Serenity: White Noise

Serenity plays white noise for sleeping, and it does it without a single audio file. Every texture is synthesized in real time from noise and filters. That means there is no loop point to notice at three in the morning, no download, and the whole app is about a megabyte. SIX TEXTURES Static White, Pink Noise, Deep Rain, Ocean Waves, Night Wind, and Fan / Air. Each one retints the whole screen, so you can tell them apart in the dark. A SLEEP TIMER THAT MEANS IT Tap a preset from 15 minutes to 4 hours, or drag the ring for anything in between. Turn on fade-out and the last minute eases to silence instead of stopping dead. IT KEEPS PLAYING Lock the phone and the sound continues. The Lock Screen shows what is left and pauses without unlocking. BUILT FOR A DARK ROOM Dark only, deliberately. No bright splash, no autoplay video, no paywall that could appear while you are falling asleep. NO ACCOUNT, NO ADS, NO TRACKING No sign-in. No analytics. No network calls of any kind. The privacy label says Data Not Collected because that is literally true.