Color Noise Explained: White, Brown, Pink & Every Shade
What is color noise? A complete guide to every noise color — white, brown, pink, green, blue, grey, violet, orange, red, and yellow — with the science behind each.
Why is noise named after colors?
Noise is named after colors by analogy with the visible light spectrum. Just as different colors of light have different frequencies, different "colors" of noise have different distributions of power across the audio frequency spectrum.
White light contains all wavelengths equally — and white noise contains all audible frequencies equally. Red light is at the low end of the spectrum — and red (brown) noise has more energy at low frequencies. The analogy isn't perfect, but it's a useful shorthand.
White noise
Equal power at every frequency. The sound: a consistent, bright "shhh" — like a fan, static, or an air conditioner. The most neutral and widely studied noise color.
Best for: masking sudden sounds, baby sleep, light sleepers, open-plan offices.
Brown noise (red noise)
Power decreases at 6dB per octave. The sound: a deep, heavy rumble — like a waterfall, heavy rain, or airplane cabin. More bass than any other noise color.
Best for: ADHD focus, falling asleep with racing thoughts, deep relaxation.
Pink noise
Equal energy per octave. The sound: between white and brown — more natural and balanced. Sounds like rainfall, rustling leaves, or ocean waves.
Best for: improving deep sleep quality, memory consolidation, meditation.
Green noise
Midrange frequencies emphasised. The sound: warm and organic — where nature lives in the spectrum. Resembles a gentle breeze or distant stream.
Best for: anxiety relief, mindfulness, nature lovers.
Blue noise
Power increases with frequency. The sound: bright and hissy — the opposite of brown noise. Stimulating rather than calming.
Best for: tinnitus masking, staying alert, late-night work.
Grey noise
Calibrated to human hearing. The sound: white noise corrected for the equal-loudness contour of human hearing. Sounds more balanced than white noise — no harsh midrange spike.
Best for: all-day listening, open-plan offices, extended study sessions.
Violet noise (purple noise)
Steepest high-frequency emphasis. The sound: sharp, high hiss. The most high-frequency of all noise colors.
Best for: tinnitus therapy, audiological treatment.
Orange noise
Dissonant musical frequencies removed. The sound: white noise with the "wrong" frequencies taken out — smoother and more harmonically pleasant.
Best for: musicians, music producers, people sensitive to dissonant sounds.
Red noise
Red noise is another name for brown noise. See brown noise →
Yellow noise
Midrange spike around 1–2kHz. The sound: energetic, slightly buzzy. Stimulating rather than relaxing.
Best for: alertness, staying awake.
Which should you try first?
For most people: start with brown noise. It's the current fan favourite for both focus and sleep, and it's what you're most likely to have heard about. If it's not for you, white noise is the most established alternative.
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