TL;DR. Each noise "color" is just a different frequency profile — and once you start ranking them, you can fall down a rabbit hole. The honest answer: pick the one your ears like and stick with it. I prefer something deep and meditative, but not so heavy it can't mask café chatter. That's brown noise for me. Yours might be different.
Here's how the four most common noise colors actually differ — and what each one is best for.
White noise
White noise is the most-searched of the bunch, and for good reason — it's the original sleep aid. Equal energy across every audible frequency. It sounds like a TV tuned to a dead channel or a steady wash of static.
What it's good for: blocking sudden, sharp sounds at night. A baby crying down the hall. A roommate slamming a door. Because white noise has so much high-frequency content, it masks high-frequency interruptions extremely well.
The downside for studying or working: those same high frequencies can feel fatiguing after an hour or two. Some people describe it as "thin" or "harsh." It works, but you might find yourself reaching to turn it down.
Brown noise
Brown noise — sometimes called "red noise" — rolls off heavily as frequency goes up. The technical version: its power drops about 6 decibels per octave (a 1/f² curve). The plain version: it's bass-heavy. It sounds like a distant waterfall, a steady ocean roar, or low wind moving through a tunnel.
Brown noise is where most deep-work and study communities have landed. The low end masks the kind of low-mid distractions that fill real life: HVAC hum, conversations a few tables away, the rumble of a subway. It's also less ear-fatiguing over long stretches — there's nothing piercing in the spectrum to wear you down.
This is the one I use, and it's why Deep Timer plays brown noise by default. It's deep enough to feel like a wall around me, soft enough that I can wear it for two hours and barely notice.
Pink noise
Pink noise sits in the middle. Its power drops about 3 dB per octave (a 1/f curve), so it's softer than white but brighter than brown. It sounds like steady rain on a roof or wind in trees.
A lot of sleep research uses pink noise specifically, and some studies have linked it to better deep-sleep quality. For studying, it tends to land well for people who find white noise too sharp but brown noise too sluggish. A solid balanced pick.
If you've never tried it, run a few sessions on pink before defaulting to brown — you might prefer the lighter texture.
Green noise
Green noise is the least standardized of the four. Most definitions describe it as a slice of pink noise centered around the middle of the audible range — roughly the frequencies of natural ambient sound (waterfalls, gentle wind, distant ocean). Some apps mean slightly different things by it.
It tends to feel the most "natural" of any color — less synthetic, more environmental. If white noise feels like a machine and brown noise feels like a tunnel, green noise feels like a forest. If that association helps you focus, it might be your color. If you can't tell it apart from pink, don't sweat it.
Other things that actually matter
Color isn't the only variable — and in my experience, it's usually not the most important one. A few that matter more:
- Volume. Too quiet, ambient distractions cut through. Too loud, the noise itself becomes the distraction. Aim for "just barely louder than the room."
- Environment. I use brown noise at a café because it competes well with chatter. At home in a quiet room, pink or green often feels better.
- Headphones vs. speakers. Over-ear headphones change perceived bass. Brown noise on cheap earbuds can sound thin. Test before judging.
- Looping artifacts. Many noise apps loop short clips, and once you hear the loop point, you can't un-hear it. Look for noise that's either generated continuously or has a long, well-blended crossfade.
- Brain habituation. Whatever you pick, your brain will tune it out within a few minutes. That's not a bug — that's the whole point. Resist the urge to keep switching colors hoping to feel something.
Wrap-up
Don't overthink the color. There's no peer-reviewed gold medal here — just slightly different spectra that work slightly differently for different ears and different rooms.
If you're starting fresh, try this:
- Brown for deep work, café focus, and long writing sessions.
- Pink for lighter work, reading, or studying at home in a quiet room.
- White for blocking sudden noises — the bedroom is its natural home.
- Green if you want something closer to nature than to a machine.
Pick one, run it for a week, and pay attention to how you feel — not how the spectrogram looks. The best noise color is the one you stop noticing.