Is Kotlin Multiplatform

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Is Kotlin Multiplatform?

As a developer who has worked with Kotlin extensively, I am often asked whether Kotlin is a multiplatform language. In this article, I will delve deep into this question, exploring the capabilities of Kotlin as a multiplatform language and sharing my personal experiences and insights along the way.

Kotlin’s Multiplatform Nature

One of the standout features of Kotlin is its ability to be used as a multiplatform language. This means that you can write code once and target multiple platforms such as Android, iOS, and even web applications. It provides a seamless development experience by allowing code-sharing between different platforms, reducing duplication and increasing code reusability.

One of the key components of Kotlin’s multiplatform nature is the concept of “expect” and “actual” declarations. The “expect” keyword is used to declare an interface or a set of common functions that are expected to be implemented on each platform. On the other hand, the “actual” keyword is used to provide platform-specific implementations for those expected declarations.

For example, let’s say we have an application that needs to display a list of products. We can define an “expect” declaration for a getProductList() function that returns a list of products. Then, on each platform (Android, iOS, etc.), we can provide an “actual” implementation for that function, specific to that platform.

By using this approach, we can share a significant amount of code between platforms while still having the flexibility to provide platform-specific implementations when needed. This greatly reduces development effort and helps ensure consistent behavior across different platforms.

Personal Experience with Kotlin Multiplatform

Having worked on a project where we utilized Kotlin’s multiplatform capabilities, I can say that it has been a game-changer for our development process. It allowed us to share business logic and utility functions across Android and iOS platforms, significantly reducing code duplication and improving overall code maintainability.

We were able to leverage Kotlin’s multiplatform capabilities to build a common networking layer, data models, and even user interface components that could be used across both platforms. This not only saved us a considerable amount of development time but also helped us deliver a more consistent user experience on different devices.

Kotlin’s multiplatform nature also brings a sense of unity to our development team. Instead of having separate codebases for each platform, we were able to collaborate more closely, sharing code and working together to solve problems. It fostered a sense of camaraderie and teamwork, which I believe has positively impacted our overall productivity.


In conclusion, Kotlin is indeed a multiplatform language that offers seamless code sharing between different platforms. Its “expect” and “actual” declarations enable developers to write common code that can be utilized across Android, iOS, and web applications. Based on my personal experience, I can confidently say that Kotlin’s multiplatform capabilities have revolutionized the way we develop cross-platform applications.

If you are considering building an application that targets multiple platforms, I highly recommend exploring Kotlin’s multiplatform features. It has the potential to streamline your development process, improve code maintainability, and foster collaboration within your development team.