White Noise
Constant power across all frequencies. Ideal for masking distracting speech.
FREQUENCY: HIGH
Black Noise
Near-silence with a slow drift underneath — presence without sound.
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Sound Library
Calibrated frequencies for deep work and relaxation.
Color Noises
Continuous frequencies for auditory masking.
Brown Noise
Deep, bass-heavy rumble reminiscent of a distant waterfall or thunder.
FREQUENCY: LOW
Pink Noise
Balanced spectrum that sounds more natural to the human ear, like steady rain.
FREQUENCY: BALANCED
Red Noise
Even deeper than Brown noise, focusing heavily on the low-end spectrum.
FREQUENCY: LOW
Black Noise
Near-silence with subtle low-frequency drift. Meditative, like the sound of a quiet room at night.
FREQUENCY: NEAR SILENT
Grey Noise
Psychoacoustically equalized to sound equally loud at every frequency.
FREQUENCY: EQUALIZED
Ambient Sounds
Natural soundscapes recorded in high fidelity.
Rain
Gentle rainfall creating a natural, soothing atmosphere perfect for deep concentration.
SOURCE: RECORDED
Rain on Tent
Rainfall on a tent canvas — cozy, immersive and deeply relaxing for focused work.
SOURCE: RECORDED
Ocean Waves
Rhythmic ocean waves rolling onto shore — a timeless natural soundscape for calm focus.
SOURCE: RECORDED
Wind
Steady breeze flowing through open spaces — airy and expansive for clear thinking.
SOURCE: RECORDED
Forest Stream
A gentle brook flowing through a quiet forest — peaceful and grounding for deep work.
SOURCE: RECORDED
Meadow
Birds and insects in a sunlit meadow — warm, organic ambience for relaxed focus.
SOURCE: RECORDED
Binaural Beats
Brainwave entrainment through stereo frequency offset. Layers with any noise above.
Headphones required for binaural effect
Delta
Deep sleep and healing. Ultra-low 2 Hz beat for total relaxation.
BEAT: 2 Hz
Theta
Meditation and creativity. 6 Hz beat for deep introspection and flow.
BEAT: 6 Hz
Alpha
Calm focus and learning. 10 Hz beat for relaxed concentration.
BEAT: 10 Hz
Beta
Active thinking and energy. 14 Hz beat for alertness and problem solving.
BEAT: 14 Hz
The quietest colour
Black noise is the odd one out. Where the other colours describe how energy is spread across the spectrum, black noise describes its near-absence: a signal that is silent across almost the whole audible range, with only slow movement at the very bottom. Some definitions allow narrow spikes in an otherwise flat-zero spectrum; others treat it simply as engineered silence.
What you hear on FocusNoise is a very slow random drift, generated the same way as brown and red noise but with the smoothing pushed far enough that pitch effectively disappears. It is less a sound than a change in how the room feels.
Who it is for
Total silence is not neutral. In a quiet room every small event — a door, a floorboard, your own swallowing — arrives with nothing to soften it, and for a lot of people that is more distracting than a steady background. Black noise gives you the smallest possible floor: enough to take the edge off sudden sounds, not enough to be something you are listening to.
- Meditation and breathing practice, where a masking layer would intrude
- Deep reading or editing, where any texture pulls attention
- Already-quiet rooms that feel too quiet
- A base layer under binaural beats, which are meant to be heard faintly
Using it as a base layer
Black noise is the default sound behind the Pomodoro focus phase on this site, and it pairs particularly well with the binaural presets. Because it adds almost nothing in the audible range, a binaural track layered on top stays clearly perceptible at low volume, which is how binaural beats are meant to be used.
If black noise turns out to be too little, red noise is the next step up and brown noise the step after that.
Common questions
Is anything actually playing?
Yes — a slow low-frequency drift. It is intentionally close to the edge of audibility. If you hear absolutely nothing on headphones at a normal volume, raise the level a little; if it still reads as silence, that is roughly the intended effect.
What is black noise good for?
Quiet rooms that feel too exposed, meditation, and as a base layer under binaural beats. It takes the edge off sudden sounds without giving your attention anything to grab.
Can I use black noise while sleeping?
You can, though most people prefer pink noise or rain for sleep because a fuller sound covers more of what happens outside the room. Use the Timer if you want playback to stop automatically after a set period.