- React Native bridges JS to native views. Flutter draws its own pixels. KMP shares logic and keeps native UI
- React Native taps the massive JS talent pool. Flutter requires Dart. KMP needs Kotlin and Swift
- Flutter shares the most code (UI + logic). KMP shares the least but produces the most native result
- React Native and Flutter work best as full rewrites. KMP adopts one module at a time
- All three ship production apps at Meta, Google, Netflix, BMW, Shopify, and McDonald's
React Native, Flutter, and Kotlin Multiplatform all solve the same problem: shipping to iOS and Android without doubling your engineering effort. They draw the sharing line in different places, and that shapes everything about how you adopt, staff, and ship.
React Native shares UI and logic in JavaScript. Flutter shares everything through its own rendering engine in Dart. KMP shares compiled Kotlin logic and leaves the UI to each platform. None is universally better. The right choice depends on your team, your product, and how you want to adopt.
Key Differences
Rendering Approach
React Native translates JSX components into native platform views. A <TextInput> becomes a UITextField on iOS and an EditText on Android. Your app inherits platform look-and-feel by default. The New Architecture (JSI, Fabric, TurboModules) replaced the old async bridge, making JS-to-native calls 40x faster.
Flutter bypasses native views entirely. Its Impeller engine draws every pixel using Metal on iOS and Vulkan on Android. The app looks identical on both platforms. The trade-off: Flutter widgets do not pick up OS-level UI changes automatically.
KMP does not have an opinion on rendering. Your Android UI uses Jetpack Compose. Your iOS UI uses SwiftUI. Each platform renders its own native views with zero abstraction. Compose Multiplatform (stable for iOS since May 2025) adds optional shared UI, but most teams keep UI native.
Language and Hiring
React Native uses JavaScript and TypeScript. That opens the largest developer talent pool in the industry. A React web developer can ship React Native code in weeks. npm gives you access to hundreds of thousands of packages.
Flutter uses Dart. Few developers write Dart before joining a Flutter team. It is straightforward to learn from Java or TypeScript, but ramp-up time is not zero. Flutter leads the JetBrains Developer Ecosystem Survey, but React Native job postings outnumber Flutter 2:1 in North America.
KMP uses Kotlin for shared code and Swift for iOS UI. Both are modern languages with strong type systems. The team needs expertise in two languages and two IDEs. Kotlin developers are plentiful on Android. Finding engineers who know both Kotlin and Swift takes more effort.
Code Sharing Scope
React Native shares 70-90% of code across platforms: UI, logic, navigation, and state management. Platform-specific code is limited to native modules. One codebase, one team, one PR per feature.
Flutter shares even more. UI, logic, navigation, and rendering all live in one Dart codebase. The framework handles platform differences internally. Code sharing reaches 90-95% for apps that do not need heavy platform integration.
KMP shares 30-60% of code: the business logic layer. Networking, databases, serialization, and state management live in shared Kotlin modules. Each platform writes its own UI. The percentage climbs with Compose Multiplatform, but most production teams keep UI native.
Ecosystem Maturity
React Native launched in 2015. It powers apps at Meta, Shopify, Microsoft, Discord, and Coinbase. The New Architecture became mandatory in 0.82 (2025). Expo SDK 55 handles builds, OTA updates, and CI/CD. The ecosystem is battle-tested and the community is large.
Flutter launched in 2018. Google, BMW, Toyota, Alibaba, and Nubank ship with it. pub.dev has over 45,000 packages. Google maintains first-party plugins for common platform APIs. The ecosystem is mature and growing.
KMP reached stable in November 2023. Netflix, Cash App, McDonald's, Philips, and VMware use it. The library ecosystem is smaller but production-ready: Ktor, SQLDelight, Koin, kotlinx.serialization. JetBrains and Google both invest in it actively.
Adoption Path
React Native works best as a full commitment. You can embed it in an existing native app, but the common path is writing the whole app in React Native. Migration from native is a rewrite, not a gradual transition.
Flutter follows the same pattern. The add-to-app approach exists but most teams start fresh. A Flutter screen embedded in a native app adds the full engine to your binary.
KMP is built for incremental adoption. Share a networking layer this quarter. Add a shared data model next quarter. Your existing native apps keep running. No rewrite required. This is KMP's strongest differentiator for teams with established native codebases.
When React Native Makes Sense
Pick React Native when your team knows JavaScript and you want maximum code sharing with native platform behavior.
- Your team has JavaScript/TypeScript or React expertise
- You want to share code between mobile and web (React Native Web, Expo Router)
- Your app uses standard platform components (lists, forms, navigation)
- Hiring speed matters and JS developers are plentiful in your market
- You want a large, mature ecosystem with battle-tested libraries
When Flutter Makes Sense
Pick Flutter when you want total control over your UI and the fastest iteration cycle for a new project.
- You need a custom, branded UI that looks identical on iOS and Android
- Your app is animation-heavy with complex custom widgets
- You are starting a greenfield project and want maximum development velocity
- You want to target mobile, web, and desktop from one codebase
- Your team is willing to learn Dart or already has Flutter experience
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 apps and want incremental code sharing
- Platform look-and-feel is critical (banking, health, enterprise)
- Your team has strong Kotlin and Swift developers who want 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, Flutter, and KMP sit at different points on the sharing spectrum. React Native shares UI and logic in JavaScript with native views. Flutter shares everything through its own engine. KMP shares logic and keeps the UI native.
Pick React Native if your team knows JS and wants native platform behavior. Pick Flutter if you want pixel-perfect consistency and the fastest iteration. Pick KMP if you value native UI fidelity and need to adopt gradually. The best framework is the one your team can ship with.