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Pink vs brown noise: which one is for what
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 |
| Sleep onset | Common pediatric default | Deeper, often preferred for adult insomnia |
| Focus | Balanced; works for most environments | Best for sustained focus in quiet spaces |
| Tinnitus | Most common starting point | Better for low-pitched tinnitus |
| 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 for infant sleep — pink is the most-recommended pediatric default.
- 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 — especially for ADHD focus or anxiety reduction.
- You're in a quiet environment and want noise to feel like an environment rather than a sound effect.
- Your tinnitus is low-pitched (rare).
- You find pink "too active" and want something darker.
- You're falling asleep with insomnia 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 use the warm slider to dial it back toward pink-ish.
If you find both pink and brown clinical-feeling, try one of NoiseMoon's themed soundscapes. Cathedral (reverberant pink), 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 — below 60 dB SPL for prolonged listening, ideally below 50 dB 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 presets are mathematically pure procedural noise at the textbook slopes. Switch between them with one tap. The warm ↔ bright slider 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.
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