The sound library

Brown noise (a.k.a. red noise) puts more energy into low frequencies, giving it a deep, soft rumble like distant surf or heavy rain. Many people find it less harsh than white noise and use it to fall asleep, concentrate, and quiet tinnitus.

White noise contains every frequency at equal power — a bright, static-like hiss. It excels at masking abrupt noises (traffic, a snoring partner, an open-plan office), which is why it is the classic choice for focus and light sleepers.

Pink noise softens the high end of white noise for a fuller, more natural sound — think steady rain or wind in the trees. Research has linked pink noise to deeper, more stable sleep.

Green noise emphasises the middle of the spectrum — the ambient hum of the natural world, close to the sound of a calm ocean. It is a soothing, less fatiguing option for long relaxation and meditation sessions.

The steady patter of rain on a roof is one of the most-loved sleep sounds — rhythmic, unthreatening and endlessly variable, it gives a busy mind something gentle to settle on.

Rain falling through a forest canopy blends water with the soft depth of leaves and distant birdsong — immersive enough to carry you somewhere calm while you sleep, read or work.

Low, rolling thunder under a wash of rain — dramatic yet strangely comforting from indoors. The deep rumbles double as natural low-frequency masking, close in character to brown noise.

A full, broadband cascade of water — dense enough to blanket a noisy room, smooth enough to unwind to. A natural cousin of white and pink noise.

A mountain stream running over rock — bright, bubbling and alive. Its gentle irregularity keeps you present without demanding attention, making it a favourite for focused work.

The slow inhale-and-exhale of waves on sand is naturally paced close to restful breathing, which is why the shoreline is such a powerful cue to slow down and let go.

Steady coastal wind is a soft, airy broadband sound — a subtler alternative to rain or white noise for masking a room while you sleep or concentrate.

The pops and crackle of a wood fire carry a deep, primal comfort. Warm and irregular, it is ideal for winding down in the evening or setting a calm mood to read and reflect.

A small, close stream — quieter and higher than a river, with a light, glassy texture that sits nicely in the background of focused work.

Beta-range binaural beats layer two slightly different tones — one per ear — to create a perceived pulse associated with alert, focused attention. Best experienced with headphones.

Delta-range binaural beats aim for the slow frequencies of deep sleep — a soft, low pulse to help you drift down. Use headphones and a comfortable, low volume.