White, Pink, Brown & Other Noise Colours for Sleep and Focus

Noise colours are just steady washes of sound with the loudness shared out differently across pitches. White noise is bright and even, brown noise is deep and bassy, and pink noise sits between the two. The colour you want depends on whether you are trying to fall asleep, hold your focus, or cover a noisy room.

Here is what each one is, in plain terms, with the honest note on what the research says.

White noise

White noise spreads equal energy across every pitch, which makes it sound like a bright, steady hiss, close to an untuned radio or a fan on high. It is the best studied of the colours. White noise can mask sudden sounds and helps some people fall asleep or concentrate by smoothing the background into one even wash.

The catch is that bright edge. Over a long night some people find white noise a little harsh, which is where the softer colours come in.

Pink noise

Pink noise eases off the higher pitches, so it sounds more balanced and natural, a lot like steady rain or a distant waterfall. That gentler tilt makes it easier on the ears for long stretches. Early studies have linked pink noise to deeper sleep and better memory in some people, though the research is still young.

If white noise feels too sharp, pink is the natural next step.

Brown noise

Brown noise drops the high pitches further again, leaving a deep, low rumble like heavy surf or a far-off waterfall. It has become a favourite for focus and sleep because it covers distractions without any brightness at all. The formal research is thin, but the popularity is real, and many people simply find it the most comfortable to sit with.

Start with the brown noise track if you want the deepest, calmest of the three.

The newer colours

Beyond the classic three, this site also offers a few less common shades:

• Green noise is an informal, mid-focused hush, often likened to the background hum of the outdoors. There is no strict standard for it, so treat it as a calm middle ground between pink and brown.
• Grey noise is tuned so it sounds roughly equally loud at every pitch, rather than measuring flat on a meter. Many people find it the most balanced and least harsh for long sessions.
• Blue and violet noise tilt the other way, toward the treble. They are bright and airy, sometimes used to mask high-pitched sounds, and best kept at a low volume.

How to choose

For sleep, drift down the scale: try pink first, then brown if you want it deeper, or grey if bright and bassy both bother you. For focus and masking a busy room, white and brown are the usual picks. For covering a specific high-pitched annoyance, blue or violet can help.

There is no single right answer. Open a colour, let it run for a few minutes, and keep the one your attention stops noticing. You can also layer a quiet noise colour under a tone in the mixer to build something that suits the moment.