Slumba is a native sleep sounds app for every Apple device — iPhone, iPad, Mac, Apple TV, and Apple Watch. One $2.99 in-app purchase unlocks five mixable presets across all platforms, no subscription, no tracking. Built entirely in SwiftUI with deep Apple integration: Focus Filters, Live Activities, Top Shelf, Apple Watch app. Free download with redemption codes for the full unlock. We'd love feedback from your audience.