Green noise isn't a recording of anything — it's a signal, built fresh in your browser the moment you press play, with more energy in the middle of what ears hear and less at the extremes. That shaping is what gives it a rounder, steadier character than white noise, which spreads evenly and reads as brighter by comparison.
Closer to a river than a hiss
Think of it as a stand-in for a river, or steady rain on a roof — smoother than the real thing, since nothing in it rises or varies the way an actual place does. If you want the real thing, this site also carries night wetland, a genuine field recording with a named recordist and place. Set the volume where it disappears into the background, rather than demanding attention, and see what you think.
Listen safely
This is a sound, played back through whatever speaker or headphones you already own. It doesn't diagnose, measure, or promise anything about how you sleep, focus, or feel — it's just noise and a handful of real recordings, mixed the way you like them.
Keep the volume low enough that you'd still notice a smoke alarm, a phone ringing, or someone at the door. If you fall asleep in headphones, choose a volume and a pair you'd be comfortable wearing all night, and a session length that ends when you'd want the sound to stop.
If you use this near a baby, keep the speaker several feet from the crib, never inside or clipped to it, and keep the volume low — the same care you'd take with any sound machine in a nursery.
If your relationship with sound, or with sleep, feels difficult rather than simply restless, a doctor or audiologist is the right person to talk to. This is a mixer, not a clinician.
What is green noise, exactly?
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It's a version of noise with more energy in the middle of the audible range and less at the very top and bottom, which is roughly where a lot of ordinary outdoor sound sits — rain, wind through leaves, a river a few hundred feet away. White noise spreads its energy evenly across every frequency you can hear, which is why it sounds thinner and more hissy by comparison.
Is green noise a recording of something real?
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No. It's generated live by your browser from mathematical noise, the same way white and brown noise are. Nothing about it is a field recording, and it never claims to be — the real recordings on this site are the ones marked with a place and a recordist.
How is it different from brown noise?
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Brown noise leans even further down, toward the low end — closer to a distant engine or a heavy rumble. Green noise sits a step up from that, roughly where a rushing river or steady rainfall lives. Which one sounds better to you is mostly a matter of taste.
What volume should I use?
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Quiet enough that you could hold a conversation over it without raising your voice. Noise that's loud enough to fully mask other sound in a room is louder than most people need.
Does it loop or repeat in a way I'd notice?
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It's generated continuously, not looped from a short sample, so there's no seam or repeat to notice, however long you leave it running.