Brown noise for sleep

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. In sndflo you can layer it with rain or a fan, balance each one, and set a sleep timer. Brown noise is free, and there is no account.

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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 free in the app:

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

Brown noise, the full mixer, binaural beats, sleep timers and five bedtime stories are free — no account, no trial.

The rest of the library is a one-time $19.99 unlock — not a subscription. (Most sleep apps run roughly $50–70 a year.)

FAQ

Is brown noise better than white noise for sleep?

Neither is universally better — it's preference. Brown noise is deeper and less hissy, which many people find easier over a full night. White noise is brighter and masks higher-pitched sounds more effectively. Both are free in sndflo, so try each.

Can I play brown noise all night?

Yes. Leave the timer off and it plays until you stop it. Playback continues with the screen locked, and every sound is stored in the app, so nothing streams overnight.

Is the brown noise here a looping recording?

It's generated, not a recording, so there's no loop point to notice and no repetition to catch.

Can I mix brown noise with other sounds?

Yes — that's the point. Layer it with rain, a fan, a campfire, or anything else, each at its own volume.

Do I need to sign up?

No. sndflo has no account at all — there is no sign-up and nothing to create. Saved mixes are stored on your device.

Get sndflo free on iPhone