Whitest Noise is a free sound player for iPhone, iPad and Android that lets people who like a steady sound in the background while they wind down choose from twenty noise and ambient sounds, press play and set a timer that fades to silence.

Twenty white noise and nature sounds that play offline

The library covers white, pink and brown noise, a soft fan and an air conditioner, and recorded rain, ocean waves, rainforest, underwater ambience, a flowing stream, a waterfall, distant thunder, a fireplace, crickets, forest birds and open-field wind. Train, airplane and ambient sounds round it out. All twenty sounds are included and play offline, so there are no sound downloads and no account or subscription to set up.

The timer ends when you expect it to. Let a sound play until you stop it, or choose a total duration from one minute to twelve hours and decide how much of that time fades gently to silence. The fade is part of the total, so a thirty-minute timer finishes in thirty minutes.

Favorite sounds stay within easy reach. The interface is dark, an optional Dark screen hides the player, and sound continues in the background with playback controls on the lock screen. Use a comfortable volume: Whitest Noise is a sound player, not a medical treatment or an alarm.

Whitest Noise is free, with no in-app purchases. On iPhone and iPad it is supported by a banner on the app's Home screen, with advertising audio muted by default; the Android version from Google Play has no ads. It is available today on the Apple App Store and on Google Play.