Cross-platform mobile development has matured considerably since we last compared these frameworks. In 2025, the choice between Flutter, React Native, and Kotlin Multiplatform (KMP) is no longer about whether cross-platform is viable — it clearly is — but about which framework best fits your team, your use case, and your long-term technical strategy.
At StrikingWeb, we build mobile applications with all three frameworks and have developed strong opinions about when each one excels. This updated comparison reflects our real-world experience delivering production apps across industries.
Flutter in 2025 — The UI-First Framework
Flutter has solidified its position as the framework of choice for applications where custom UI and consistent visual experiences across platforms are the top priority. Google's continued investment has resulted in a mature, stable platform with an extensive widget library.
What Has Changed
- Impeller rendering engine — Flutter's new rendering engine has eliminated the jank that occasionally plagued complex animations on earlier versions. Frame rates are consistently smooth even with heavy custom painting and transitions.
- Web and desktop maturity — Flutter for web and desktop has improved significantly. While not yet at parity with mobile for all use cases, it is production-ready for many application types, making Flutter a genuine multi-platform framework.
- Dart language improvements — Dart has continued to evolve with features like pattern matching, sealed classes, and improved null safety that make the language more expressive and safer.
- Package ecosystem — The pub.dev ecosystem has grown substantially, with mature packages for state management (Riverpod, Bloc), navigation (GoRouter), networking, and platform integrations.
Performance Benchmarks
In our testing on mid-range devices, Flutter apps consistently achieve 60fps for standard UI interactions and maintain smooth performance during complex list scrolling with thousands of items. App startup time averages around 300-500ms for cold starts, which is competitive with native. Binary sizes have improved but remain larger than React Native — typical Flutter apps ship at 15-25MB compared to 8-15MB for equivalent React Native apps.
Best For
Flutter excels when you need pixel-perfect custom UI across platforms, heavy use of animations and custom drawing, a consistent brand experience regardless of platform conventions, or a single codebase for mobile, web, and desktop.
React Native in 2025 — The JavaScript Ecosystem Bridge
React Native has undergone a significant architectural transformation with the New Architecture, and 2025 is the year this investment is paying dividends. The framework now delivers performance that closes the gap with Flutter while maintaining its core advantage: access to the vast JavaScript and React ecosystem.
What Has Changed
- New Architecture rollout — The new architecture with Fabric renderer, TurboModules, and JSI (JavaScript Interface) is now the default. This eliminates the old bridge bottleneck, enabling synchronous native module calls and more efficient rendering.
- Static Hermes — The Hermes JavaScript engine now supports ahead-of-time compilation, reducing startup time and improving runtime performance significantly.
- Expo dominance — Expo has become the standard way to build React Native apps, with Expo Router providing file-based routing, EAS Build handling CI/CD, and the Expo SDK providing a comprehensive set of pre-built native modules.
- Server-driven UI — React Server Components concepts are beginning to influence React Native, enabling server-driven UI patterns that reduce app update frequency.
Performance Benchmarks
With the New Architecture and Static Hermes, React Native apps now start in 200-400ms on mid-range devices. JavaScript execution is 2-3x faster than the old architecture. UI thread interactions are synchronous, eliminating the lag that previously occurred when crossing the bridge. For most business applications, the performance difference between React Native and native is imperceptible.
Best For
React Native is the strongest choice when your team has deep JavaScript and React expertise, you need to share code between mobile and web React applications, the app primarily uses platform-native UI patterns rather than heavily custom UIs, or you want access to the vast npm ecosystem for business logic.
Kotlin Multiplatform (KMP) — Shared Logic, Native UI
Kotlin Multiplatform takes a fundamentally different approach than Flutter and React Native. Instead of sharing UI code across platforms, KMP shares business logic — networking, data persistence, state management, validation — while letting each platform implement its own native UI using SwiftUI on iOS and Jetpack Compose on Android.
What Has Changed
- Stable release — KMP reached stable status, giving enterprises the confidence to adopt it for production applications.
- Compose Multiplatform — JetBrains' Compose Multiplatform allows sharing Compose-based UI across Android, iOS, desktop, and web, giving teams the option of shared UI while maintaining the ability to drop down to platform-native UI when needed.
- Growing adoption — Major companies including Netflix, VMware, and Cash App have adopted KMP, validating it for enterprise-scale applications.
- Tooling improvements — The Kotlin IDE experience in Android Studio and Fleet has improved significantly, with better debugging, code navigation, and refactoring support for multiplatform projects.
Performance Benchmarks
KMP compiles to native code on each platform (via LLVM on iOS, JVM on Android), so the shared logic runs at native speed. There is no JavaScript interpreter, no bridge, and no rendering engine overhead. UI performance is identical to native since the UI layer is native. This makes KMP the highest-performance cross-platform option.
Best For
KMP shines when you have existing native mobile teams who want to eliminate duplicate business logic, when platform-native look and feel is non-negotiable, when performance requirements are demanding (games, financial trading, media), or when your Android team already uses Kotlin.
"The choice between these frameworks is not about which one is best. It is about which one is best for your specific team, constraints, and goals. We have built successful apps with all three."
Decision Framework
After building dozens of cross-platform apps, we use this framework to help clients choose:
Choose Flutter When
- Custom, branded UI is the primary requirement
- You want a single codebase for mobile, web, and desktop
- Animation and visual polish are competitive differentiators
- Your team is comfortable learning Dart or starting fresh
Choose React Native When
- Your team has strong JavaScript and React skills
- You need code sharing between mobile and web React apps
- Platform-native UI conventions are important
- Rapid development with a mature ecosystem is a priority
Choose KMP When
- You have existing native mobile teams
- Platform-native UI fidelity is non-negotiable
- You want to share business logic without compromising UI
- Maximum performance is required
The Hybrid Approach
Increasingly, we see organizations adopting hybrid approaches. A common pattern is using KMP for shared business logic while using Compose Multiplatform for screens where cross-platform consistency matters and SwiftUI/Jetpack Compose for screens where platform-native behavior is critical. This gives the best of both worlds at the cost of additional complexity.
At StrikingWeb, we help teams navigate these choices and build mobile applications that meet their business objectives, technical requirements, and team capabilities. Whatever framework you choose, we have the expertise to deliver a production-quality result. Let us discuss your mobile project.