Noise Machine: white noise, green noise, brown noise, and pink noise for sleep, focus, relaxation, and meditation. 🎁 Enjoy classic green, brown, pink, and white noise FREE forever, and try out 16 more like deep green noise, super deep brown noise, and ambient white noise, perfect for sleep and focus. Noise Machine is a premium sound machine app featuring four “colors”: • Brown Noise (or Red Noise) has a rich, deeper character like a roaring ocean. We recommend brown noise for sleep, and it's