Guide / Updated 24 October 2026
White vs pink vs brown noise: what changes?
The colors describe how a noise signal spreads its energy across frequencies. White sounds brighter, pink sounds softer, and brown emphasizes low rumble. None is automatically a better sleep aid. Source ↗
- White noise has a brighter, hiss-like balance.
- Pink noise reduces the upper frequencies relative to white.
- Brown noise puts much more weight in the low end.
- A quiet level and suitable speaker matter more than the color name.
How to try it
Try all three at the same quiet speaker setting before choosing. The tool changes the signal, but it does not measure the sound level at your ear. If a color hides the specific interruptions you notice without making the room feel loud, it is a useful fit for that room.
- Set the speaker in its bedtime position and lower its hardware volume.
- Play white, pink and brown in turn while keeping the device level fixed.
- Pick the texture you can ignore most easily, then reduce it to the lowest useful level.
- Add a timer and check that a locked screen does not interrupt your chosen playback setup.
What to consider
For a sharp hiss from a vent, pink may feel less sharp than white. For low traffic rumble, brown can be pleasant yet may cover little speech. Move the speaker and lower its level before trying to drown out every outside sound.
What the color labels really describe
The names come from how energy is distributed across the audible range. In an ideal white-noise signal, each equal-width frequency band receives comparable energy. Because the ear and a speaker do not treat every frequency equally, that does not sound subjectively flat. Most listeners notice a bright, airy hiss. Pink noise reduces energy as frequency rises. Brown noise falls more steeply still and emphasizes a rolling low end. These are descriptions of a signal spectrum, not a rating of how sleepy or safe the sound is.
The generator above makes each color in real time with a Web Audio worklet. White uses fresh random samples; pink and brown apply different filters to those samples. The output is an approximation of the named colors, intended for listening and comparison. It is not calibrated to a laboratory spectral tolerance. No microphone input or recorded sound is involved, so switching colors does not use a track from the SleepMix app.
How they sound on an ordinary speaker
White noise often makes the strongest first impression because its higher frequencies are easy to hear on a small phone speaker. Pink can feel smoother, while brown can seem very soft if that speaker cannot reproduce bass. A larger speaker may reverse your first impression of brown noise by making its low frequencies audible. Keep the hardware volume fixed when comparing colors, then set a final comfortable level after choosing. A matched slider value does not mean matched perceived loudness.
Room placement changes the sound as well. Put the speaker on a stable surface away from the pillow, then listen from the place where you actually rest. A wall, corner or bedside cabinet can boost or dull parts of the spectrum. If a color sounds harsh, lowering the level is the first adjustment. If it still bothers you, another color or silence may be a better choice than more volume.
Match the sound to the interruption
A steady background can reduce the contrast between a quiet room and a short noise. The color that helps depends on what is interrupting you. White may cover some sharper sounds better, but its hiss can itself be distracting. Pink is a middle ground for someone who wants continuous texture without as much brightness. Brown may feel comfortable under low rumbles, yet its missing high end can leave a chirp, a click or a voice exposed. The generator cannot erase a sudden horn or stop a neighbor from making noise.
Try the least intrusive sound that makes the room more predictable. You can also change the room rather than the signal: close a door gap, move a fan that rattles, or shift the bed away from a shared wall. These steps may let you play at a much lower level. If the bedroom is already quiet, adding noise has little to mask and may be unnecessary.
What sleep research can and cannot tell us
People often ask which color is best for sleep, but existing studies do not support a universal ranking. A systematic review of noise as a sleep aid found inconsistent evidence and called for better measurements before broadly recommending continuous noise. Another review of auditory stimulation found varied methods and results across white and pink interventions. Research on precisely timed pink-noise pulses is also different from leaving ordinary pink noise on continuously in a room.
A useful personal test is simpler than a medical claim. Keep bedtime and room conditions as consistent as possible, then compare several nights with gentle background sound and several without. Notice whether you fall asleep more easily, whether the sound wakes you, and whether you prefer silence in the morning. If you need a louder and louder level to feel an effect, reconsider the setup instead of treating volume as the solution.
A listening test you can finish tonight
Begin with your device and speaker at a low setting. Press Play, listen to white for roughly a minute, then switch to pink and brown without changing the device volume. Do not pick the color only from its name. Ask whether you can ignore the sound while reading a few lines or lying still. If brown vanishes on your phone, try a different speaker at a fresh low level before deciding you dislike it.
Next, consider the real sound you want to mask. Wait for an ordinary interruption if it occurs naturally; do not generate a loud test noise. The best background is usually the quietest one that softens that interruption without demanding your attention. Set a sleep timer if you only need sound while settling in. Add a fade when an abrupt stop is noticeable. The browser may suspend audio after a device lock, so test that behavior before relying on overnight playback.
Volume matters more than a color
White, pink and brown can all be played too loudly. The tool’s volume percentage controls a digital gain value. It cannot report the sound pressure level reaching your ears, because it does not know your speaker, system volume, room or distance. NIDCD hearing guidance explains why intensity and duration both matter for noise exposure. Use the lowest comfortable setting and take breaks if you are listening for a long time.
For an infant, use a more cautious setup. The American Academy of Pediatrics advises placing a sleep machine as far away as possible, setting it as low as possible and limiting its duration. No color makes a loud speaker automatically safe for a child. Do not place a phone or sound machine inside a cot.
When the browser is enough, and when to use the app
This page is a quick way to hear the three basic noise colors. It needs no account and creates audio locally. The installable browser version can cache the generator for an offline revisit where service workers are supported. Browser background-audio rules differ across devices, so keep the tab open during a first test and check how your own phone behaves when locked.
SleepMix for iPhone adds a larger sound library, saved mixes, separate levels for each sound, a sleep timer and optional bedtime controls. The app includes recordings as well as named noise sounds; this website does not reuse its audio files. If a simple steady signal meets your need, stay here. If you want to return to a layered mix or control a routine from the phone, the app is the more flexible option.
Common questions
Which color sounds most like a fan?
That depends on the fan. A smooth fan hum may feel closer to pink or brown, while a small fan with a lot of airflow hiss may resemble white. Use the buttons to compare with the real fan in your room.
Is brown noise quieter than white noise?
No. Brown describes how the signal favors low frequencies. Actual loudness depends on your speaker and its volume, so a powerful bass speaker can make brown noise very loud.
Can I layer the three colors here?
The browser tool plays one color at a time so you can compare them clearly. SleepMix is designed for layered sound mixes with separate level controls.
Does pink noise improve deep sleep?
Continuous pink noise should not be confused with precisely timed research stimulation. Current reviews do not establish that playing ordinary pink noise all night improves deep sleep for everyone.