Brown noise, free in your browser

Deep, low, and steady — brown noise puts more energy in the low frequencies than white or pink, which is why most people find it warmer and less hissy. Play it here free, layer it with rain or a fan, and set a timer. Nothing to download.

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Try it right here

Brown noise is loaded below. Tap play, then add a layer or two and hear what it does.

Brown vs. pink vs. white noise

All three are steady, broadband sounds. The difference is how the energy is spread across frequencies.

White noise carries equal energy at every frequency. It sounds bright and hissy — like an untuned radio or TV static. Effective at masking, but many people find it sharp over a full night.

Pink noise reduces energy as frequency rises. It sounds more balanced and natural — closer to steady rainfall or wind through trees.

Brown noise drops off more steeply still, putting most of its energy in the low end. It sounds deep and rumbling — like distant thunder, a far-off waterfall, or the inside of an airplane. It's the warmest of the three and the one most people reach for when white noise feels too harsh.

There's no universally correct answer. Try each for a few minutes; your preference will be obvious.

Brown noise sounds better layered

Brown noise on its own is effective but featureless. Adding a second layer gives it texture without losing the masking. Combinations worth trying, all available here:

• Brown noise + rain — the most popular pairing. Rain adds movement over the low rumble.
• Brown noise + box fan — adds a mid-range hum, close to a real bedroom fan but deeper.
• Brown noise + campfire — occasional crackle over a steady low bed. Good if pure noise feels too sterile.
• Brown noise + ocean waves — slow swell over constant low end.

Each sound has its own volume slider, so you can set brown noise as the foundation and bring the second layer up until it sits right.

Everything else in sndflo

• Layerable sounds — noise colors, nature, and textures — each seamlessly looping
• Binaural beats — delta through beta
• Bass and treble adjustment
• Sleep timers with fade-out, or leave it running all night
• Bedtime stories that hand off to your mix — the narration fades out and your brown noise keeps playing all night. Most sleep apps don't do this.
• Save and name your mixes

What it costs

Add it to your home screen

On iPhone, add sndflo to your home screen before using it overnight. Safari stops audio when your screen locks; adding it to your home screen fixes that. Tap Share, then Add to Home Screen.

FAQ

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