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Pink vs brown noise: which one is for what

May 5, 2026, updated October 11, 2026

Pink and brown are the two noise colors most people gravitate toward for sleep and focus. They sound similar at first listen and they’re often used interchangeably. They’re not the same, and the difference matters depending on what you’re trying to mask.

The short answer

Pink noise rolls off at −3 dB/oct. Brown noise rolls off at −6 dB/oct. The numbers mean: for every doubling of frequency, pink loses 3 decibels of energy, brown loses 6. Brown is darker, lower, and more rumbly. Pink sounds more like rain. Both are softer than pure white noise, both are popular for sleep, and which one you want depends on your environment and personal preference.

What they sound like

  • Pink sounds like steady rainfall, a distant waterfall, or the ocean from a few hundred yards away. Balanced. Easy on the ear over long sessions.
  • Brown sounds like surf right at the shoreline, a distant freight train, or a low rumble. Heavy on the bass. Almost physical at higher volumes.

Both are mathematical sound textures: their character comes from the slope of the spectrum, not from any specific environmental sound being mimicked. The “rainfall” or “rumble” associations are how human ears parse the spectral shape, not features the noise generator put there.

Side by side

Property Pink Brown
Spectral slope −3 dB/oct −6 dB/oct
Sounds like Rainfall, distant waterfall Surf, distant rumble, freight train
Best for masking Voices, mid-frequency interruptions Low rumble, HVAC, deep environmental noise
At bedtime Softer, rain-like character Deeper, darker character
Focus Balanced; suits most environments A common pick for quiet spaces
High-frequency content Some audible high end Very little high end
How it feels Even, steady, ambient Grounding, low, almost physical

When to pick pink

Pink is the more versatile of the two. Choose it when:

  • You’re masking a wide range of frequencies (voices, dishwasher, HVAC, kids).
  • You’re using noise at family bedtime; pink’s softer character is a popular pick.
  • You’re new to noise apps and don’t know your preference yet. Pink is the safe starting point.
  • You want noise that “disappears” rather than feeling present.

When to pick brown

Brown earns its keep in specific situations. Choose it when:

  • You want a noise that feels grounding and anchoring, a common preference among focus listeners.
  • You’re in a quiet environment and want noise to feel like an environment rather than a sound effect.
  • You listen with tinnitus and prefer sound with very little high-frequency energy.
  • You find pink “too active” and want something darker.
  • You run overnight sound and want the deepest, lowest masking layer available.

When neither is right

If you’re masking a coffee shop or shared office where speech is the main interruption, white noise is more aggressive. White’s full high-frequency energy cuts through speech better than either pink or brown. The trade-off is white feels harsher; you can slide Tone toward Warm to dial it back toward pink-ish.

If you find both pink and brown clinical-feeling, try one of NoiseMoon’s worlds. Cathedral (reverberant brown), Velvet (dark filtered brown), or River (flowing pink-tinted texture) are all noise variants with more character than the mathematical defaults.

Volume guidance

Both pink and brown should be set quietly: keep them at a comfortable, low level, quieter than conversation, especially for overnight or all-day use. The bass-heavy character of brown can mask its actual loudness; you might be playing it louder than you think. A common rough check: if you can hold a normal-volume conversation over the noise without raising your voice, you’re in the right zone.

Try them yourself

NoiseMoon’s pink and brown sounds are mathematically pure procedural noise at the textbook slopes. Switch between them with one tap. The Tone slider (Warm ↔ Bright) lets you blend: sliding pink toward Warm gives you something between pink and brown, sliding brown toward Bright gives you something between brown and pink.

One session is usually enough to feel which one fits your environment. Most people end up with a preference inside a few minutes.