Flutter app development services

Flutter app development with native depth

Flutter draws every pixel of the interface itself, so one Dart codebase looks identical on iOS and Android. Comtau structures Flutter apps so they stay easy to change. We write the Swift and Kotlin for features Flutter can't reach on its own.

Discuss your Flutter app Our Flutter architecture

Illustrative example - not a client project

Fit

When Flutter is the right framework

Flutter is a strong default for many apps, but not for all of them. If you are still comparing options, start with our cross-platform app development comparison.

Good fit

  • A custom, branded interface that should look and move the same on every phone.
  • Motion and visual polish: Flutter's rendering engine handles complex animation smoothly.
  • One Dart team responsible for both apps and their release rhythm.
  • Internal tools beyond mobile: the same code can target web and desktop when that helps.

Think twice

  • Apps that must look strictly like each platform's system apps in every detail.
  • Products built around brand-new OS capabilities on launch day.
  • Teams with deep React expertise, where React Native is the more natural fit.

Architecture

How we structure Flutter apps

Flutter makes it easy to put everything in widgets. That works for a prototype and becomes expensive by the third release. If you are comparing a Flutter app development company, ask how it separates concerns. Ours does it from the first feature.

  1. Presentation

    Small, composable widgets that render state and forward user intent. They hold no business logic, so they are cheap to test with widget and golden tests.

  2. State

    Bloc/Cubit or Riverpod, chosen per project and used consistently. A tap rebuilds only the widgets that depend on what changed.

  3. Domain

    Plain Dart models and use cases, independent of Flutter. They are fast to unit-test and reusable if a web or desktop target is added.

  4. Data

    Repositories over the API client and local storage, with offline caching and a single place to handle errors and retries.

  5. Platform

    Plugins and our own platform channels for native features, wrapped behind Dart interfaces so the rest of the app never touches them directly.

Presentation + statein practice

Native features

Reaching iOS and Android from Dart

Payments, Bluetooth devices, background location, widgets or an SDK that only ships for iOS and Android: Flutter reaches them through a thin native layer.

  • Plugins first, after checking maintenance, licences and platform coverage.
  • Platform channels to our own Swift and Kotlin code when no good plugin exists.
  • FFI for native libraries where performance matters.
  1. Your Flutter appWidgets, state and domain logic in Dart
  2. Flutter engineRenders the UI with Impeller on both platforms
  3. Platform channel · FFITyped messages between Dart and native code
  4. Native moduleSwift on iOS, Kotlin on Android, e.g. a Bluetooth sensor

Existing apps

Inherited a Flutter app, or moving to one?

Taking over a Flutter codebase

  • Flutter, Dart and package versions against current releases
  • Plugins that are abandoned or block upgrades
  • State management consistency and test coverage
  • Build, signing and store account access

The result is a prioritized list: what to stabilize now, what to upgrade, and what can wait. See maintenance & modernization.

Moving a native app to Flutter

  • Add Flutter to the existing app, one feature at a time
  • Start with screens that change most often
  • Keep native code where it already works well
  • Retire the old screens once the Flutter versions are proven

No feature freeze, and no single high-risk release.

What we deliver

Flutter app development services

Flutter mobile app development from a first release to an inherited codebase that needs a firm hand.

  • New Flutter apps

    • Architecture set up before features
    • iOS and Android from one codebase
    • Offline data and sync

  • UI system

    • Design tokens and a widget library
    • Theming and dark mode
    • Accessibility: semantics, text scaling

  • Native integrations

    • Payments, maps, Bluetooth, camera
    • Platform channels in Swift and Kotlin
    • Plugin audits and forks when needed

  • Testing

    • Unit and widget tests
    • Golden (screenshot) tests for UI
    • Integration tests on real devices

  • Flavors & CI

    • Dev, staging and production flavors
    • Signed builds for both stores
    • Beta builds on every merge

  • Upgrades

    • Flutter and Dart version upgrades
    • Package updates and replacements
    • New OS versions checked in beta

Questions

Frequently asked questions

Is Flutter owned by Google, and is it still a safe choice?

Flutter is an open-source framework created and maintained by Google, with a large outside contributor and package community. Google uses it in its own products, and many well-known apps run on it. As with any framework, the real risk is in the codebase rather than the brand: pinned dependencies, unmaintained plugins and skipped upgrades. That is why upgrades are part of our maintenance plans.

What language does Flutter use?

Dart, a typed language from Google that compiles ahead of time to native ARM code for release builds. Developers who know Kotlin, Swift, TypeScript or C# usually become productive in it quickly. Native features are still written in Swift and Kotlin when the app needs them.

How much does it cost to develop a Flutter app?

A Flutter app usually costs less than two separate native apps with the same scope, because interface, logic and most tests are shared. The main cost drivers are the same as for any app: journeys, offline needs, integrations and the backend. Native integrations add to that, since each one needs Swift and Kotlin code. We estimate after discovery against a written scope; see mobile app development cost drivers.

Can a Flutter app use native iOS and Android features?

Yes. Most common features already have maintained plugins. For anything else, Flutter talks to Swift and Kotlin code through platform channels or calls native libraries directly through FFI. We write and test those bridges as part of the project, and we check third-party plugins for maintenance and quality before relying on them.

Can Flutter also run on web and desktop?

Yes. Flutter supports web, Windows, macOS and Linux from the same codebase. It works well for internal tools and app-like experiences behind a sign-in. For public, content-heavy websites that rely on search traffic, a conventional web stack is usually the better choice. We'll say which applies to your case.

Can you add Flutter to an existing native app?

Yes. Flutter's add-to-app support lets new screens or whole features be written in Flutter inside an existing iOS or Android app. Teams can migrate gradually, starting with the parts that change most, instead of stopping feature work for a rewrite.

All mobile app development services

Building with Flutter?

Whether it's a new app or a codebase you've inherited, tell us where it stands. We'll suggest the next sensible step.

What happens next

  1. Tell us who will use the app and what it has to do.
  2. We suggest a first release and the approach that fits it.
  3. You get an estimate tied to a written first-release scope.
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