White vs Pink vs Brown Noise: Which Is Best for Focus and Sleep?
White, pink and brown noise sound different because their energy is spread differently. Here's what each one is, what people use it for, and what the evidence says.
Noise apps have become a staple for studying, working in open offices and falling asleep. Brown noise had a viral moment on social media, with people saying it quieted their racing thoughts. But what's actually the difference between the colours, and does any of it work?
The colours, explained
The colour describes how a noise's energy is spread across frequencies, from low rumble to high hiss.
- White noise has equal energy at every frequency. Because our ears are most sensitive to higher frequencies, it sounds bright and hissy, like radio static or a fan on high.
- Pink noise has less energy as frequency rises: equal energy per octave. It sounds more balanced and natural, like steady rain or wind.
- Brown noise (named after Brownian motion, not the colour) drops off even more steeply. It's mostly low rumble, like a waterfall, heavy surf or distant traffic.
You can hear all three side by side on the noise generator.
Why people use it
Steady noise works mainly by masking: it fills in the background so sudden sounds, like a door, a voice or traffic, stand out less. A sound that changes grabs your attention; a steady one fades into the background.
What the evidence says
The honest summary: mixed, and personal.
- For sleep, some studies have found pink noise associated with deeper sleep, and steady noise helps some people in noisy environments. Others find any noise disruptive.
- For focus, some people, including some with ADHD in small studies, concentrate better with background noise. Others are distracted by it.
- For tinnitus, noise can make ringing less noticeable for a while. Persistent tinnitus is worth discussing with a doctor or audiologist.
There's no colour that works best for everyone. Most people who like noise prefer pink or brown, because white can feel harsh over time.
How to try it well
- Keep it quiet. You want it just loud enough to soften other sounds. Loud noise for hours isn't kind to your hearing, and for babies it should be kept especially low and away from the cot.
- Try each colour for a few days. Your first reaction isn't always your long-term preference.
- Use a timer for sleep. Many people only need noise while falling asleep. The full version of the noise generator includes a sleep timer that fades out.
If you're curious about tones rather than noise, binaural beats are another option, with similarly mixed evidence. Treat both as sounds you might enjoy, not treatments.