Noctra Sleep

Noctra Sleep is a new Android app for sleep, focus, naps, and masking everyday noise. It is intentionally ad-free, starts quickly, and includes white noise, brown noise, pink noise, rain, fan, ocean, nature, focus, and baby-friendly sounds.

The part I wanted to make more useful is the on-device room-sound scan: it listens to the surrounding environment and suggests audio that fits the room, so users do not have to guess what to play. There is an optional monthly/yearly premium plan, kept very low-cost, for extra sounds and routines.

Play Store: https://play.google.com/store/apps/details?id=com.aiwhitenoise.noctra