The short answer
Native Swift and cross-platform frameworks solve different problems. Swift gives you one app built with Apple’s own tools for iPhone, iPad and Mac. React Native and Flutter give you one code base for iPhone and Android.
The right choice depends on three questions. Where are your users? Which device features does the app need? Who will maintain the code in two years?
The three options in one paragraph each
Swift and SwiftUI are Apple’s language and interface framework. Apple uses them for its own apps and releases new features in them first. An app in Swift runs only on Apple devices.
React Native is Meta’s open source framework. You write the app in JavaScript or TypeScript, and it draws native iPhone and Android components. It suits teams that already build websites in React.
Flutter is Google’s open source framework. You write the app in Dart, and Flutter draws every pixel with its own engine. The app looks the same on iPhone and Android.
React Native vs Swift vs Flutter: comparison table
| Criteria | Swift (native) | React Native | Flutter |
|---|---|---|---|
| Platforms from one code base | iPhone, iPad, Mac, Apple Watch | iPhone and Android, web with extra work | iPhone, Android, web and desktop |
| Language | Swift | JavaScript or TypeScript | Dart |
| New iOS features | Available when Apple releases them | Through native modules or community libraries | Through plugins or platform code |
| Look and feel | Apple’s standard controls | Native controls, shared layout | Its own drawn interface |
| Widgets, Apple Watch, Live Activities | Written in Swift | Still need Swift code | Still need Swift code |
| Hiring pool | iOS developers | Large web and JavaScript pool | Smaller, growing pool |
| Cost for iPhone and Android | Two apps to build and maintain | One shared code base | One shared code base |
| Cost for iPhone only | One app | One app plus a framework layer | One app plus a framework layer |
The table shows the trade-off. Cross-platform saves work when you need both platforms. Native saves work when you need only Apple’s platforms or deep access to them.
When React Native or Flutter is the better choice
Cross-platform is the better choice in these cases:
- You need Android on launch day. Many US consumer apps need both stores from the start. One shared code base gets you there with one team.
- Your team already writes React. React Native lets your web developers ship the mobile app and share business logic.
- The app is mostly forms and lists. Booking, ordering and internal company tools rarely need deep iPhone features.
- You want one custom design everywhere. Flutter draws the same interface on every device.
In these cases, a React Native or Flutter studio will serve you better than Carvalho Karsten.
When Swift is the better choice
Native Swift is the better choice in these cases:
- Your users are on iPhone and Mac. Many business, health and creative apps start on Apple devices only.
- The app depends on Apple features. Widgets, Apple Watch, HealthKit, Apple Pay, Siri and Live Activities all use Swift code, even inside a cross-platform app.
- You want the app to grow into iPad and Mac. SwiftUI shares most of the interface code across Apple devices.
- You care about long-term upkeep. Each iOS release changes something. A native app has one layer to update, not two.
Flutter vs Swift and React Native vs Swift: the maintenance question
Every app needs updates after launch. Apple releases a new iOS every year, and the App Store sets minimum SDK versions for new submissions.
In a native app, you update the Swift code and Xcode. In a cross-platform app, you also wait for the framework and each plugin to support the new iOS. Neither path is free, so count maintenance in your budget. The app development cost guide shows how.
What it costs to switch later
Moving from React Native or Flutter to Swift means rewriting the screens. Your server, database, design and App Store listing can stay. Plan the first version with the platform you expect to keep for several years.
What Carvalho Karsten does
Carvalho Karsten builds only native apps for iPhone and Mac, in Swift and SwiftUI. The studio’s own Mac apps (Devbelt, Limpador, WhereIsMyRAM, NoteAssistant and Adega) are all native.
If your project fits Swift, the project review gives you scope, price and schedule. If it needs Android on day one, the review says so and explains why. You can also read about MVP app development or hiring an iOS developer.