---
title: "Sleepyland sound machine"
description: "Mix brown, pink, or white noise with procedural ocean waves and airplane-like rumble for sleep, relaxation, or focus. Free in your browser."
canonical_url: "https://sleepy.land/noise"
last_updated: "2026-08-29"
---

# Sleepyland sound machine

Mix brown, pink, or white noise with procedural ocean waves and airplane-like rumble for sleep, relaxation, or focus. Free in your browser.

Sleepyland is a free browser sound machine. It synthesizes brown, pink, or white noise, procedural ocean waves, and an airplane-like rumble in the page. The sound generator uses no recorded or hosted audio files, product accounts, or server-side audio. Settings are stored on this device; categorical sound mode and session kind can also appear in bounded anonymous production analytics.

Choose Sleep, Relax, or Focus. Each state is a distinct engine recipe with its own rhythm, spectrum, and movement. Energy scales movement depth and pace without changing volume. Tune reveals noise color, shared warmth, independent noise and wave levels, and wave pace. Session plans are Endless, Countdown, and Focus Interval.

## What you can do

- Sleep, Relax, and Focus functional soundscapes with distinct rhythm, spectrum, and movement
- Gentle, Balanced, and Strong Energy without hidden volume changes
- Brown, pink, and white noise synthesized locally in the browser
- Procedural ocean waves with changing swell, foam, wash, and undertow
- Deep airplane-like cabin sound through dark brown-noise shaping
- Independent noise and ocean-wave volume controls
- Live post-mix spectrogram and spectrum curve
- Interactive tap and hold filtered-noise spectrum
- Endless, countdown, and Focus interval sessions with smooth completion
- On-device sound generation and browser-local settings storage

- [Read Sleepyland Research](https://sleepy.land/index.md)
- [View the source on GitHub](https://github.com/hraness/sleepyland)

## Sitemap

See the full [sitemap](/sitemap.md) for every public page.