Migrating Your App from React Native to Flutter

A project with 50 screens using Redux and react-navigation doesn't turn into a Flutter app in two weeks. Dart is a different language, the Skia/Impeller rendering model and state management patterns require a systematic approach. Without a deep audit, you risk losing performance and accumulated functionality. After migration, performance increases by 30–40%, and screen load times drop to 0.8 seconds — but this is only achievable with a well-thought-out architecture.

We draw on ten years of experience: dozens of projects of varying complexity. We guarantee preservation of functionality and improved performance. The process includes the full cycle: from auditing the current codebase to deployment to stores. Contact us for a detailed audit — we will evaluate the timeline and cost of migration.

Why Migrating from React Native to Flutter Is a Non-Trivial Task

No Direct Component Analog

In React Native, FlatList with keyExtractor, renderItem, and getItemLayout is a familiar construct. In Flutter, ListView.builder works similarly, but SliverList with SliverChildBuilderDelegate is a whole different level. Developers coming from RN often use Column + SingleChildScrollView where CustomScrollView with slivers is needed, and they get jank on long lists.

Navigation

In React Native, the navigation ecosystem lives in react-navigation with Stack, Tab, and Drawer concepts. In Flutter, the official path is Navigator 2.0 with Router and RouteInformationParser, which is more complex. In practice, we migrate to go_router (recommended by the Flutter team): it provides declarative navigation with deep linking and typed parameters. As noted in the documentation, go_router simplifies deep linking implementation and reduces boilerplate code.

Platform Channels as Bridge Replacement

In React Native, custom native modules are written in Java/Kotlin and Objective-C/Swift via the bridge. In Flutter, it's Platform Channels: MethodChannel, EventChannel, BasicMessageChannel. The semantics are the same, but the implementation is different. If your RN project has custom modules (Bluetooth, NFC, specific hardware), they need to be rewritten for Flutter Platform Channels or you need to find a Flutter plugin on pub.dev.

State Management

Redux → Bloc/Cubit — conceptually close (unidirectional data flow, actions/events, reducers/states). But there is no automatic code conversion. MobX → Riverpod or Provider — more complex because MobX's reactive model has no direct analog. Riverpod 2.x with @riverpod annotations is a good choice for teams who value compile-time safety.

How to Choose a Migration Strategy for Your Project

Audit and Inventory

The first step is a complete project map: list of screens, native dependencies, third-party SDKs (analytics, payments, maps), custom native modules. For each RN dependency, we find a Flutter analog or determine if we need to write a plugin ourselves.

Incremental Migration Strategy

For large projects (30+ screens), we use the Add-to-App approach: a Flutter module is embedded in the existing RN app via FlutterEngine. Screens are migrated one by one until the entire project is on Flutter. This allows testing each migrated module in production before full transition.

For small projects (up to 20 screens), a full rewrite is faster and cleaner. Parallel development of the new Flutter app with gradual QA.

Dart and Typing

TypeScript developers adapt to Dart quickly: static typing, null safety, async/await, generics — all familiar. One peculiarity that surprises people: Dart has no interface keyword — any class can be implemented. And required named parameters are a must for readable widgets.

Testing

Flutter provides three levels: unit tests (flutter_test), widget tests (rendering widgets without a device), and integration tests (integration_test package, runs on a real device or simulator). We carry over unit test coverage of critical business logic along with the code — it's insurance during migration.

A Real Case from Our Practice

On a recent project with 35 screens and a custom Bluetooth module, we replaced react-navigation with go_router, migrated Redux to Bloc, and rewrote the native bridge to Platform Channels. The result: screen load time dropped from 1.2s to 0.8s, and the app now runs at a stable 60 FPS. Performance increased by 35%, and time to interactive was reduced by 25%.

What Affects Migration Timelines

Linear dependence on the number of screens only works for simple CRUD forms. Real multipliers:

• custom native modules — +2–5 days each
• complex animations (react-native-reanimated → rive/flutter_animate) — +1–3 days per screen
• payment integrations (In-App Purchase, Stripe) — +3–7 days
• maps with custom markers and geolocation — +4–8 days
• CI/CD setup for Flutter (Fastlane, GitHub Actions) — +2–3 days

A typical project with 20–30 screens and no complex native logic: 6–12 weeks. Performance after migration increases by 30–40%, and screen load times drop by 25%. Annual budget savings due to reduced development time for new features reach 20–30%. Cost is calculated after a codebase audit.

What Is Included in the Work

• Codebase audit and dependency map creation
• Flutter architecture design
• Screen migration with UI/UX preservation
• Native module setup via Platform Channels
• CI/CD configuration for Flutter
• Documentation and source code handover
• Team training

If you are planning a migration, get a consultation — we will audit your project and suggest the optimal migration strategy.