Green noise
Green noise emphasises the middle of the frequency range, around 500 Hz, which is roughly where the background hum of the outdoors sits. It is the newest and least formally defined of the noise colours, and it is generated here in your browser rather than streamed.
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- What it sounds like
- Like a wooded hillside at a distance — less hiss than white, less rumble than brown.
- Best for
- People who find white noise sharp and brown noise too heavy.
Green noise is the least standardised of the colours
White, pink and brown have precise definitions in signal processing. Green does not. It is generally taken to mean noise with the mid-band emphasised, near 500 Hz, on the argument that this is where ambient outdoor sound is loudest. Different generators implement it differently, so two green noise pages can legitimately sound unlike each other. Ours is pink noise with a gentle peak at 500 Hz.
What the research says: nothing, yet
There is no published research on green noise specifically. Anything you read claiming it is scientifically proven to improve focus or sleep is extrapolating from work on white or pink noise, or inventing it. That does not make it useless — masking works regardless of the spectrum, and comfort matters over an eight-hour day — but it does mean the honest answer is that nobody has measured it.
Frequently asked
What is green noise?
Noise with its energy concentrated in the middle frequencies, around 500 Hz, roughly matching the background hum of the natural outdoors. Unlike white, pink and brown it has no formal engineering definition, so implementations vary.
Is green noise scientifically proven?
No. There is no published research on green noise specifically. The studies people cite are about white or pink noise. Masking sudden sounds is a real effect that applies to any steady background, but claims about green noise in particular are not evidence-based.
Green noise vs brown noise — which should I use?
Comfort, not science, should decide it. Brown is heavier and deeper, green sits in the middle and is closer to being outdoors. Play each for a few minutes; the one you stop hearing is the one to keep.
Is it free and ad-free?
Yes. No account, no adverts, nothing to install, and no audio file to download — the sound is generated on your device.
Other noise colours
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