Sleep Mask is a white noise app designed to help users with sleep or to block out distractions. It offers a range of high-quality white, pink, and brown noise sounds, as well as variations of these. The app is free to download and use, but it does contain ads.

White noise is a combination of different frequencies of sound played at equal intensity. It is similar to white light, which is a combination of all colors in the visible spectrum. Pink noise, on the other hand, emphasizes the bass or lower frequencies of sound. It gets its name from the pinkish color that would result if the same principle were applied to visible light. Brown noise is a variation of white noise that places even stronger emphasis on the lower frequencies, resulting in a deep red color in the light analogy. It is named after the physicist Robert Brown, who discovered Brownian motion.

Sleep Mask - White Noise provides a variety of noise options to help users relax, focus, or sleep better. Whether you prefer white, pink, or brown noise, this app offers a range of soothing sounds to choose from.