Kotlin Multiplatform vs SwiftUI for Android vs Jetpack Compose for iOS (2025 Comparison)
Published 6 hours ago • 2 mins read
In 2025, the cross-platform development landscape is more exciting—and confusing—than ever. With Kotlin Multiplatform gaining production-grade maturity, SwiftUI getting experimental support on Android, and Jetpack Compose expanding to iOS, developers are faced with real decisions that go beyond “native vs cross-platform.”
So which technology should you choose for multi-platform UI development?
Let’s break it down.
🧩 1. Kotlin Multiplatform Mobile (KMM): True Code Sharing for Business Logic
KMM allows you to share business logic (not UI) across Android and iOS using Kotlin. The UI is still written natively in Jetpack Compose (Android) and SwiftUI (iOS), but backend logic, networking, database access, and more can be shared.
Pros:
- 80–90% code reuse (non-UI)
- Official support from JetBrains and Google
- Works with Jetpack Compose Multiplatform (experimental UI sharing)
Cons:
- Requires writing separate UIs
- Slower adoption in large teams without Kotlin experience
✅ Best for: Teams prioritizing native UI with shared logic, or Kotlin-heavy teams expanding to iOS.
🎯 2. SwiftUI for Android (2025 Experimental Support)
In a surprising 2025 turn, Apple has open-sourced a subset of SwiftUI for Android, allowing developers to build Android apps using Swift syntax and SwiftUI DSL (Domain-Specific Language).
Pros:
- Swift developers can target Android without switching languages
- True declarative UI across platforms
- Integrated with Swift Package Manager and Xcode tooling
Cons:
- Still highly experimental
- Android support is limited and lags behind Jetpack Compose features
- Not ideal for Android-native teams
🚧 Best for: Swift-first teams exploring Android as a secondary platform.
⚙️ 3. Jetpack Compose for iOS (Multiplatform UI)
Jetpack Compose, Android’s powerful declarative UI toolkit, now supports iOS through JetBrains' Compose Multiplatform framework. You can write a single UI codebase in Kotlin and deploy to Android, iOS, desktop, and web.
Pros:
- Shared UI and business logic in Kotlin
- Powerful tooling with Android Studio and IntelliJ
- Great performance with Skia graphics layer
Cons:
- iOS support still maturing; animations and accessibility may lack polish
- Requires deep Kotlin and Compose knowledge
🚀 Best for: Kotlin-first teams looking to ship fast across Android and iOS with a shared UI codebase.
Head-to-Head Feature Comparison
| Feature | Kotlin Multiplatform | SwiftUI for Android | Jetpack Compose for iOS |
|---|---|---|---|
| Language | Kotlin | Swift | Kotlin |
| UI Code Sharing | Partial | Full (SwiftUI DSL) | Full |
| Business Logic Sharing | ✅ Yes | ❌ No | ✅ Yes |
| Production Ready (2025) | ✅ Stable | ❌ Experimental | ⚠️ Beta |
| Community & Support | Growing Fast | Niche | Expanding Rapidly |
| Best For | Native apps with shared logic | Swift-only teams | Kotlin-first cross-platform apps |
🧠 Final Thoughts
- If you love Kotlin and Jetpack Compose, go with Compose Multiplatform — it’s fast, powerful, and almost production-ready for iOS.
- If your team is deep into Swift, the new SwiftUI-for-Android bridge could be a game-changer — just don’t rely on it for complex apps yet.
- If you want the best of both worlds and can handle split UI layers, Kotlin Multiplatform is the most stable and scalable option in 2025.