1. Black noise
Black noise, is simply silence.
2. White noise
White noise is comprised of an equal amount of every frequency, all played at once. It happens in real life when your TV or radio makes static noise.
Pretty much any other color is basically a slight variation on white noise, based on a rough comparison between the frequency spectrum and the colour spectrum.
3. Pink noise
Pink noise is essentially bass-boosted white noise, where the amplitude decreases as the frequencies get higher. It got its name thanks to the pink/violet hues present at the lowest frequencies of light. This is the perceptually ‘balanced’ white noise that many are comfortable with; a lot of ‘white noise machines’ actually play something that’s a lot closer to pink noise.
4. Red noise
5. Brown noise
Brown noise is the only colour not on the the colour spectrum (although some people do call it red noise for that reason). Its namesake is Brownian motion, the term that physicists use to describe the way that particles move randomly through liquids.
Brown noise is even bassier than pink noise; while pink noise boosts bass to adjust for human ears, brown noise boosts bass a bit more, just to further warm things up. This noise is similar to the sound of waves crashing or winds roaring, so if you’re a fan of the sea, brown noise might be the noise for you!
6. Blue noise
Blue noise is, unsurprisingly, the opposite of pink noise. Rather than being bass-boosted, it’s treble-boosted, and the frequencies are so high that most of them are barely even perceptible to us. It sounds pretty similar to the hiss that occurs when you stick your thumb in a hose with running water—a high, screechy tone.
7. Violet/Purple noise
In a similar vein to blue, some people also use violet noise, which has even louder high frequencies than blue noise (violet is to blue as brown is to pink). These aren’t particularly useful for helping you sleep, but they have an important application in audio dithering.
8. Grey noise
Grey noise is very similar to pink noise, but with one key difference. While pink noise approximates a curve to adjust for all human ears, grey noise is tailored specifically by scientists for each person who uses it.
Grey follows a much less general curve, with more specific dips and jumps at certain frequencies to accommodate one’s unique frequency response. It’s used to treat hearing problems like tinnitus and hyperacusis, and doesn’t have many popular use cases outside of medicine.
9. Green noise
Green noise amplifies mid-range frequencies with uniform intensity. Green noise sounds are perceived as similar to ocean waves or a stream. There is limited research that shows green noise benefitting sleep, but background noise can help mask noisy environments that disrupt sleep.
10. Orange noise
Orange noise is a custom variation of pink noise focused on low frequency energy for your ambient listening enjoyment.
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