What is green noise?
Green noise is noise concentrated in the middle of the audible range, around 500 Hz, with the deepest bass and the highest treble turned down. It went viral on social media in 2023 as a sleep sound, often described as “the sound of nature”.
Unlike white, pink and brown noise, green noise has no agreed scientific definition. Some engineers have called it the “background noise of the world”, the average spectrum of outdoor environments; most sleep apps use it to mean noise shaped around the mid range. We follow that common meaning: pink noise with a broad, gentle boost around 500 Hz and soft roll-offs below about 120 Hz and above about 2,200 Hz.
What does it sound like?
Green noise sounds like a waterfall heard from a short distance, wind moving through a forest canopy, or waves on a far-off beach. It lacks both the hiss of white noise and the deep rumble of brown, which is exactly why people like it: it is present without being sharp or heavy.
Green noise vs pink and brown noise
| Pink | Green | Brown | |
|---|---|---|---|
| Emphasis | Even across octaves | Mid range, around 500 Hz | Low frequencies |
| Feels like | Steady rain | Forest, waterfall | Distant thunder, engine |
| Treble | Moderate | Low | Very low |
| Bass | Moderate | Low | High |
If green noise feels a little too narrow, add a small amount of pink noise to widen it. If it is too bright, mix in brown noise.
Is green noise good for sleep?
There is no research on green noise specifically, because it only recently gained a name. It does share the main benefit of other steady noise: it masks sudden sounds. Because it carries much of its energy in the range of the human voice, it can be effective at blurring conversation or a TV through a wall, while staying softer than white noise.
Try it at a low volume with the sleep timer, and combine it with the Stream or Wind layers for a more natural scene.
Frequently asked questions
Is green noise a real type of noise?
It is a real sound, but not a formally defined noise color like white, pink or brown. The name is used for noise focused on the mid frequencies around 500 Hz. Different apps shape it slightly differently.
What is green noise good for?
Mostly sleep and relaxation. It masks voices and household sounds while staying softer than white noise and less bassy than brown noise.
Why does green noise sound like nature?
Many outdoor sounds, such as wind in leaves and falling water heard from a distance, concentrate their energy in the mid range because distance and foliage absorb the highest and lowest frequencies.