most consistent for short-term memory of words. It found some evidence for tasks where you hold and work with words, and only limited evidence for complex word tasks. Reading to understand belongs in that last group. Anyone who tells you confidently that background noise improves or ruins your reading is going beyond the evidence. Test it on your own reading, over several days, not one.
I work somewhere completely quiet. Should I still use noise to focus?
Probably not. This is the one case where the evidence points slightly against it. In quiet labs, with nothing for the noise to cover, people without ADHD did slightly worse with white or pink noise than without it, across eleven studies. With nothing to cover, you get only the direct effect, and that effect does not help you. There is one exception that people report but studies do not measure: habit. If switching on noise is what reliably starts your work session, that is a real benefit. It does not need the sound to be loud or to run for long.