White Noise vs Pink Noise vs Brown Noise: What's the Difference?

You have probably heard people recommend noise for sleep, concentration, or calming a fussy baby. But there is not just one type of noise. White noise, pink noise, and brown noise each have distinct frequency characteristics that make them suited for different purposes. Understanding the differences can help you pick the right one for your situation — whether that is falling asleep faster, masking distracting sounds, or managing tinnitus.

What Makes Noise "Colored"?

Sound is made up of vibrations at different frequencies, measured in Hertz (Hz). Low frequencies produce deep bass rumbles, while high frequencies create sharp, hissing sounds. When we talk about noise colors, we are describing how energy is distributed across the frequency spectrum. The name of each noise color comes from an analogy to light, where the combination of different light wavelengths produces different colors.

Every noise color contains all audible frequencies simultaneously. What changes between them is the relative power at each frequency. This is what gives each noise type its distinctive character and makes them feel so different to listen to.

White Noise: Equal Energy at Every Frequency

White noise contains equal power across all frequencies in the audible spectrum, from 20 Hz to 20,000 Hz. Every frequency band gets the same amount of energy. Because higher frequencies carry more perceptual weight to human ears, white noise sounds bright and hissy — like static from an old television or a radio tuned between stations.

What it sounds like: A constant, even hiss. Think of the sound of air rushing from a compressed air nozzle or heavy rainfall on pavement.

Best for:

• Masking sudden sounds. White noise is the most effective noise type for covering abrupt noises like doors slamming, car horns, or people talking. The broad-spectrum energy makes it difficult for your brain to pick out individual sounds.
• Newborns and infants. White noise is widely used in nurseries because it resembles the constant whooshing sound babies hear in the womb. Research supports its effectiveness in helping newborns settle and fall asleep faster.
• Open offices and noisy environments. If you need to block unpredictable background noise while working, white noise provides the most consistent coverage across all frequency ranges.

Pink Noise: Balanced for Human Hearing

Pink noise reduces power as frequency increases, at a rate of 3 decibels per octave. This means the bass frequencies are louder and the high frequencies are softer. The result is a noise that sounds more balanced and natural to human ears, because our hearing is more sensitive to higher frequencies. Where white noise sounds sharp and hissy, pink noise sounds fuller and warmer.

What it sounds like: Steady rainfall, wind through trees, or a waterfall heard from a distance. It has the depth of low frequencies without the harsh sibilance of white noise.

Best for:

• Sleep. Multiple studies have found that pink noise played during sleep can increase time spent in deep sleep stages. The balanced spectrum is less likely to cause arousal than the brighter profile of white noise.
• Relaxation and meditation. The warm, natural quality of pink noise makes it a popular choice for relaxation soundscapes. It feels organic rather than synthetic.
• Audio testing. Engineers and audiophiles use pink noise to calibrate speakers and room acoustics because it represents equal energy per octave, matching how humans perceive loudness.

Brown Noise: Deep and Rumbling

Brown noise — also called Brownian noise or red noise — drops off even more steeply than pink noise, at 6 decibels per octave. The energy is heavily concentrated in the low frequencies, producing a deep, rolling rumble with very little high-frequency content. The name comes from Robert Brown and Brownian motion, not the color.

What it sounds like: Thunder in the distance, strong wind, a jet engine at cruising altitude, or ocean waves crashing on a shore. It is the deepest and most bass-heavy of the three.

Best for:

• Deep focus and concentration. Brown noise has become popular in ADHD and productivity communities because the low-frequency rumble can help sustain focus without the distracting high-frequency content of white noise.
• Tinnitus masking. For people with high-pitched tinnitus, brown noise can provide relief by filling the low and mid frequency ranges without adding competing high-frequency energy that might worsen the perceived ringing. See our guide on sound frequencies for tinnitus relief for more detail.
• Sleep in quiet environments. If you find white noise too harsh and pink noise too airy, brown noise provides a heavy blanket of low-frequency sound that many people find deeply soothing.

Quick Comparison

• White noise: Equal energy at all frequencies. Sounds hissy. Best for masking sharp, sudden sounds and for infants.
• Pink noise: Energy decreases at higher frequencies (-3 dB/octave). Sounds balanced and warm. Best for sleep and relaxation.
• Brown noise: Energy drops steeply at higher frequencies (-6 dB/octave). Sounds deep and rumbling. Best for focus, concentration, and tinnitus.

How to Generate Noise on Your iPhone

You do not need a dedicated noise machine. A tone generator app on your iPhone can produce white, pink, and brown noise at any volume. This gives you the flexibility to experiment with each type and find what works best for your particular use case. You can also blend noise types or adjust the frequency balance to create a custom sound profile.

Generate white, pink, and brown noise — plus precise frequency tones for speaker cleaning — all in one app.

Which Noise Color Should You Try First?

If you are new to using noise for sleep or focus, start with pink noise. It is the most universally comfortable because its frequency balance matches how human hearing works. If pink noise feels too thin, move to brown noise for more bass depth. If you need maximum sound masking — blocking out a snoring partner or street traffic — white noise provides the broadest coverage.

Everyone's preferences are different, and the best noise color is the one that works for you. Try each for a few nights before deciding. You may also find that your preference changes depending on the situation: brown noise for daytime focus, pink noise for nighttime sleep, white noise for the noisy coffee shop. Keep your listening volume at safe levels regardless of which noise type you choose, especially when using earbuds for extended periods.