Focus & ADHD
Brown, Pink or Green Noise for ADHD Focus: What the Research Says
Brown noise went viral in ADHD communities. Here is what the studies actually show, and a simple way to find the noise that works for you.
Noise colors
White vs Pink vs Brown Noise: Which Is Best for Sleep, Study or Focus?
The three noises people argue about most, compared side by side, plus the less common colors and a simple way to choose.
On this page
“Noise” sounds like one thing, but there is a whole spectrum of it, and each type has a color. The color tells you where the energy sits: low and rumbly, high and hissy, or somewhere in between.
White noise
White noise has equal energy at every frequency. Because human ears are more sensitive to high frequencies, it sounds bright and hissy, like a detuned radio, a strong fan or an air conditioner.
Good for: covering voices and sudden sounds in busy places like open-plan offices.
Pink noise
Pink noise loses energy as the pitch rises: each octave up has half the power of the one below. The result sounds balanced and softer than white noise, like steady rain or wind through leaves.
Good for: studying, reading and sleep, when white noise feels too sharp.
Brown noise
Brown noise (sometimes called red noise) drops off even faster, so most of its energy is in the low end. It sounds like a deep rumble, distant surf or a waterfall. The name comes from Brownian motion, not the color.
Good for: long deep-work sessions and falling asleep. It has become a favorite in ADHD communities, although it hasn’t been studied in controlled trials. More in brown, pink or green noise for ADHD.
Green noise
Green noise concentrates on the middle frequencies, roughly where many nature sounds sit. It isn’t a strict scientific term, but it is widely used for a soft, natural-sounding noise, a little like a forest or a calm waterfall.
Good for: gentle focus and calm evenings.
Grey noise
Grey noise is shaped so that every frequency sounds equally loud to people. It follows a hearing curve, so it feels more even than white noise, without a harsh top end.
Good for: steady concentration if you have sensitive ears.
Blue and violet noise
Blue noise is the opposite of pink: its energy rises with the frequency. Violet noise rises even faster. Both sound crisp and airy, like a fine spray of water.
Good for: short, energetic work sessions, or cutting through a low background hum.
Quick comparison
| Noise | Sounds like | Try it for |
|---|---|---|
| White | Radio static, a fan | Masking chatter |
| Pink | Steady rain | Studying, sleep |
| Brown | Deep rumble, distant surf | Deep work, sleep |
| Green | Forest, soft waterfall | Gentle focus |
| Grey | Even, balanced hiss | Sensitive ears |
| Blue / Violet | Bright, airy spray | Short energetic sprints |
How to choose
Start with what you need to block out. Voices and clatter call for white or grey; low traffic hum is better covered by brown. Then go by comfort: the right noise is the one you forget is on. Try each for a full Pomodoro block and keep the volume low enough to talk over.
Noise colors in Solbox
Solbox has all seven colors plus eight textures designed for long sessions, such as Amber Drift, Velvet Noise and Earth Hum. Each one loops without a gap, has its own volume and can be layered with rain, ocean or café sounds. See them all on the noise colors page.
Frequently asked questions
Why are noises named after colors?
The names borrow from light. White light contains all visible colors equally, so noise with all frequencies equally is called white. Pink and brown noise are "redder", with more low frequencies, while blue and violet are tilted toward the high end.
What does brown noise sound like?
A deep, even rumble, like distant surf, a strong waterfall heard from a distance, or the inside of an airplane cabin.
Is grey noise the same as white noise?
No. Grey noise is adjusted so that every frequency sounds equally loud to human hearing, which makes it feel more balanced and less sharp than white noise.
Is pink noise better than white noise for studying?
Many people find pink noise easier to listen to for long study sessions because it is softer in the high frequencies. White noise masks voices a little better. Try each for one study block and compare.