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Flutter Apps With One Codebase, Every Screen

Build branded, animation-rich apps for iOS and Android from one Dart codebase, with web and desktop builds available when you need them.

Book a free consultationWhat we build
  1. MaterialApp()
  2. Scaffold()
  3. AppBar()
  4. ListView.builder()
  5. OrderTile()
  6. FloatingActionButton()

Flutter development for products with a strong visual identity

Flutter is Google's open-source UI toolkit for building apps from a single Dart codebase. Instead of wrapping platform widgets, it draws every pixel itself, so a custom design looks the same on an iPhone, a budget Android phone, a browser or a desktop window. Hot reload keeps design changes quick, and compiled Dart code delivers smooth animation on modest hardware.

Flutter is a good choice for startups that need iOS and Android at launch, for brands with a distinctive custom UI, and for teams that later want web or desktop builds from the same code. React Native can be the better option if your developers already work in React and want to share code with a web app. Fully native development in Swift and Kotlin still wins for very hardware-heavy apps, advanced camera processing or products that only ever target one platform.

Nexzem builds Flutter apps with clear state management, typed API layers and automated tests, so the codebase stays readable as features pile up. We often pair Flutter with Firebase or a Node.js backend, handle store submissions for both platforms, and hand over everything with documentation, CI pipelines and a short walkthrough for your in-house developers.

Hot reload, felt

Change the seed colour, the title or the floating button and watch the widget tree rebuild in place, state intact.

What we build with Flutter

Flutter apps with pixel-consistent custom UI on iOS, Android, web and desktop from one Dart codebase.

  1. 01

    Cross-Platform Mobile Apps

    iOS and Android apps from one Dart codebase, with platform-specific touches such as navigation gestures and permission dialogs handled correctly on each system.

  2. 02

    Custom UI and Animation

    Branded interfaces, custom widgets, charts and motion design built to match your Figma files closely, without the limits of stock platform components.

  3. 03

    Flutter Web and Desktop

    Admin panels, kiosks and internal tools compiled for browsers, Windows or macOS from the same code that powers your mobile app.

  4. 04

    Firebase-Backed Apps

    Authentication, Firestore, cloud functions, push notifications and analytics wired up for fast MVPs that can later move to a custom backend.

  5. 05

    Platform Channel Integrations

    Kotlin and Swift code bridged into Flutter for payment SDKs, Bluetooth hardware, background services and other features without ready-made packages.

  6. 06

    Flutter MVP Builds

    Lean first versions for founders who need to test demand on both stores quickly, scoped tightly around the core user journey.

  7. 07

    App Rescue and Upgrades

    Audit and repair of unstable Flutter projects, null safety migration, package upgrades and refactoring of tangled state management into a clear pattern.

Why teams pick Nexzem for Flutter

The checks every engagement has to pass before we call it done.

.github/PULL_REQUEST_TEMPLATE.md5/5 checked

  • - [x] Consistent look everywhere

    Your design renders the same on every device, which matters for brands that care about visual detail.

  • - [x] Shorter path to both stores

    Shared code for UI and logic means iOS and Android launch together rather than months apart.

  • - [x] Room to expand platforms

    Web, Windows and macOS builds come from the same project when your roadmap needs them.

  • - [x] Smooth on modest phones

    Compiled Dart and careful widget design keep animations fluid even on entry-level Android devices.

  • - [x] Clean handover

    Documented architecture, tests and CI setup make it straightforward for your own developers to take over.

Flutter vs React Native: how to decide

Both frameworks produce high-quality apps for iOS and Android from one codebase, so the decision usually rests on team and product rather than raw capability. Flutter draws its own interface, giving pixel-identical results everywhere and excellent performance for custom animation and branded design. React Native renders platform components and fits teams that already work in JavaScript, TypeScript and React.

Consider existing skills, whether you have a web app to share code with, how custom the design is, and which native SDKs you need. Our Flutter vs React Native comparison covers these factors in depth. For a design-led consumer app, a kiosk or a product that must also run on desktop, Flutter is often the stronger choice.

Long-term maintenance matters too. Flutter upgrades are generally smooth because Google ships the framework and core plugins together, while React Native relies more on community libraries that must keep pace with each release. Either way, plan regular upgrades and choose well-maintained packages.

How we structure a Flutter codebase

We organize code by feature, each with presentation, application and data layers, and keep shared widgets, theming and networking in core packages. State management uses Riverpod or Bloc depending on team preference, data models are immutable classes generated with freezed and json_serializable, and navigation uses go_router with deep link support from day one.

Flavors separate development, staging and production builds with their own configuration and icons. Strict analysis rules run in CI, along with unit, widget and golden tests that catch visual regressions. Builds and store uploads run automatically through GitHub Actions or Codemagic, so releases are repeatable rather than dependent on one developer's laptop.

Performance work focuses on rebuilding as little of the widget tree as possible, using const constructors, lazy lists and image caching, and profiling with Flutter DevTools on mid-range Android devices. The Impeller renderer has largely removed the shader compilation stutter that early Flutter apps suffered from.

  • Feature-first folders with clear layer boundaries.
  • Repositories that hide API and local storage details from the UI.
  • Golden tests for key screens and components.
  • Platform channels isolated in small, well-tested plugins.
  • Localization files and accessibility checks from the first screen.

Cost drivers of a Flutter project

Flutter saves effort by sharing code across platforms, but several factors still drive scope. Understanding them early helps you plan a focused first release and budget realistically for what comes after it. Each one can move timelines by weeks, so decide them before design begins.

  • Number of targets: mobile only, or also web and desktop.
  • Design complexity, custom animation and branded components.
  • Native integrations such as payments, Bluetooth, camera and maps.
  • Backend choice: Firebase or Supabase versus a custom API.
  • Offline support and data synchronization rules.
  • Localization, accessibility and testing depth.
  • Store compliance, security reviews and post-launch support.
  • Analytics, crash reporting and release automation setup.

How Flutter projects run

$ git log --graph --oneline main..delivery

  1. 8a51982

    feat: product workshop

    We agree the core user journey, target platforms and backend choice, and confirm Flutter is the right fit.

  2. e6f4e90

    feat: design and prototype

    Figma designs and an interactive prototype so stakeholders can tap through flows before development.

  3. f018e30

    feat: build in sprints

    Dart development with widget and integration tests, plus test builds for iOS and Android each sprint.

  4. b87c61d

    feat: store launch

    App Store and Play Store listings, review submissions and release monitoring for both platforms.

  5. b662cf6

    merge: grow and maintain

    Feature updates, Flutter version upgrades and performance checks under a monthly support plan.

What teams build with Flutter

  • Fintech app with a custom design system

    A neobank builds a distinctive, animation-rich interface that looks identical on iOS and Android, with a shared component library, secure storage, biometric login and native modules for payment and KYC SDKs.

  • Self-service kiosk on Android tablets

    Restaurants and clinics run a Flutter kiosk app for ordering or check-in on mounted tablets, with locked-down kiosk mode, card and UPI payments, printer integration and remote updates managed centrally.

  • Internal desktop tool

    Operations staff use a Flutter desktop application on Windows and macOS for data entry and approvals, sharing most code with the field team's mobile app and talking to the same backend APIs.

  • Companion app for a Bluetooth device

    Owners pair a smart device over Bluetooth Low Energy, configure settings, view live readings and receive firmware updates, with platform channels handling the native Bluetooth details on each operating system.

  • White-label apps for several brands

    One Flutter codebase produces separate store apps for multiple franchise brands, each with its own colors, logos, features and backend configuration, so improvements reach every brand in a single release.

Where Flutter sits in your stack

The tools we pair it with, layer by layer. Select a layer to see what it is responsible for.

Technologies often used with Flutter

All 32 technologies

More in Mobile

Flutter development FAQs

Something else on your mind? Ask a consultant and get a reply within one business day.

Is Flutter the right choice for our app?

Flutter works well when you need iOS and Android together, want a custom branded UI, or plan web and desktop versions later. If your team already writes React, React Native may be easier to staff. If the app depends heavily on device hardware, native may be safer. We help you decide in the free consultation.

How much does a Flutter app cost?

Cost depends on screens, custom animation, backend complexity, integrations and the number of target platforms. Because UI and logic are shared, two platforms cost less than two native apps. You receive a fixed quote after a free consultation.

How long does a Flutter MVP take?

A tightly scoped MVP usually takes around 6-10 weeks including design and store submission. Larger apps with admin panels or complex integrations take longer, and we share a sprint plan with dates before work starts.

Can Flutter apps use native device features?

Yes. Most features have mature packages, and where they do not we write platform channels in Swift and Kotlin. Camera, maps, payments, Bluetooth and notifications are all routine.

Who owns the Flutter code and store accounts?

You do. The repositories, App Store and Play Console accounts, signing keys and designs stay in your name, and we sign an NDA on request.

Can one Flutter codebase power several white-label apps?

Yes. Using flavors, theming and configuration files, one codebase can build separate apps with their own names, icons, colors, features and API endpoints. Each brand gets its own store listing, while fixes and improvements are developed once and released to all of them.

How do you test Flutter interfaces?

We combine unit tests for logic, widget tests that render components in isolation, golden tests that compare screenshots to catch visual changes, and integration tests that run real flows on devices or emulators. These run in CI on every pull request.

We work with clients across the USA, UK, Australia, UAE, New Zealand and India.

Where we work

Tell us what you're building.

A solutions consultant replies within one business day with a recommended stack, a rough estimate and a suggested team.

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