Pink Noise — Free Online Generator
Pink noise sits between white and brown — softer than the bright hiss of white, less rumbly than the deep tones of brown. It sounds like steady rainfall, a distant waterfall, or a quiet fan. NoiseMoon generates it procedurally in your browser. No file loop. No upsell. Works offline once installed.
What is pink noise?
Pink noise is a random signal whose power decreases by 3 decibels per octave as frequency rises. That gives it equal energy per octave, which roughly matches how the human ear weights frequency — the basilar membrane responds logarithmically, not linearly. The "pink" name comes from the analogy with pink light: more red (low frequency) than white light. Acoustically, pink noise sits halfway between flat white noise (0 dB/oct) and rumbly brown noise (−6 dB/oct). Naturally occurring pink-noise spectra appear in heart-rate variability, traffic flow, and many other 1/f processes.
What pink noise does
Because pink noise's spectrum tracks the ear's natural sensitivity, it sounds balanced rather than bright or dark — which is why audio engineers use it as the standard reference signal for room calibration and loudspeaker testing. No noise color is universally better. Pink has less high-frequency energy than white and may sound softer; choose what feels comfortable. Many people who try all three treat pink as the "neutral" pick — less harsh than white, less heavy than brown — but the choice is entirely personal.
How to use it
Start at a low, comfortable volume. Use the warm ↔ bright slider to taste; pink sits naturally near the middle of the slider's range. The Wind preset (selected by default on this page) is a pink-base sound with a gentle bandpass filter centered around 800 Hz, giving it the quality of moving air through an open space. Lean toward warm for a darker, quieter feel; dial slightly bright if you want it to cut through more of the room.
Try it in NoiseMoon
NoiseMoon does not time pulses to sleep stages and should not be presented as a memory tool. What it does offer is a continuously generated pink spectrum you can shape: the warm ↔ bright slider tilts the balance in real time, presets like Wind and River layer character on the pink base, and the timer fades the sound out on your schedule. Whether pink feels better to you than white or brown is individual — try each for a session and keep what you like. NoiseMoon is not medical advice; for clinical questions, talk to a clinician.
Frequently asked
Why is it called pink noise?
Same analogy as light: pink light has more red (low-frequency) than white light. Pink noise has more bass than white noise — about 3 dB per octave more, by definition.
Is pink noise better than white noise for sleep?
No noise color is universally better. Pink has less high-frequency energy than white and may sound softer; choose what feels comfortable.
What's the difference between pink and brown noise?
Pink noise rolls off at −3 dB/octave; brown noise rolls off at −6 dB/octave (twice as steep). Pink sounds like steady rainfall or a distant fan; brown sounds like a low rumble or distant traffic.
Does pink noise improve memory?
NoiseMoon does not time pulses to sleep stages and should not be presented as a memory tool.
Can I use pink noise for tinnitus?
You can listen to pink noise for any reason you like; response is individual. NoiseMoon is not a medical device — for tinnitus questions, talk to an audiologist or care team.
Does NoiseMoon work offline?
Yes. Add NoiseMoon to your home screen (PWA install) and the entire app runs offline — no streaming, no buffering. The noise is generated mathematically on your device, sample by sample.