Green noise
Noise centred on the middle of the range, around 1 kHz. Fuller than white, lighter than brown.
Timer
Generated in your browser with the same code as the app, nothing to download. Start with your volume low. Keep this tab open.
About this sound
Green noise has no standard technical definition. It usually means noise concentrated in the middle of the audible range, and popular explainers disagree on where that middle is. Ours is centered around 1 kHz: fuller than white noise, lighter than brown, a little like a distant waterfall.
It is white noise passed through a wide band-pass filter at 1 kHz (Q 0.7), so energy falls away gradually above and below the center instead of being cut off. The player generates it live in your browser with the app's code, from a 30-second buffer with a crossfaded seam, level-matched to the recorded sounds.
How people use it
It suits people who find white noise too hissy and brown noise too boomy. No published study has tested green noise for sleep, so the only way to know whether you like it is to listen for a few nights.
Keep it low and away from your pillow. It blends well with water sounds, which share the same midrange, and with a sleep timer that fades out slowly once you are asleep.
Questions
What is green noise?
Noise focused on the middle of the audible range. Unlike white or pink noise it has no formal definition, so different apps mean slightly different things by it. This one is centered around 1 kHz.
Is green noise better for sleep than white noise?
No study has compared them. Green noise has less treble than white noise, so many people find it more pleasant at the same volume.
Mix it with
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Get green noise on your phone
Nightwool is coming to iPhone and Android. One e-mail when it launches, then we delete the list.