React Native · Swift/Kotlin · Ionic · Xamarin → Flutter
The only Spanish agency in Google's official Flutter directory. We migrate your existing app without losing functionality, no big-bang, with a process proven across more than 100 projects.
Why migrate
iOS and Android from the same repository. A sprint of changes affects both platforms simultaneously. The team shrinks and speed increases.
Flutter compiles to machine code — no JS bridge, no WebView. The result is indistinguishable from a native app in Swift or Kotlin.
Flutter renders with its own graphics engine (Impeller). Animations are smooth at 60/120fps and the design is identical on iOS and Android.
Over 30,000 packages on pub.dev. Google and the community maintain plugins for almost any integration: BLE, NFC, maps, payments, camera.
Hot reload in seconds, no recompilation. Iteration cycles are 40% faster compared to separate native development.
Flutter is the world's #1 cross-platform technology by downloads. Google uses it in their own products. The risk of technology abandonment is minimal.
Decisión
Migrar cuesta — y mantener la app actual también. Estos son los cuatro escenarios en los que, por nuestra experiencia con +100 apps en producción, una migración a Flutter devuelve la inversión en menos de 12 meses.
Cada feature se construye dos veces. Si el roadmap crece y el equipo no puede escalar al mismo ritmo, Flutter elimina esa duplicación sin renunciar al look nativo.
Umbral → Coste mensual de mantenimiento > 1 FTE dedicado a paridad
El bridge JS ↔ nativo, cambios bruscos en la New Architecture y librerías abandonadas os están forzando patches constantes. Flutter tiene motor propio (Impeller) y ecosistema maduro.
Umbral → Más de 3 bugs de plataforma al trimestre sin solución upstream
Flutter es hoy cross-platform real (móvil + web + desktop + embedded). Migrar ahora evita construir cada canal desde cero con un stack distinto.
Umbral → Roadmap a 12 meses incluye > 1 canal nuevo
Si Swift/Kotlin/Xamarin dependen de 1-2 personas y no encontráis relevo senior en el mercado, Flutter reduce el riesgo de bus factor a la mitad: el pool de talento Dart es mayor y más joven.
Umbral → Riesgo de bus factor en un ingeniero concreto
Coste y plazos
Rangos honestos derivados de más de 20 migraciones reales. La auditoría técnica inicial (4.000–8.000 €) define el presupuesto exacto antes de firmar nada.
| Complejidad | Señales | Plazo | Inversión |
|---|---|---|---|
| Baja | 5–10 pantallas, pocas integraciones nativas, sin SDKs propietarios | 3–4 meses | 40.000–60.000 € |
| Media | 10–25 pantallas, login federado, pagos, push, analítica, CI/CD | 4–6 meses | 60.000–100.000 € |
| Alta | 25+ pantallas, BLE/NFC, mapas, offline-first, SDKs bancarios/sanitarios | 6–12 meses | 100.000–150.000 € |
Incluye auditoría, arquitectura, implementación, QA, release paralelo y transferencia de conocimiento al equipo interno. No incluye licencias de terceros ni servicios cloud.
Starting point
Each technology has its particularities. Here's what you can expect depending on where you're coming from.
React Native
“The JS bridge limits performance. Outdated libraries. Upgrading RN every version is a nightmare.”
Swift / Kotlin nativo
“Two repositories, two teams, twice the bugs. Every feature developed twice, never exactly the same.”
Ionic / Capacitor
“WebView performance that hurts the experience. Animations that don't hit 60fps. Web that doesn't feel native.”
Xamarin / .NET MAUI
“Xamarin is end-of-life. MAUI has maturity limitations. Microsoft's mobile ecosystem is shrinking.”
Process
We analyse the current code: technical debt, critical dependencies, existing tests, backend APIs and coupling to the native platform. We deliver a risk report and a migration plan.
We design the Flutter project architecture: folder structure, state management (Riverpod/BLoC), navigation, dependency injection and team conventions.
We migrate module by module, prioritising by impact and risk. Each sprint delivers verified functionality. No big-bang — there's always a working version.
Manual testing on real devices (iOS and Android), automated integration tests and performance validation with Dart DevTools. No silent regressions.
Publication on the App Store and Google Play, architecture documentation, training sessions for the client's team and post-launch support.
If your native app works well, the team is senior in Swift or Kotlin, and you're not under pressure to cut costs or expand to new platforms, migration may not be the best investment. Also if the project is nearing end of life or the maintenance budget is very limited. We'll tell you honestly in the initial audit.
Frequently asked questions
It depends on the complexity of the original app. An app with 5–10 main screens can be migrated in 3–4 months. Complex apps with deep native platform integrations may require 6–12 months. The initial audit gives us a precise timeline.
Yes, and it's the recommended approach. The migration runs in parallel. The client's team can keep fixing critical bugs in the original app while we build the Flutter version. We coordinate releases to minimise divergence.
Backend APIs don't change — that's the advantage. Flutter consumes the same REST, GraphQL or WebSocket APIs as the original app. Only the presentation layer and UI logic are rewritten.
Not to get started. We handle the full migration. But we recommend the client's team gets involved from the beginning to absorb the knowledge. Dart is very similar to TypeScript and Kotlin — the learning curve is short for experienced developers.
Unit tests for business logic are ported if they are well separated from the UI. UI tests (snapshot, instrumentation) are rewritten in Flutter's testing framework. If coverage is low, we take the opportunity to build it from scratch.
Migrations start at €40,000 for medium-complexity apps. The typical range is €60,000–€150,000. The key factors are the complexity of the original app and the volume of native integrations. The initial technical audit (usually €4,000–€8,000) defines the exact budget.
Start with the technical audit. In 1–2 weeks you'll have a realistic migration plan with timelines and budget.
