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Kotlin Multiplatform Mobile (KMM)

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description Kotlin Multiplatform Mobile (KMM) Overview

KMM, championed by JetBrains, focuses on sharing business logic (networking, data models, view models) written in Kotlin, while allowing the UI layer to remain fully native (SwiftUI/Jetpack Compose). This approach offers the best of both worlds: maximum native performance and UI fidelity, combined with significant code reuse for the non-UI business logic. It is the preferred choice for organizations deeply invested in the JVM/Kotlin ecosystem.

help Kotlin Multiplatform Mobile (KMM) FAQ

Is Kotlin Multiplatform Mobile still called KMM?

JetBrains now prefers Kotlin Multiplatform, abbreviated KMP, because the technology targets more than Android and iOS. KMM remains a familiar older name for mobile projects that share Kotlin code.

Can a Kotlin Multiplatform app keep SwiftUI on iOS?

Yes, a shared Kotlin module can contain networking, persistence, validation, and domain logic while the iOS app uses SwiftUI and the Android app uses Jetpack Compose. Swift code consumes the compiled shared framework through generated interop.

Does Kotlin Multiplatform now support sharing the user interface too?

Yes, Compose Multiplatform can share UI code across Android, iOS, and desktop, while web support follows a different maturity path. Teams can still share only business logic when platform-native interfaces are more important.

How is Kotlin Multiplatform different from Flutter or React Native?

KMP lets teams decide how much to share, including the option to retain SwiftUI and native Apple APIs on iOS. Flutter brings its own Dart-based widget system, while React Native commonly uses JavaScript or TypeScript with native platform bridges.

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