Kotlin Multiplatform (KMP) and Compose Multiplatform (CMP) enable sharing business logic and UI code across Android, iOS, web, and desktop while maintaining native performance. KMP allows writing data and business logic once and compiling it to native binaries for each platform, while CMP extends this to shared UI using declarative Compose syntax. Q42 uses KMP in production apps like McDonald's (serving millions across 60+ countries) to eliminate code duplication, reduce bugs, and speed up development. Unlike React Native's JavaScript runtime bridge, KMP compiles to native code with no translation layer, offering better performance and type safety. Teams can choose to share only logic (using native SwiftUI/Compose for UI) or share both logic and UI with CMP, maintaining flexibility for platform-specific customizations when needed.
Table of contents
The duplication dilemmaKotlin Multiplatform: one logic to rule them allCompose Multiplatform: design once, deploy everywhereHow it compares to React NativeWhy we love KMP and CMPWhat’s nextSort: