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Swift vs Kotlin ComparisoniOS vs Android native development, and the real question of whether to go native at all
Swift and Kotlin are both excellent modern languages with null safety, concise syntax, strong type inference, and first-class IDE support. The real decision point isn't Swift vs Kotlin: it's native vs cross-platform. Maintaining two native codebases gives you the best performance, deepest platform integration, and the best user experience. But it costs roughly twice as much to build and maintain. React Native and Flutter exist to collapse that cost, with different tradeoffs.
Head-to-head summary
Detailed comparison
Our verdict
The platform determines the language: Swift for Apple platforms, Kotlin for Android. There is no winner here. If you're building for both platforms natively, you need both. The more interesting question is whether your product needs native at all, or whether React Native or Flutter is the right trade.
When to choose each
Choose Swift when:
- You're building an iOS, macOS, watchOS, or tvOS application: Swift is the only practical choice
- Your product needs deep Apple platform integration: widgets, HealthKit, ARKit, or Siri
- You're targeting Apple's distribution channels and need App Store-native performance
- Your team has existing iOS expertise and Apple platform knowledge
Choose Kotlin when:
- You're building an Android application: Kotlin is the Google-recommended default
- You're building a JVM backend and want a modern alternative to Java
- You want to share business logic across Android and iOS via Kotlin Multiplatform
- Your team comes from a Java background and is already on the JVM ecosystem
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