Steady background noise can mask a barking dog, a noisy office or a racing mind, helping you fall asleep or concentrate. But 'white noise' has cousins — pink and brown — that sound noticeably different, and people often find one far more comfortable than the others.
Here's what separates the three noise colours, which tends to suit sleep versus focus, and how to try each one.
What the noise colours mean
The 'colour' of noise describes how its energy is spread across frequencies — the same idea as colours of light.
- White noise has equal energy at every frequency. It sounds bright and hissy, like TV static or a fan. It's excellent at masking sudden sounds, but some people find it harsh.
- Pink noise has more energy in the lower frequencies, so it sounds softer and more balanced — like steady rain or wind through trees. Many people find it the most natural.
- Brown noise (also called red noise) rolls off even more toward the low end, producing a deep rumble like heavy surf or a distant waterfall. It's the gentlest on the ears.
Which is best for sleep?
There's no single winner — it's personal — but a pattern shows up. Many people find pink and brown noise easier to sleep to because the softer, deeper sound is less fatiguing over hours than bright white noise. Brown noise in particular has become popular for its calming, low rumble.
Whatever you choose, keep the volume low. Noise masks distractions by being steady, not loud — a gentle level covers sudden sounds without adding fatigue or affecting your hearing over time.
Which is best for focus?
For concentration in a noisy space, the goal is to cover distracting speech and sudden noises. White or pink noise works well here — bright enough to mask chatter, steady enough to fade into the background. If you find white noise tiring, pink is a comfortable middle ground for long work sessions.
Try all three free
The easiest way to find your preference is to listen. The free White Noise Generator plays white, pink or brown noise generated live in your browser — no app, no downloads, and it never stops to buffer. Start low and switch between them.
White Noise GeneratorWhite, pink and brown noise for focus and sleep.Related focus and sleep tools
- Pomodoro Timer — focus in timed sprints with breaks.
- Sleep Calculator — bedtimes and wake times around sleep cycles.
- Interval Timer — timed work and rest blocks with audio cues.