A steady rain loop you can play right here. Free, no account, and it repeats without a gap for as long as you leave the tab open.
Steady rain
Paused
This browser couldn't start audio. The app uses its own engine and isn't affected.
Why rain works
Rain is broadband sound. Its energy spreads across the whole frequency range, so it covers the small unpredictable noises that pull your attention away: a door down the hall, a phone alert, a scooter in the street. Nothing about rain makes your brain sharper. It removes the interruptions, and your focus does the rest.
It also carries no information. Speech is the worst sound to work against because your brain insists on decoding it. Rain has texture without meaning, which is why you can read over it but not over a podcast.
When to put it on
Writing sessions in a loud flat. Open-plan offices, with headphones. Nights when the building is so quiet that every creak wakes you. Keep the volume low, just above the noise you want to hide. If you notice the rain itself, it is set too loud.
About this loop
Steady rain with no thunder and no music, taken from the sound library of the Foyer app and looped without a gap. Prefer a storm? The app has downpour and thunder variants, and you can put the thunder far away and the rain close.
Questions
Is rain sound the same as white noise?
They mask other sounds the same way, by covering the frequencies an interruption would arrive on. White noise is synthetic and puts more energy in the high end, which some people find harsh over hours. Rain rolls off at the top, so it feels softer in long sessions. Try both and keep the one you forget is playing. There is a free white noise page here too.
Can I leave it running all night?
Yes. The loop repeats with no gap for as long as the tab stays open. One caveat: phone browsers may pause audio in background tabs. The Foyer app keeps playing with the screen locked and has a sleep timer that fades the room out on its own.
What does the app add over this page?
Placement. This page plays rain flat, in the middle of your head. In Foyer the rain is a point of light you drag around a canvas: push it behind you and it sounds like it is behind you. Distance sets volume, angle sets direction, and each room remembers its whole layout.