White noise: energy is evenly distributed across frequencies, sounding like the hiss of a TV with no signal. It is useful for masking high-frequency noise such as keyboards or speech, especially for light sleepers or noisy environments.

Pink noise: high frequencies are gently reduced, so it sounds softer and fuller than white noise. Rainfall and wind through leaves are natural forms of pink noise. It often suits sleep and everyday focus.

Brown noise: energy leans strongly toward low frequencies, removing sharpness. It can sound like distant thunder, a waterfall, or deep ocean movement. It often suits deep relaxation and anxiety relief.

Yes. White noise and pink noise help sleep mainly through two mechanisms. The first is masking: covering sudden sounds such as traffic or doors so sleep is less likely to be interrupted. The second is signal anchoring: the brain learns to associate that sound with sleep, making it easier to settle when the sound begins. Multiple studies, including a 2021 review in Sleep Medicine Reviews, support this effect.

The key is volume, not the type of noise. If the volume stays below 60 dB, roughly around 60% of normal headphone volume, long-term use is generally safe. In contrast, staying in noisy environments such as open offices for long periods can accumulate hearing stress. White noise can help you achieve a masking effect at a lower perceived volume.