Sleep Sound Mixer

Sleep Sound Mixer is a simple offline ambient audio mixer. Combine generated rain, ocean, and soft noise layers, adjust each level, set a countdown timer, and keep playback running in the background while you use your device. All sounds are generated on device. The app does not require an account, network service, microphone, photo library, location, ads, subscriptions, in-app purchases, or external payments. It is an ambient listening utility, not a medical or sleep treatment app.