🌧️ Rain & Ambient Sounds

Synthesized ambient textures for focus & sleep

Master volume 80
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⏱ Sleep Timer

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Sounds fade out smoothly over 10 seconds when the timer ends.

Why Ambient Sounds Help You Focus and Sleep

Our auditory system never fully switches off — even during sleep, the brain continues monitoring the environment for meaningful sounds. This is why a sudden noise wakes you while a continuous sound does not. Ambient noise works by raising the acoustic "floor," making sudden intrusive sounds less jarring relative to the background.

The science of noise colors

White noise contains equal energy at every audible frequency — it sounds like a bright, static hiss. It's effective for masking a wide range of environmental sounds. Pink noise has less energy at higher frequencies (−3 dB per octave), producing a warmer, more natural texture similar to rustling leaves or flowing water. Research has associated pink noise exposure during sleep with improvements in slow-wave activity. Brown noise (also called red noise) reduces by 6 dB per octave — a deep, low rumble like heavy rain or a powerful waterfall. Many people with ADHD report finding brown noise particularly effective for sustained concentration.

How these sounds are made

Unlike other ambient players that stream audio files, every sound here is generated in real time by your browser's Web Audio API — no files are downloaded. White noise uses a random number generator filling an audio buffer. Pink and brown noise use digital filtering of that white noise. Rain is synthesized as filtered brown noise (for the "body" of the rain) combined with randomly timed short bursts (individual droplets). Wind uses a bandpass filter whose center frequency oscillates slowly to create the characteristic "whooshing" quality. The deep hum is a low-frequency sine wave blended with a small amount of filtered noise. These are synthesized ambient textures — not field recordings.

Frequently Asked Questions

Are these real field recordings or synthesized sounds?
These are synthesized ambient textures generated entirely in your browser using the Web Audio API — not field recordings. Rain is filtered brown noise plus random droplet bursts; wind is slow-modulated bandpass noise; white, pink, and brown noise use their standard algorithms. No audio files are downloaded.
What is the difference between white, pink, and brown noise?
White noise has equal energy at every frequency — a bright hiss. Pink noise reduces high frequencies by 3 dB per octave, sounding warmer and more natural. Brown noise reduces by 6 dB per octave, producing a deep, low rumble similar to heavy rain or a distant waterfall. Brown noise is popular for ADHD focus; pink noise is often preferred for sleep.
Can I mix multiple sounds at once?
Yes. All generators can run simultaneously. Try rain + brown noise for deep focus, or gentle rain + deep hum for sleep. Use the individual volume sliders to balance the mix, and the master volume to control overall level.
How does the sleep timer work?
Select a duration and press Start. When the countdown reaches zero, all active sounds fade out smoothly over 10 seconds. The timer uses absolute timestamps (Date.now()) so it stays accurate even if your tab is backgrounded.
Will it work with my screen locked?
On most desktop browsers (Chrome, Firefox, Edge), audio continues when the tab is hidden or the browser is minimized. On iOS Safari, audio may be suspended when the screen locks due to platform restrictions — for reliable overnight use on iPhone, consider keeping the screen awake or using the native Music app.