Kotlin Multiplatform :is transforming the way we build modern software by enabling the development of applications that work across multiple platforms from a single codebase. In this article, we will explore what Kotlin Multiplatform is, its benefits, key use cases, and how you can start implementing it in your projects.
What is Kotlin Multiplatform?
Kotlin Multiplatform is a feature of the Kotlin language, developed by JetBrains, that allows sharing business logic and common code across different platforms such as Android, iOS, Web and Desktop, while maintaining the ability to write platform-specific code where needed.
Key Features:
- Codeshare: You can write common logic (such as data handling, validation, or networking) once and reuse it.
The Kotlin compiler takes source code as input and produces a set of platform-specific binaries as output. When compiling cross-platform projects, you can produce multiple binaries from the same code. For example, the compiler can produce both JVM .class files and native executable files from the same Kotlin file:
- Native code support: In the context of Kotlin Multiplatform, it means that you can use the libraries and functionalities specific to each platform without any problems. This is essential to take full advantage of the unique features of each operating system or environment, such as iOS, Android, Web or Desktop.
- Modularity: refers to the ability to split an application into independent parts (modules), allowing you to decide which parts of the code to share between platforms and which t o develop specifically for each one. This provides great flexibility to design your project according to the specific needs of your application.
What does this modularity imply?
- Shared code for common logic: You can write a portion of code that is platform-independent (such as data handling, validations, or business logic) and reuse it across platforms.
- Independent code for specific functionalities: If certain parts of your app are unique to a platform (for example, the user interface or functionality unique to Android or iOS), you can develop them separately without interfering with the shared parts.
- Construction in parts: By using a modular approach, you can add or modify a module without having to alter the entire application. For example, if you decide to use Kotlin Multiplatform just to share networking logic at first, you can gradually expand it to include other functionalities.
By using a modular approach, you can add or modify a module without having to alter the entire application. For example, if you decide to use Kotlin Multiplatform just to share networking logic at first, you can gradually expand it to include other functionalities.
What would be “widgets” in the context of Kotlin Multiplatform?
In Kotlin Multiplatform, a “widget” could refer to:
- Shared Logic Components:
- Classes, functions, or structures that encapsulate common logic (such as validations, data handling, or business rules).
- Although they do not directly control the user interface, these “widgets” serve as a basis for native platforms to implement their own visual components.
- UI Abstractions (in certain cases):
- Some developers use external libraries or tools like Kotlin Compose Multiplatform to build reusable cross-platform interfaces. In this case, a “widget” could be a reusable visual component created with Compose.
- Adapted native implementations:
- Each platform (Android, iOS, Web) can implement its own visual version of a widget, while using the same shared logic.
Libraries for Widgets in Kotlin Multiplatform. Although Kotlin Multiplatform does not have native widgets, you can use libraries like:
Jetpack Compose Multiplatform (from JetBrains): It allows you to create shared interfaces using Jetpack Compose, which generates similar visual components across Android, iOS, and Desktop.
KMP-NativeCoroutines + Native Widget Declaration:
Use libraries that facilitate the integration of shared logic with specific platformsUsing Kotlin Multiplatform (KMP) offers numerous advantages for modern software development, especially if you work on applications that need to run on multiple platforms (Android, iOS, web, desktop, etc.) Key advantages:
Code reuse
Shared logic: You can write important parts of your application, such as business logic, validations, data models, database access, or network management, once and reuse them across different platforms.
Flexibility
Gradual integration: Kotlin Multiplatform doesn’t force you to rewrite your entire application. You can introduce it gradually into an existing project, starting by sharing small modules (como lógica de red o modelos de datos).
No framework limitation: You are not restricted to a full-fledged framework like Flutter or React Native. You can use Kotlin Multiplatform only where necessary and keep the specific parts native to each platform.
Easier maintenance
With a single, shared codebase for common logic, any changes or bug fixes affect all platforms. This simplifies maintenance and reduces the risk of inconsistencies between versions.
Native performance
Although you share the logic, platform-specific parts (such as the user interface) are native, ensuring optimal performance and a smooth user experience.Advantage over other cross-platform solutions: Unlike frameworks like Flutter or React Native, which rely on rendering engines or middle layers, Kotlin Multiplatform allows applications to directly use native tools and components.
Kotlin Ecosystem
Kotlin is a modern, concise, and secure language, with features like:
Null-safe handling.
Being developed by JetBrains (creators of IntelliJ IDEA) and backed by Google, Kotlin has a strong and ever-growing ecosystem.
Cost and time reduction
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- Time saving: By writing less code and sharing logic across platforms, development is faster.
- Lower cost: Companies can reduce the resources required as a team can work on a single shared codebase instead of separate teams for each platform.
When is Kotlin Multiplatform useful?
Kotlin Multiplatform is especially useful if:
- You are developing a mobile application for Android and iOS with common
- You need to synchronize logic between the backend and the frontend.
- You want to maintain a clean and efficient codebase across cross-platform projects.
- You work in a team with experience in Kotlin or want to gradually integrate it into existing projects.
Conclusion
Kotlin Multiplatform is a powerful and flexible solution for developing cross-platform software. Its unique approach of sharing only business logic, while maintaining native user interfaces, makes it an ideal choice for developers looking for efficiency without compromising performance or customization.
If you’re looking for a way to streamline cross-platform development while maintaining quality and control, Kotlin Multiplatform is a technology you should explore. Get started today and take your projects to the next level!