White, pink and brown noise differ in how their power is distributed across frequencies. White noise has equal power per hertz. Pink noise has approximately equal energy per octave, with power spectral density proportional to 1/f. Brown noise falls more steeply, at 1/f2, giving lower frequencies more weight. These are descriptions of sound, not a ranking of which will make you feel better.
This guide compares noise colors. For the broader choice between a noise track, a nature recording and a musical sound bed, see white noise vs nature sounds vs ambient sound.
White, pink and brown noise at a glance
Power spectral density describes how much signal power lies in each unit of frequency. Here, f means frequency, measured in hertz (Hz). The definitions follow MathWorks' official dsp.ColoredNoise reference. They describe ideal spectral shapes over a defined frequency range, not measurements of a particular recording or earbud.
| Color | Spectral rule | Listening shorthand, not a promise |
|---|---|---|
| White | Flat power per Hz; equal-width frequency bands carry equal power. | A relatively bright, hiss-like texture. |
| Pink | Approximately 1/f; equal power per octave, or equal energy over the same duration. | Less high-frequency emphasis than white; a fuller noise texture. |
| Brown | Approximately 1/f2; a steeper decrease toward higher frequencies. | More low-frequency emphasis; a deeper, rumble-like texture. |
The texture descriptions are listening analogies, not standardized ratings. A rain recording is not automatically pink noise, and a low rumble is not enough to certify a track as brown noise. The color describes a distribution, not the sound's subject.
Why "per hertz" and "per octave" are different
An octave spans a doubling of frequency. For example, 100 to 200 Hz is one octave; 200 to 400 Hz is the next. The second band is twice as wide in hertz. White noise therefore puts twice as much power in that second band, even though its power per hertz stays flat.
For pink noise, the falling 1/f density balances the widening octave bands. Each octave has the same power in the ideal model. MathWorks also demonstrates approximately equal octave-band power for a generated pink-noise signal. Brown noise falls faster: in the ideal 1/f2 model, the next higher octave carries half as much power.
Those ratios are mathematical examples within each noise signal. They do not compare the playback volume of three separately mastered tracks. "Brown" tells you the spectral slope, not how loud the file will play.
What a noise-color label does not tell you
A label alone does not specify the recording level, the frequency limits or how playback changes the signal. Real recordings and devices cannot reproduce an unlimited frequency range. Added music, filtering or other processing can also make a labeled track differ from the simple model.
Separate two questions: Do I prefer this balance of high and low frequencies? And do I like this particular recording? If one brown-noise track feels too heavy, that is a useful observation about this playback, not proof that all brown noise is unsuitable. We have not measured the spectra of commercial tracks or tested noise colors through SoClip Pebble.
Choose by texture, not a promised outcome
- If a bright hiss bothers you: try pink noise at a low level and notice whether its reduced high-frequency emphasis suits you.
- If you want a more bass-weighted texture: try brown noise, but do not raise the volume just to make the low end feel stronger.
- If a deeper sound feels intrusive: try a lighter texture or silence. A lower-frequency balance is not automatically more comfortable.
Use the same device and room for a brief comparison. Start each track low and adjust downward if needed; matching a volume-slider position does not establish equal sound output. Include a quiet gap. This is a personal preference check, not a calibrated test or evidence of improved concentration, sleep or health.
A darker sound is not a safety rating
Do not infer safety from a soft or bass-heavy texture. WHO's safe-listening guidance emphasizes sound level, exposure duration and repeated exposure. Keep playback low, take quiet breaks and avoid turning audio up to compete with a noisy setting.
NIDCD's hearing-loss guidance recommends reducing hazardous noise, moving away or using appropriate hearing protection. An open-ear earbud is not hearing protection. Stop if playback causes discomfort or interferes with warnings; seek qualified advice for persistent ringing or hearing difficulty.
Choose the listening hardware separately
SoClip Pebble is a clip-on, open-ear listening option. It is not hearing protection, and this comparison does not establish a special advantage for any noise color. The SoLabs App is a supporting content layer; this guide does not claim that it provides pink- or brown-noise controls.
If that wearing style fits your needs, explore SoClip Pebble. For the equipment decision, our headphones for white noise guide covers fit, environment and playback considerations.
Editorial scope
Prepared October 2, 2026 by S&O Labs Editorial Team. This is a brand-authored explanation of acoustic definitions, not a firsthand product test or a clinical review. It does not recommend noise as a treatment for insomnia or ADHD. No noise color is named a universal winner. Our Editorial Policy explains our publishing responsibility and commercial relationship.
Explore the Sound & Calm guides and our Method and Sources for how we separate general research from product claims.
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