Flutter Migration — From Native iOS, Android or React Native
Migration makes sense the moment maintaining two native codebases costs more than building one in Flutter. I plan and run that migration so functionality isn't lost in the process.
What migration covers
- Migrating native iOS (Swift/Objective-C) or Android (Java/Kotlin) apps to Flutter
- UI/UX modernisation alongside the technical migration
- Parity testing against the existing native app feature-by-feature
- A phased migration strategy rather than a single high-risk rewrite
When migration makes sense
- You're maintaining two codebases and two teams for what is functionally one product
- The maintenance overhead of staying native now exceeds the cost of migrating
What breaks and how I handle it
- Platform-specific APIs — wrapped behind platform channels so the rest of the app stays platform-agnostic
- Push notifications, deep links, and in-app purchases — re-implemented and tested against the native behaviour they replace
- Keychain and Keystore — bridged carefully since this is where silent data loss happens if migration is rushed
Proof
Flutter Migration — Legacy iOS/Android to Flutter
12+ year old native app fully modernised to Flutter without losing functionality or users.
Read the case study →Frequently asked questions
How long does a Flutter migration take for a mature native app?+
For a multi-year native app, expect 4 to 9 months depending on feature surface area and how much of the backend also needs to change. A 12-year-old app migrated under my lead at IronOne took roughly 18 months end-to-end, including a full UI/UX redesign.
Will we lose any native functionality after migrating to Flutter?+
Not if the migration is planned properly. Every native capability — push notifications, deep links, payments, platform-specific storage — gets an explicit parity check before launch.
Can we migrate incrementally or does it have to be a full rewrite?+
Incremental migration is possible for some app shapes using a hybrid native/Flutter shell, but in practice most production migrations are cleaner as a phased full rewrite run alongside the existing app, cut over once parity is reached.