The Apple ecosystem has undergone a seismic shift. A few years ago, the discussion in engineering offices revolved around whether SwiftUI was production-ready. Today, that question is obsolete. The most awarded, fluid, and profitable apps on the App Store are built upon the declarative foundations of Swift and SwiftUI.
For an iOS developer, analyzing these applications is not just an exercise in admiration, but a study necessity. Seeing how others have solved complex problems regarding navigation, state management, and animations in SwiftUI is the fastest way to elevate your seniority level.
In this article, we will dissect the current best applications that demonstrate the power of SwiftUI across iOS, macOS, and watchOS. We won’t just tell you what they are, but which code patterns and architecture make them shine.
The Rise of Declarative Development
Before diving into the list, it is crucial to understand why these apps stand out. The shift from UIKit to SwiftUI isn’t just syntactic; it’s mental. The apps we are about to see leverage:
- Single Source of Truth: Masterful use of
@State,@Binding, and dependency injection. - Adaptive Layouts: Code that works on an iPhone SE and an iPad Pro without infernal
AutoLayoutconstraints. - Fluid Animations: Transitions that would require hundreds of lines of code in UIKit are here achieved with a simple
.transition(.scale).
If you are looking to master Swift and become a benchmark in iOS development, these are your references.
1. Flighty (iOS & Live Activities)
The crown jewel of modern design.
If there is one app that converts SwiftUI skeptics, it is Flighty. It is a flight tracker that has won multiple Apple Design Awards.
Why is it important for an iOS Developer?
Flighty is the perfect example of early adoption of new technologies. Its integration with Live Activities and the Dynamic Island is arguably the best on the market.
- What to study:
- MapKit and SwiftUI: Flighty renders flight paths over interactive maps with astonishing fluidity. Observe how they overlay SwiftUI views on top of map components.
- WidgetKit: Their entire Live Activity interface is made in pure SwiftUI. Handling real-time data updates (Push Notifications updating the view) is a masterclass in energy efficiency and memory management.
- Implicit Animations: Notice how information cards expand and contract. There are no “jumps”; everything is a smooth interpolation, likely using
matchedGeometryEffect.
Technical Lesson: Flighty proves that SwiftUI is performant enough to handle large volumes of real-time data without blocking the Main Thread.
2. Craft (macOS, iOS, iPadOS)
The paradigm of “Write once, deploy everywhere.”
Craft is a documents and notes app that challenged Notion. Surprisingly, a large part of its codebase is shared between Mac, iPad, and iPhone thanks to SwiftUI.
Why is it important for an iOS Developer?
Many developers fear using SwiftUI on macOS because AppKit has historically been more robust. Craft shatters that myth.
- What to study:
- Complex Layouts: Craft isn’t a simple list. It is a rich text editor with blocks, images, and links. Managing a
ScrollViewwith thousands of nested interactive elements requires absolute mastery ofLazyVStackand cell optimization. - Adaptability (Size Classes): Observe how the Sidebar behaves on the iPad vs. the Mac. They use
NavigationSplitViewnatively to offer an experience that feels “desktop” on Mac and “touch” on iPad. - Gestures: Drag & Drop support for text blocks is native. Implementing this in SwiftUI requires understanding the
.onDragand.onDropmodifiers and the SwiftTransferableprotocol.
- Complex Layouts: Craft isn’t a simple list. It is a rich text editor with blocks, images, and links. Managing a
Technical Lesson: If you want to develop for the full Apple ecosystem, Craft is proof that you don’t need to learn AppKit separately. A solid SwiftUI foundation scales.
3. Ice Cubes (Open Source)
The open textbook for learning architecture.
Ice Cubes is a client for Mastodon. Unlike the previous ones, this app is Open Source. This means you can go to GitHub right now and read its code. For a student or a professional in iOS development, this is pure gold.
Why is it important for an iOS Developer?
Because you can see the “guts” of the project. Thomas Ricouard, its creator, has built a fast and modular app.
- What to study:
- Modularization with Swift Package Manager (SPM): The app is not a monolith. It is divided into small, independent packages (features). This improves Xcode compile times and allows working on isolated features.
- Dependency Injection: Examine how it uses the SwiftUI
Environmentto pass network and authentication services through the view hierarchy. - Component Design: You will see how generic reusable components (buttons, timeline cells) are created, making the code clean and maintainable.
Technical Lesson: Download the Ice Cubes repository. Try to compile it. Change a view. There is no better SwiftUI course than breaking and fixing a real app.
4. Crouton (iOS & watchOS)
Recipe management and the power of watchOS.
Crouton is a recipe management and meal planning app that stands out for its clean design and its excellent companion app for the Apple Watch.
Why is it important for an iOS Developer?
Development for watchOS is often ignored, but it is where SwiftUI shines brightest, as it is the only modern native framework for building interfaces on the watch.
- What to study:
- Hierarchical vs. Paged Navigation: On the watch, Crouton uses
TabViewwithPageTabViewStylefor recipe steps, allowing the user to swipe easily with flour-covered fingers. - Data Synchronization: Study how it uses
WatchConnectivityorCloudKitso that what you add on the iPhone appears instantly on your wrist. - Sensor Usage: The app keeps the screen on while you cook. This involves interacting with system APIs from the SwiftUI view lifecycle.
- Hierarchical vs. Paged Navigation: On the watch, Crouton uses
Technical Lesson: Simplicity is hard. Crouton teaches how to distill a complex iPhone interface down to the essentials on a 40mm screen.
5. Creator View: RocketSim (macOS Developer Tool)
Developer tools, made by developers.
RocketSim is a utility for Mac that enhances the Xcode simulator. It allows screen recording, adjusting device bezels, etc. And yes, its modern interface is made with SwiftUI.
Why is it important for an iOS Developer?
It demonstrates that SwiftUI is not just for consumer apps, but for powerful system utilities.
- What to study:
- Floating Windows and Menus: RocketSim often lives as a floating window or in the menu bar. Creating these interfaces on macOS with SwiftUI requires understanding
WindowGroupand transparent window styles. - System Interaction: The app executes terminal commands and scripts. Seeing how a reactive UI responds to asynchronous system processes is a great lesson in Swift concurrency (async/await).
- Floating Windows and Menus: RocketSim often lives as a floating window or in the menu bar. Creating these interfaces on macOS with SwiftUI requires understanding
Common Patterns: What do they all have in common?
If we analyze the source code (or behavior) of these “Super Apps,” we find patterns that every iOS Developer must master to get hired in 2024 and beyond:
1. Charts and Data Visualization
Almost all use Swift Charts (introduced in iOS 16). They no longer depend on heavy third-party libraries.
- Tip: Learn to use
Chart,BarMark,LineMark, and how to customize them.
2. Modern Navigation
They have all abandoned NavigationView in favor of NavigationStack and NavigationSplitView.
- Tip: Handling the
path(navigation history) as a bound array (Binding) of data is the current standard for deep linking and programmatic navigation.
3. Responsive Design with ViewThatFits
To make the app look good on an iPhone Mini and an iPhone Pro Max, these apps use ViewThatFits and the Layoutprotocol, allowing the interface to decide what to show based on available space.
How to Start Your Path to This Level
Reading about these apps is the first step, but to become an expert in Swift and SwiftUI, you need to get your hands dirty.
- Replicate UI: Take a screen from Flighty or Crouton and try to recreate it in Xcode pixel by pixel. Don’t worry about data logic at first, just the UI.
- Contribute to Open Source: Go to the Ice Cubes repository. Look for an “issue” marked as “good first issue” and try to solve it.
- Adopt New APIs: Don’t get stuck in iOS 14. Experiment with iOS 17 and 18 APIs. The best apps are always on the cutting edge.
Conclusion
The job market for the iOS developer has matured. It is no longer enough to know how to put a button on the screen. Companies are looking for professionals who understand SwiftUI architecture, know how to create reusable components, and can deploy to iOS, macOS, and watchOS simultaneously.
The applications we analyzed today are beacons in the industry. They aren’t perfect, but they prove that with SwiftUI, the limit is no longer the technology, but your imagination.
Open Xcode, create a new project, and start building the next app that will appear on this list.
If you have any questions about this article, please contact me and I will be happy to help you 🙂. You can contact me on my X profile or on my Instagram profile.
