Rain, on greensound, means jungle rain, a real field recording with natural variation from moment to moment, paired with brown noise in the Focus mix. Whether rain or a plain noise color suits a study session better is a matter of preference; this page describes what is playing, not which works better.
Rain or a noise color?
Jungle rain carries some natural variation moment to moment, being a real recording rather than a formula, where brown, green and white noise have none by design, each generated the same way every time. This page does not rank one above another for studying.
Does it work in a library or dorm?
Headphones add background sound in a library or a dorm room without adding to the room's own noise for anyone else. A lower speaker volume is the alternative away from headphones, the same guidance as anywhere else on this site.
Where the sound comes from
Brown noise. Made in your browser, not a recording.
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.