- React Native shares UI and logic in JavaScript; KMP shares compiled Kotlin logic and keeps native UI
- React Native has a massive JS talent pool; KMP requires Kotlin and Swift expertise
- KMP adopts incrementally into existing native apps; React Native works best as a full rewrite
- React Native ships faster for small teams; KMP produces apps indistinguishable from native
- Meta, Shopify, and Discord run React Native; Netflix, Cash App, and McDonald's run KMP
React Native and Kotlin Multiplatform solve the same problem (shipping to iOS and Android without doubling your engineering effort) but they draw the sharing line in opposite places.
React Native shares everything: UI, business logic, navigation. You write JavaScript or TypeScript, and the framework bridges to native views. KMP shares compiled Kotlin modules (networking, data, state) and leaves the UI to SwiftUI and Jetpack Compose. One gives you a single codebase. The other gives you a shared core with native surfaces.
Key Differences
Architecture and Rendering
React Native translates JSX components into native platform views. A <TextInput> becomes a UITextField on iOS and an EditText on Android. The New Architecture (JSI, Fabric, TurboModules) replaced the old async bridge in 0.76. JS and native code now communicate synchronously, with 40x faster calls and 43% faster cold starts.
KMP compiles shared Kotlin code to JVM bytecode on Android and native binaries on iOS via Kotlin/Native. The shared layer handles business logic: networking (Ktor), databases (SQLDelight), serialization, and state management. The UI stays platform-native. Each platform renders its own views with zero abstraction overhead.
Compose Multiplatform for iOS reached stable in May 2025 (v1.8.0), giving KMP teams the option to share UI code too. Most production KMP apps still keep UI native.
Language and Developer Ecosystem
React Native uses JavaScript and TypeScript. That means access to npm's massive package ecosystem and the largest developer talent pool in the industry. A React web developer can ship React Native code within weeks. Debugging uses Chrome DevTools and React DevTools.
KMP requires Kotlin for shared code and Swift for iOS UI. Both are modern, expressive languages with strong type systems. The team needs expertise in two languages and two IDEs (Android Studio and Xcode). Kotlin developers are common in Android; finding developers who know both Kotlin and Swift takes more effort.
The trade-off: React Native lowers the hiring bar. KMP raises the quality ceiling for platform-specific work.
Code Sharing Strategy
React Native teams share 70-90% of their codebase across platforms. UI, navigation, state management, and business logic all live in one JavaScript/TypeScript project. Platform-specific code is limited to native modules for features the framework doesn't wrap.
KMP teams share 30-60% of their codebase: the business logic layer. Each platform has its own UI code. That percentage climbs with Compose Multiplatform, but most teams keep UI native for platform fidelity.
The bigger difference is adoption path. KMP drops into an existing native app one module at a time. Share a networking layer this quarter, add a shared data model next quarter. React Native works best as a full commitment. You can embed it in an existing app, but the common path is writing the whole app in React Native.
Maturity and Production Track Record
React Native launched in 2015 and powers apps at Meta, Shopify, Microsoft, Discord, and Coinbase. The New Architecture landed as default in 2024 (0.76) and mandatory in 2025 (0.82). Expo SDK 55 (March 2026) ships with RN 0.83 and handles builds, OTA updates, and CI/CD. The ecosystem is battle-tested.
KMP reached stable in November 2023. It's younger but adopted by engineering-heavy organizations: Netflix, Cash App, McDonald's (6.5M+ monthly purchases, 80%+ shared code), Philips, and VMware. JetBrains and Google both invest in it. The library ecosystem is smaller but production-ready: Ktor, SQLDelight, Koin, kotlinx.serialization.
When React Native Makes Sense
Pick React Native when your team knows JavaScript and you want one codebase for everything.
- Your team has JavaScript/TypeScript or React expertise
- You want maximum code sharing (70-90%) from a single codebase
- You are building a greenfield app and want the fastest path to both platforms
- You want to share code between mobile and web (React Native Web, Expo Router)
- Hiring speed matters and JavaScript developers are plentiful in your market
When Kotlin Multiplatform Makes Sense
Pick KMP when native UI fidelity matters and you want to adopt cross-platform code without rewriting your app.
- You have existing native iOS and Android apps and want incremental code sharing
- Platform look-and-feel is critical to your product (banking, health, enterprise)
- Your team has strong Kotlin and Swift developers who want to keep native UI
- You want shared logic that compiles to native code with zero runtime overhead
- Your Android team already uses Kotlin and can lead the shared module work
The Bottom Line
React Native and KMP sit on opposite ends of the sharing spectrum. React Native shares everything and gives you one codebase, one team, and faster shipping. KMP shares the logic layer and gives you native UI, incremental adoption, and zero abstraction overhead.
If your team knows JavaScript and wants to move fast, React Native is the proven choice. If your team knows Kotlin and Swift, values native UI, or needs to adopt gradually, KMP is the stronger fit. The best choice depends on what your team already knows and how much platform fidelity your product demands.