White noise is broadly spread across the spectrum, low-frequency, midrange, and high-frequency sounds.
White noise has shown promising results related to memory, tinnitus, and concentration (among many other things).

Pink noise is louder at the low-frequency end of the spectrum, and softer at the high end.

Brown noise is even deeper, even stronger, at the low end and without the high-frequency sounds of white and pink noise. Moreover, pink noise and brown noise can improve people’s memory more than white noise.

Discover “Noise” to get a better sleep1

If you have trouble falling asleep or are easily awakened during the night, many sleep specialists recommend trying a sound conditioner or noise machine. In the book “Say Good Night to Insomnia,” insomnia researcher Gregg Jacobs says these devices work in two ways: by blocking distracting noises and by producing soothing sounds that are relaxing and help to induce sleep.