Cross-Platform & Multi-Platform App Development: React Native vs Flutter

Updated September 2026 · Written and maintained by the Progression Agency strategy team

Cross-platform app development means building one app that runs on both iPhone and Android from a single codebase. That single codebase is what a cross platform application development company sells: shared business logic and most screens, with native code written only for the few features that need it. It is now the default choice for most business apps, and it is the approach Progression Agency recommends most often. This page explains how cross-platform development works, how it compares with native and hybrid apps, when React Native or Flutter is the better framework, what it costs, and when native is still worth it.

What is cross-platform app development?

Cross-platform app development is building a mobile app from one shared codebase that compiles or renders natively on both iOS and Android. Frameworks such as React Native and Flutter let one team write the app once and publish it to both the App Store and Google Play. React Native cross platform app development is covered in detail on our React Native app development page.

Unlike older hybrid approaches that displayed a website inside an app shell, modern cross-platform frameworks render real native components (React Native) or draw every pixel with a high-performance engine (Flutter). For most business apps users cannot tell the difference from a native build. Cross platform app development, mobile especially, appeals to founders because one team can cover two stores. Mobile cross platform app development differs from sharing code between a website and an app, although some tools do both. Cross platform development for mobile also keeps features in step, since both versions ship from one backlog.

Cross-platform vs native vs hybrid app development

Native apps are built separately for each platform in Swift and Kotlin and offer the best performance and hardware access at the highest cost. Cross-platform apps share one codebase with near-native performance at lower cost. Hybrid apps wrap web code in a native shell and are the cheapest but the least app-like. The point of comparing cross platform app development vs native is one practical question: does a second codebase buy anything the user would actually notice? In native vs cross platform mobile development, the deciding question is often hiring: whether you can staff two specialist teams for years, not just for launch.

What is the difference between cross-platform and hybrid?

A hybrid app is a web application running inside a native wrapper, typically using Ionic with Capacitor or Cordova. A cross-platform app uses a framework that produces native UI or its own compiled rendering. Cross-platform apps generally feel and perform closer to native.

React Native vs Flutter: which should you choose?

Choose React Native if your team knows JavaScript or TypeScript and React, if you want to share logic with a React web app, or if you rely on the large npm ecosystem. Choose Flutter if you want a highly branded interface that looks identical on both platforms, smooth custom animation, or a single toolkit that also targets web and desktop.

What about Kotlin Multiplatform?

Kotlin Multiplatform shares business logic between platforms while keeping each platform’s native interface, and Compose Multiplatform extends sharing to UI. It suits teams with strong Android and Kotlin skills who want native UI with shared logic. See the Kotlin Multiplatform documentation.

Pros and cons of cross-platform development

• Pro: one codebase for iOS and Android reduces build and maintenance effort.
• Pro: simultaneous launch on both stores with feature parity.
• Pro: one team to hire and manage.
• Pro: faster iteration: fixes and features ship to both platforms together.
• Con: some platform-specific features need native modules.
• Con: framework and dependency upgrades must be kept current.
• Con: app bundles can be larger than an equivalent native app.

When should you build native instead?

Build natively when performance-intensive graphics, augmented reality, complex background processing or brand-new OS features are the core of the product, or when you need only one platform. For most other apps, cross-platform is the better investment.

How much does cross-platform app development cost?

As a price band, a cross-platform MVP commonly costs roughly $40,000-$90,000 and a full-featured business app roughly $90,000-$200,000. Compared with two separate native builds, cross-platform commonly saves a substantial share of the build and maintenance budget because most code is written once.

See the full app development cost breakdown for cost by app type and feature.

Our cross-platform app development services: what a cross platform app development company ships

Progression Agency builds cross-platform apps in React Native and Flutter, with the backend, admin tools, store launch and user acquisition handled by the same team. We recommend the framework after discovery, based on your product and team rather than a house preference. Learn more on our app development company page. When you evaluate a cross platform app development company, ask to see apps it has released on both stores and how it handled the differences between the platforms. A cross platform development service should also state what happens after launch, since framework upgrades and new OS releases keep arriving. Cross platform mobile application development services priced per screen can hide native module work, so ask how that is counted. A cross platform development company that cannot name which features will need native code has not read your brief closely.

• Framework selection and technical architecture
• UX and UI design adapted to iOS and Android conventions
• React Native and Flutter development
• Native modules for camera, payments, health data, Bluetooth and more
• Backend, APIs and admin panel
• App Store and Google Play submission
• Maintenance, OS updates and framework upgrades
• Launch marketing and app store optimization

Cross platform mobile app development services and multiplatform mobile app development

Teams that search for mobile app development cross platform are usually deciding between one shared codebase and two separate native builds. Our cross platform mobile app development services start with that decision: which screens can be shared, which device features need native code, and what the store review process will expect. Multiplatform mobile app development also covers sharing business logic while keeping native interfaces, which suits products that need the platform look on each side. Either route ends with one backlog, one release plan and one team accountable for both app stores.

Cross platform mobile development services: what to put in the brief

List device features first. Camera, Bluetooth, background location, payments and health data decide how much of the app shared code can actually cover, so they matter more than the screen count. Then describe user roles, offline needs and any backend the app must talk to.

State the oldest iOS and Android versions you need to support, because a framework’s current release may no longer reach them. Say who will hold the store developer accounts, and ask for them in your name. If one feature worries you, ask for a small prototype of that feature on real phones before the full estimate.

Multi-platform app development company

A multi-platform app development company builds one product for iPhone, Android and often the web from shared code. React Native application development and Flutter are the two main routes; we choose between them per project. Multiplatform development can also include desktop, which changes the framework shortlist, so state every target before choosing. Multi platform development usually saves the most on business logic and the least on screens that need different behavior for each device.

Mobile app development with React

Mobile app development with React means React Native: the same component model and TypeScript skills used for React web apps, rendering real native interface elements on iOS and Android.

What multi platform mobile application development involves beyond the code

A shared codebase removes duplicate feature work, but the surrounding jobs stay double. Two stores have their own review rules, signing setups, privacy declarations and screenshot sets, and a rejection on one side can hold up a release you planned for both.

Push notifications, in-app purchases and deep links each work differently on iOS and Android, so each gets tested twice even when the code is shared. Decide up front whether both versions always ship together or whether one may go ahead when the other is stuck in review, because that choice affects your server code and your release notes.

Other cross-platform frameworks worth knowing

Beyond React Native and Flutter, several frameworks target both platforms. Each suits a specific kind of team. Cross platform mobile development platforms differ most in language, so favor one your team can already hire for. A cross platform mobile development framework also needs an active maintainer, which means checking its release history and who funds it before committing. Flutter cross platform development gets its own note below, given how often it reaches the shortlist.

.NET MAUI

Microsoft’s framework for building native apps in C# and .NET, a natural fit for organizations already standardized on the Microsoft stack. Documentation.

Ionic with Capacitor

Builds apps from web technologies and packages them natively; efficient for teams with strong web skills and content-led apps.

Compose Multiplatform

JetBrains’ extension of Jetpack Compose that shares UI across Android, iOS, desktop and web alongside Kotlin Multiplatform logic.

NativeScript

Gives JavaScript and TypeScript direct access to native platform APIs; used by teams wanting native API access without writing Swift or Kotlin.

Flutter cross platform app development

Flutter is written in Dart and draws its own interface instead of borrowing each platform’s buttons, so a screen looks the same on an iPhone and on an Android phone. That suits products with a strong visual identity or animation-heavy flows. The tradeoff is a smaller pool of Dart developers than JavaScript has. Among cross platform app development frameworks it pairs well with Firebase, one of several cross platform app development tools that cover analytics, crash reporting and authentication. A cross platform app development company in USA should say plainly when a project fits Flutter and when it does not.

Testing cross-platform apps

One codebase still has to be tested on both platforms and across device sizes and OS versions. We combine automated unit and integration tests with device-farm testing and manual QA on real iPhones and Android phones.

Automated testing

Unit tests for business logic, component tests for the interface and end-to-end tests for key journeys run on every change.

Real-device testing

We test on a matrix of recent and older iPhones and popular Android devices, because performance and layout issues often appear only on specific hardware.

Beta distribution

TestFlight for iOS and Google Play testing tracks for Android put builds in real users’ hands before release.

Framework upgrades

React Native and Flutter release regularly. Maintenance plans include scheduled framework upgrades so the app never falls far behind.

Choosing a multi platform app development company

A multi platform app development company should be able to argue for native as well as against it. Cross-platform mobile app development is the right call for most business apps; native is right for camera-heavy, hardware-heavy or performance-critical products. We build both, and the recommendation comes in writing before the estimate. For app-like reach without the stores, see progressive web app development.

Frequently asked questions