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Kotlin Multiplatform

Write once, ship native

A hand-picked guide to Kotlin Multiplatform.

Official docs and tooling, production-grade libraries, sample apps, recommended reading, and the people moving cross-platform Kotlin forward.

Android · iOSfirst-class mobileDesktop · WebJVM & WebAssemblyexpect / actualplatform glue
Updated May 2026·Curated by Jared Rummler
Where to start
Kotlin MultiplatformJetBrains' overview of the technology, supported targets, and use cases.Get Started GuideOfficial documentation for setting up and structuring your first project.Compose MultiplatformJetBrains' declarative UI framework for sharing screens across platforms.Multiplatform SamplesCurated official sample projects maintained by the Kotlin team.Kotlin Multiplatform BlogRelease notes, roadmaps, and deep dives straight from JetBrains.Kotlin–Swift InteropediaReference for how Kotlin declarations look once exported to Swift.
Library shelf
KtorktorioAsynchronous multiplatform HTTP client and server framework from JetBrains.KtorfitFosoRetrofit-style typed HTTP client built on Ktor and KSP.Apollo KotlinapollographqlStrongly typed, caching GraphQL client for the JVM and Kotlin Multiplatform.Krossbowjoffrey-bionCoroutine-based WebSocket and STOMP client for multiplatform projects.rsocket-kotlinrsocketRSocket binary protocol over TCP, WebSockets, and other transports.
Built with Kotlin Multiplatform
chrisbanestivi

TV-show tracker built with Compose Multiplatform and a modern KMP architecture.

Production
msasikanthtwine

Material You RSS reader for Android and iOS, fully built with Kotlin Multiplatform.

Production
IReaderorgIReader

Multiplatform book and content reader with an extensible source system.

Production
joreillyPeopleInSpace

Minimal sample tracking people in space across mobile, web, desktop, and wearables.

Sample
joreillyConfetti

Conference app showcasing KMP, Compose, GraphQL, and wearable targets.

Sample
joreillyFantasyPremierLeague

Fantasy Premier League stats app running on every Compose Multiplatform target.

Sample
xxfastNYTimes-KMP

A New York Times reader running on Android, iOS, desktop, and the web.

Sample
SEAbdulbasitMusicApp-KMP

Music-streaming UI sample shared across mobile and desktop.

Sample
touchlabKaMPKit

Opinionated Kotlin Multiplatform starter kit and reference app from Touchlab.

Starter
Kotlinkmp-basic-sample

The official basic Kotlin Multiplatform sample from JetBrains.

Starter
JetBrainscompose-multiplatform-template

Official project template for getting started with Compose Multiplatform.

Starter
Recommended Reading
Kotlin Multiplatform by TutorialsKodeco TeamKotlin in Action, Second EditionIsakova, Aigner, Elizarov & JemerovSimplifying App Development with KMMSimplifying App Development with KMMRobert Nagy & Ar Reum LeeKotlin Coroutines: Deep DiveMarcin Moskała
The core idea

Share logic, not compromises.

Models, networking, persistence, and business rules live in commonMain. Each platform stays fully native — expect/actual declarations bridge anything that genuinely differs.

Optional UI layer

Compose Multiplatform shares the UI too.

When you want a single UI, JetBrains' Compose Multiplatform renders the same declarative screens on Android, iOS, desktop, and the web — or drop down to SwiftUI and Views per platform.

People worth following