Kotlin Multiplatform (KMP) has matured significantly. It's no longer an experimental technology but a stable choice for sharing business logic between Android and iOS.
Shared Logic, Native UI
The core philosophy of KMP remains: share the logic, keep the UI native. This allows for:
- Code Reuse: Networking, data storage, and analytics code is written once.
- Native Experience: iOS users get SwiftUI/UIKit; Android users get Jetpack Compose.
Compose Multiplatform
However, with Compose Multiplatform, you can now share UI code too. While still optional, it's gaining traction for internal tools and simpler apps.
KMP vs. Flutter vs. React Native
| Feature | KMP | Flutter | React Native |
|---|---|---|---|
| Language | Kotlin | Dart | JavaScript/TS |
| UI | Native or Compose | Custom Engine | Native Components |
| Performance | Native | Near Native | Near Native |
KMP is the best choice if you have a strong Android team and want to start sharing code without rewriting your entire iOS app.