I recently shipped MoonSound, an iOS app that combines a full-screen clock, a white-noise mixer and a Pomodoro timer.

The user-facing idea is simple: turn an iPhone or iPad into a calm desk companion. The implementation ended up touching more native iOS APIs than I expected.

The app is built with SwiftUI and an MVVM structure. The main screens are intentionally immersive: clock, focus and sounds live in a paging container, while the navigation controls auto-hide so the device can sit on a desk without feeling like an app screen.

Some implementation details that were interesting:

AVFoundation handles looping sound playback and background audio.

Multiple sound tracks can play at once, each with independent volume.

Sound categories are loaded with on-demand resources instead of putting everything in the initial app binary.

ActivityKit powers the Lock Screen and Dynamic Island focus countdown.

WidgetKit provides clock, focus and sound widgets in home-screen and Lock Screen families.

App Intents expose…