Kotlin Multiplatform: The True Write Once, Run Everywhere?

In the realm of software development, the quest for the holy grail of “write once, run everywhere” has been ongoing for decades. Java once promised this with its “Write Once, Run Anywhere” mantra. Fast forward to today, and Kotlin Multiplatform (KMP) emerges as a contender in this arena. But can it truly deliver on this age-old aspiration? Let’s unpack the allure of Kotlin Multiplatform and gauge its potential to revolutionize cross-platform development.

Kotlin Multiplatform Unveiled

Kotlin, initially recognized as a modern and concise alternative to Java for Android development, introduced the Kotlin Multiplatform project. KMP allows developers to write, test, and run code for multiple platforms, including Android, iOS, web, and desktop, using a single codebase.

The brilliance lies in its approach: Rather than trying to achieve complete code unification, KMP promotes sharing only the business logic, while UI and platform-specific code remain native. This ensures a genuine native experience for each platform.

Advantages of Adopting Kotlin Multiplatform

  • Code Reusability:Developers can write the business logic once and use it across multiple platforms. This not only speeds up development but also ensures consistent logic across all platforms.
  • Native Experience:By allowing platform-specific code for UI and other native functionalities, KMP ensures that apps feel genuinely native, with optimal performance and familiar user experiences.
  • Flexibility:Kotlin Multiplatform doesn’t enforce a one-size-fits-all approach. Teams can decide how much code they want to share based on project needs.
  • Rich Ecosystem:Kotlin has robust backing from JetBrains and Google, ensuring continuous improvements, extensive libraries, and tooling support.

The Potential Pitfalls

  • Maturity:While rapidly evolving, Kotlin Multiplatform is still relatively new. Some libraries and tooling might not be as mature as those for established platforms.
  • Learning Curve:Developers familiar with Kotlin for Android might need some time to adapt to multiplatform concepts.
  • Risk of Over-abstraction:Pushing for maximum code sharing can sometimes lead to over-abstraction, which might complicate the codebase.

Comparing to the Competitors

Kotlin Multiplatform isn’t the first or only player in the cross-platform game. Tools like Flutter and React Native also promise cross-platform development. However, KMP’s distinct approach of blending shared logic with native UI sets it apart. Rather than providing a wholly unified codebase, it strikes a balance between shared logic and native experience.


Kotlin Multiplatform paints a compelling picture of the future of cross-platform development. While it might not be the mythical “write once, run everywhere” solution in its purest form, it offers a balanced, pragmatic approach that many developers and businesses might find appealing. By harnessing the power of shared logic while not compromising on the native experience, KMP is carving a niche for itself in the vast cross-platform landscape.


  1. Is Kotlin Multiplatform the same as Kotlin Native?
    • No. Kotlin Native is a subset of Kotlin Multiplatform, allowing Kotlin code to be compiled to native binaries. In contrast, KMP is a broader project enabling code sharing across various platforms.
  2. How does Kotlin Multiplatform differ from React Native or Flutter?
    • While tools like React Native and Flutter focus on providing a unified codebase for both logic and UI, KMP emphasizes sharing only the business logic, keeping UI and platform-specific code native.
  3. Do I need to rewrite my existing Kotlin apps to use KMP?
    • Not necessarily. Existing Kotlin codebases can be incrementally adapted to leverage KMP’s features.
  4. Is Kotlin Multiplatform only for mobile app development?
    • No. While mobile is a primary focus, KMP also supports web, desktop, and backend development.
  5. Will apps developed with KMP feel different from truly native apps?
    • Since KMP promotes native UI code for each platform, apps developed using it should feel and perform just like native applications.

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