The Cross-Platform Promise
Building native mobile apps for both iOS and Android has traditionally meant maintaining two separate codebases in Swift/Objective-C and Kotlin/Java. Cross-platform frameworks promise to reduce this effort by sharing code between platforms. In 2019, React Native and Flutter are the two most compelling options, each backed by a tech giant and growing rapidly.
At StrikingWeb, we have built production apps with both frameworks. This comparison reflects our hands-on experience and aims to help you make an informed decision for your next mobile project.
Architecture Differences
React Native
React Native, created by Facebook, uses JavaScript and React to build mobile interfaces. It works through a bridge architecture: your JavaScript code runs in a JavaScript engine, and when it needs to render UI elements or access device APIs, it communicates across a bridge to the native platform. The actual UI elements rendered on screen are genuine native components (UIView on iOS, android.view.View on Android).
Flutter
Flutter, created by Google, takes a fundamentally different approach. It uses Dart as its programming language and renders everything through its own high-performance rendering engine (Skia). Flutter does not use native UI components at all — it paints every pixel on screen itself using its own widget library. This means Flutter has complete control over every visual aspect and can ensure pixel-perfect consistency across platforms.
Performance
Flutter generally delivers better performance than React Native for several reasons. Because Flutter compiles to native ARM code and renders directly through Skia without a bridge, there is no communication overhead between the application code and the rendering layer. React Native's bridge architecture introduces latency, particularly during complex animations or when passing large amounts of data between JavaScript and native code.
That said, React Native performance is adequate for the vast majority of applications. Unless your app involves heavy animations, complex UI interactions, or data-intensive rendering, the performance difference is unlikely to be noticeable to end users.
Developer Experience
React Native
- Language: JavaScript (or TypeScript), which most web developers already know
- Hot Reload: Fast iterative development with near-instant code reload
- Tooling: Standard JavaScript tooling (VS Code, Chrome DevTools, Jest for testing)
- Learning curve: Low for JavaScript developers, moderate for those new to React
Flutter
- Language: Dart, which most developers will need to learn. Dart is approachable — similar to Java or TypeScript — but it is an additional learning requirement
- Hot Reload: Excellent, with stateful hot reload that preserves application state during code changes
- Tooling: Strong IDE support in Android Studio and VS Code. The Flutter DevTools provide excellent debugging and profiling
- Learning curve: Moderate. Learning Dart is straightforward, but Flutter's widget composition model takes time to internalize
UI Components and Design
React Native uses native platform components, which means your app automatically looks and feels like a native iOS or Android app. The trade-off is that achieving visual consistency between platforms requires platform-specific code for elements that look different on iOS and Android.
Flutter provides its own widget library that includes both Material Design (Google's design language) and Cupertino (iOS-style) widgets. You can create highly custom UIs with full control over every visual element. Flutter excels at custom, branded designs that need to look identical on both platforms.
Ecosystem and Third-Party Libraries
React Native has a more mature ecosystem. It has been available since 2015, and the npm ecosystem provides packages for virtually every need — navigation, state management, maps, camera access, push notifications, and more. However, quality varies significantly between packages, and some popular packages are community-maintained with inconsistent update schedules.
Flutter's ecosystem is younger but growing rapidly. The pub.dev package repository has thousands of packages, and Google actively maintains many core plugins. The consistency of package quality tends to be higher than React Native because of stricter publishing standards and Dart's type system catching more issues.
Community and Job Market
React Native has a larger community and more production apps in the wild. Companies like Facebook, Instagram, Bloomberg, and Walmart use React Native. The job market for React Native developers is well-established, and finding developers with experience is relatively easy.
Flutter is gaining momentum rapidly. Google's investment is substantial, and the community is enthusiastic and growing. Companies like Alibaba, Google Ads, and Reflectly have built production apps with Flutter. The job market is smaller but growing, and Flutter developers are in high demand.
Our Recommendations
- Choose React Native if: Your team already knows JavaScript and React, you need to share code with a React web application, you want access to a larger ecosystem of third-party libraries, or you prioritize native look and feel.
- Choose Flutter if: Performance is a top priority, you want pixel-perfect UI consistency across platforms, you are building a custom-designed app with complex animations, or you are starting a new team without existing JavaScript expertise.
- Consider native development if: Your app requires deep hardware integration, platform-specific features, or the absolute best possible performance (such as games or AR applications).
Both frameworks are production-ready and capable of building excellent mobile applications. The right choice depends on your team's existing skills, your app's requirements, and your long-term development strategy. At StrikingWeb, we help clients evaluate these factors and choose the framework that best serves their mobile goals.