Many parents run a steady sound in a nursery, the way a household might run a fan in a bedroom or a radio in a kitchen. This page is about that use — the same free mixer as everywhere else on this site, not a device built or marketed for babies.
Placement matters more than the sound
White noise is preloaded because it's what most nursery machines use; green and brown noise are one tap away, and neither is a lesser choice. Keep the speaker several feet from the crib, never inside or clipped to it — sound intensity falls off quickly over a few feet, so it's far louder up close than it seems from across the room. You choose how long it plays, and it fades out on its own when the time is up; a device left running near a baby for long stretches is worth checking on.
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.
Is this page a sound machine made for babies?
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No. It's the same free mixer as every other page on this site, generating the same three noise colors in your browser. Some parents choose to run one of those noise colors in a nursery the way they would a dedicated sound machine; that's the only reason this page exists, not because anything here is designed or marketed specifically for infants.
Why is white noise preloaded instead of green or brown?
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White noise is the sound most commonly associated with sound machines sold for nurseries, so it's the most likely starting point if you're comparing this mixer to one. Green and brown noise are one tap away and are not a lesser or lower alternative — they're simply different, and some parents prefer one of the others once they've tried all three.
How far from the crib should a speaker be?
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Several feet away at minimum, and never inside or clipped to the crib itself. That distance matters for volume as much as anything else — sound drops off quickly over a few feet, so a speaker close to a crib can be far louder at a baby's ears than it sounds from across the room.
How loud should the sound be?
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Quiet — noticeably quieter than you might set this mixer for yourself in a living room. Keep it low enough that a smoke alarm would still be clearly audible over it, and if in doubt, turn it down further.
Does this page make any claim about sleep, colic, or a baby's health?
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No, deliberately. This page describes a way some parents use background sound near a nursery and the safety details that matter if you choose to. It doesn't say what that sound does for a baby, because that isn't something this mixer, or this page, is in a position to know. A pediatrician is the right person to ask about anything to do with your baby's health or sleep.