Pick a sound, press play, put the phone down. Screen can go dark. Stop from the lock screen. 16 sounds: lullabies (Twinkle Twinkle, Brahms, Für Elise), field rain/stream/sea/wind, pink and white noise, heartbeat and womb. Timer 1–90 min or always on. Cry detector listens only when music is off. Room volume on the phone - nothing recorded or sent. No account, no ads, nothing leaves the device. Free.