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Kotlin Multiplatform

Go cross‑platform without compromising performance, UX, or code quality

  • Android
  • iOS
  • Web
  • Desktop
  • Server
Get Started
https://youtu.be/RJtiFt5pbfshttps://youtu.be/5lkZj4v4-kshttps://mp.weixin.qq.com/s/yRwkbQxFsRBNZW3Z-S1A8Qhttps://youtu.be/uCkYZ-PvCmwhttps://medium.com/@charankumar-hm/our-journey-with-kotlin-multiplatform-from-curiosity-to-production-eeb788b620dahttps://youtu.be/Qu3jZX8RyFkhttps://engineering.block.xyz/blog/how-bitkey-uses-cross-platform-developmenthttps://youtu.be/GtJBS7B3eyMhttps://builders.travelperk.com/compose-multiplatform-at-perk-a-pragmatic-look-at-our-journey-so-far-fedd666e9726https://youtu.be/Qu3jZX8RyFkhttps://youtu.be/jhBmom8z3Qghttps://kotlinlang.org/lp/multiplatform/case-studies/down-doghttps://netflixtechblog.com/netflix-android-and-ios-studio-apps-kotlin-multiplatform-d6d4d8d25d23https://youtu.be/DcO9psUh4LIhttps://quizlet.com/blog/shared-code-kotlin-multiplatformhttps://blog.worldline.tech/2022/01/26/kotlin_multiplatform.htmlhttps://touchlab.co/https://kotlinlang.org/lp/multiplatform/case-studies/fastwork
https://youtu.be/RJtiFt5pbfshttps://youtu.be/5lkZj4v4-kshttps://mp.weixin.qq.com/s/yRwkbQxFsRBNZW3Z-S1A8Qhttps://youtu.be/uCkYZ-PvCmwhttps://medium.com/@charankumar-hm/our-journey-with-kotlin-multiplatform-from-curiosity-to-production-eeb788b620dahttps://youtu.be/Qu3jZX8RyFkhttps://engineering.block.xyz/blog/how-bitkey-uses-cross-platform-developmenthttps://youtu.be/GtJBS7B3eyMhttps://builders.travelperk.com/compose-multiplatform-at-perk-a-pragmatic-look-at-our-journey-so-far-fedd666e9726https://youtu.be/Qu3jZX8RyFkhttps://youtu.be/jhBmom8z3Qghttps://kotlinlang.org/lp/multiplatform/case-studies/down-doghttps://netflixtechblog.com/netflix-android-and-ios-studio-apps-kotlin-multiplatform-d6d4d8d25d23https://youtu.be/DcO9psUh4LIhttps://quizlet.com/blog/shared-code-kotlin-multiplatformhttps://blog.worldline.tech/2022/01/26/kotlin_multiplatform.htmlhttps://touchlab.co/https://kotlinlang.org/lp/multiplatform/case-studies/fastwork

Choose what to share

Maximum reuse, faster delivery.

Use Kotlin with Compose Multiplatform to share up to 100% of your app code – including UI – while still integrating with native APIs. Reduce dev time, ensure consistent behavior, and ship on Android, iOS, desktop, and web from a single codebase.

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both-logic-ui

One logic layer, native experience.

Write your app's data handling and business logic once with Kotlin Multiplatform while keeping the UI fully native – perfect when UX precision is key and platform fidelity matters.

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logic-native-ui

Stabilize and sync critical features.

Start by sharing an isolated, core part of your business logic – like calculations, validation rules, or authentication workflows – to improve consistency across platforms without requiring major architectural changes.

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piece-of-logic

Choose where to share

Easily make your Android app cross-platform while keeping the majority of your Kotlin code.
Many popular libraries and architecture components – including those from Google, such as Room, DataStore, or ViewModel – can be used with Kotlin Multiplatform.

Share business logic seamlessly. Make your Kotlin functions available to call from Swift code, and use the full power of iOS APIs in your Kotlin code.
Use Compose Multiplatform to create screens that can be embedded in SwiftUI, or build the entire user interface in Kotlin. Easily use platform-specific views like MapKit or AVFoundation straight from your Kotlin code.

Share business logic with your web application via Kotlin/JS or take full advantage of code sharing by bringing your app’s UX to the browser using Compose Multiplatform and Kotlin/Wasm.

Use Kotlin with Compose Multiplatform to build cross-platform desktop applications with shared business logic and a consistent UI across Windows, macOS, and Linux – hardware-accelerated rendering included!
Use the well-established Kotlin and JVM ecosystems to quickly create your next desktop app.

Build your server-side applications with a modern JVM language, and use Kotlin Multiplatform to share data models, validation logic, and more.
Use a framework like Ktor to get familiar APIs not just on the server, but also on the client, and maximize the amount of code and knowledge you can reuse.

AI-powered code generation

Speed up your multiplatform coding with code generation powered by Junie, the coding agent by JetBrains.

Seamless tooling

Enjoy smart IDE support with the KMP plugin for IntelliJ IDEA and Android Studio, with common previews, cross-language navigation, refactorings, and debugging across Kotlin and Swift code.

KMP presence among the top 10K apps doubled year over year.

KMP apps

Real-world success stories

duolingo
“One exciting trend for Duolingo is that the more that we use Kotlin Multiplatform internally, the more we find ourselves speeding up in terms of shipping. It turns out after you learn something, you get really good at it. […] Now there's a lot more confidence behind it and we're building up that knowledge.”
John Rodriguez
The client platform team
google-workspace
“We consider Kotlin Multiplatform validated in our Google Docs experiment […] we consider the experiment a success […] We’re actually very happy with it”
Jason Parachoniak
Multiplatform Lead in Google Workspace
mcdonalds-umain

“After a successful initial test with the payments feature, we expanded Kotlin Multiplatform to our entire McDonald's application. With KMP, we saw fewer crashes and better performance across both platforms after the launch.

We transitioned from a separate Android and iOS team to a more unified mobile team.”

Varsha Singh
Project Manager, McDonald’s app at Umain
“Starting from this small of a team, it was a huge speed win for X to be able to use Kotlin Multiplatform and write all of that logic once in one place… When you write a bug—not that I ever do that—you only have to fix it in one place.”
Eric Denman
Software Engineer at X
forbes
By sharing over 80% of logic across iOS and Android, Forbes now rolls out new features simultaneously on both platforms, keeping the flexibility to customize features based on the specific platform. This allows the team to innovate and respond to market needs faster.
Read the full story
bilibili
BiliBili (China version) has adopted Kotlin Multiplatform and Compose Multiplatform for the Instant Message feature.
Read the full story
bilibili case
h&m
H&M adopted Kotlin Multiplatform to build a shared feature-toggle library for their Android and iOS apps. This approach enabled the team to unify their experimentation logic, reduce duplicate code, and smoothly deliver a production-ready solution across platforms.
Read the full story
Explore more customer stories
Kotlin Multiplatform is a technology that allows you to create applications for various platforms and efficiently reuse code across them while retaining the benefits of native programming. Your applications will run on iOS, Android, macOS, Windows, Linux, and more.
Kotlin Multiplatform is the core technology that lets you share code – such as business logic, data models, networking, and more – across multiple platforms, including Android, iOS, desktop, web, and server. It focuses on code reuse without replacing the native UI unless you want it to.
Compose Multiplatform is an optional UI framework built on top of Kotlin Multiplatform. It allows you to share your user interface across platforms using a modern, declarative approach similar to Jetpack Compose on Android. You can use it to build visually appealing, responsive UIs for Android, iOS, desktop, and web from a single codebase.
Yes, Kotlin Multiplatform is production-ready for all supported platforms – Android, iOS, desktop, web, and server. Compose Multiplatform is stable for Android, iOS, and desktop, while the web target is currently in Beta.

Choose Kotlin Multiplatform when you need:

  • Incremental adoption: KMP lets you share code selectively – start with a single module or expand to your full app at your own pace.
  • Native performance: KMP compiles to native code for each platform with no bridges or VMs, ensuring high performance and responsiveness.
  • Truly native UI with Compose Multiplatform: Compose Multiplatform respects each platform's UI conventions, offering a native-feeling experience across Android, iOS, desktop, and web.
  • The same tools and architecture as Kotlin and Jetpack Compose: Your skills will transfer easily, reducing onboarding and ramp-up time.
  • Direct access to platform APIs: You can call native APIs directly – with no wrappers needed and zero time wasted waiting for framework updates.
  • Escape hatches for native code: You can write fully native code where needed (e.g. for performance-critical components), without having to abandon the cross-platform approach.
Learn more about KMP and Flutter and KMP and React Native.
No. You can start small by sharing a module or feature and integrating it into your existing app. KMP is designed for gradual adoption, making it easy to incrementally introduce cross-platform code.

Go cross-platform without compromises —
try Kotlin Multiplatform today.

Get Started