React Native vs Flutter: which should your startup pick?

React Native vs Flutter is usually the first technical question a founder asks about a mobile app, and the honest answer is that both are good enough for a first version. Each lets one team ship an iOS app and an Android app from a single codebase, which is why we use them for most mobile MVPs. The difference is in the details: who you can hire, how the app should look, and whether you also need a website.

This guide compares the two on the points that matter for a startup's first app, using products we have shipped on each.

The short answer

If your team writes JavaScript, or a React web app is part of the plan, pick React Native. If you want one custom design that looks identical on every phone and you do not need to share code with a website, Flutter is an excellent choice. Everything below is the detail behind those two sentences.

Language and hiring

React Native apps are written in JavaScript or TypeScript, the language of the web. A developer who has built React websites can be productive in React Native quickly, and if your backend runs on Node.js, the app and the server can share types and validation rules.

Flutter apps are written in Dart. Dart is easy to pick up for anyone who knows TypeScript, Java, Kotlin or Swift, but fewer developers have used it before they join a Flutter project.

For the build itself this hardly matters, because the agency or freelancer you hire will already know their framework. It matters a year later, when you hire your first in-house engineer. Ask yourself who will maintain the app after launch, and look at which skills you can actually hire where you are.

Performance

For the apps most startups build first (lists, forms, maps, chat, payments), both are fast enough that users will not notice which one you chose.

Flutter compiles Dart to native machine code and draws every pixel itself, so animations are smooth and behave the same on every phone. React Native runs your JavaScript and drives the platform's real components. Its New Architecture, the default in current versions, removed the old bridge between JavaScript and native code that used to cause slowdowns in busy screens.

Where the difference can show is in heavy animation, long scrolling feeds of images, real-time graphics and heavy processing on the phone. Even there, how carefully the app is written matters more than the framework. Neither can make up for a slow API or images that were never resized. On speed alone, React Native vs Flutter is close to a draw for a first version.

UI and design

Flutter draws its own widgets, so a screen looks the same on iOS and Android down to the pixel. That suits a product with a strong, custom brand. It ships with Material and Cupertino widget sets, but they are careful copies of each platform's style rather than the real thing.

React Native renders the platform's own components. Text fields, switches and scrolling feel native by default, because they are. Custom designs are entirely possible, but some details differ between iOS and Android and need checking on both.

For a first version, the design itself matters far more than the toolkit. Every screen should be designed for a phone and tested on real devices before launch, whichever you pick.

Packages and integrations

Both have mature packages for what MVPs usually need: maps, payments, push notifications, the camera, and sign-in with Apple and Google. React Native uses npm and, very often, Expo, which handles builds, store submission and over-the-air updates. Flutter uses pub.dev and has strong first-party support for Firebase.

Before you choose, list the three or four integrations your product cannot live without: a payment provider, a mapping service, a piece of hardware. If one of them only has an official package for one framework, that can settle the question.

Two examples from our work:

• DocRadar is a Flutter app for iOS and Android. It uses Google Maps geolocation to show doctors nearby and Stripe for in-app payments, on a Node.js backend.
• Swipe & Shop is a React Native app on Firebase, with swipe gestures to like, skip or add to cart and a personalised product feed.

Web reuse: the question founders forget

Many MVPs need a mobile app and a website, or at least a web admin panel. This is where React Native has a real advantage. A React web app and a React Native app share a language, most of their libraries, and often the code that talks to the API and enforces business rules.

VitalSync, a fitness tracker with an AI coach, uses React on the web and React Native on the phone, both on a Node.js backend. For Rehnaa we built the web version of an existing Expo app, on the same API the app already used, with the same screens for tenants and landlords.

Flutter can also build for the web, and it works well for app-like tools behind a login. Its own web FAQ says it is not the right fit for static, text-heavy pages such as blog articles. So with Flutter, your marketing site and landing pages will usually be a separate web project in any case.

When to skip both and go native

Cross-platform is the right default for an MVP, but not always. Consider a native app (Swift for iOS, Kotlin for Android) when:

• The product only needs one platform, and leans hard on that platform's features: background work, the file system, home-screen widgets, Bluetooth hardware, augmented reality or a watch app.
• The core feature is something the cross-platform tools reach only through native code anyway.

Headroom, our own storage cleaner, is built in Kotlin with Jetpack Compose. It runs on Android only, scans files on the device and compares duplicates byte by byte. A cross-platform layer would have bought us very little there.

Going native for both platforms means two codebases, two sets of bugs and twice the testing. If only one feature needs native code, both frameworks let you write that one piece natively and keep the rest shared.

React Native vs Flutter: how we decide

We make this choice in the blueprint week, before any design starts, and write the reason into the plan. The questions are short:

1. Do you need a web app as well? If yes, React Native, so the two can share code.
2. Is the design custom and brand-heavy, with no shared web code? Flutter is a strong fit.
3. Does a key integration only support one framework well? Use that one.
4. Who will maintain it after launch? Match the skills you can hire.
5. Is it one platform with deep device access? Go native.

Our own Zakat Calculator and Lead Diary are React Native with Expo; DocRadar is Flutter. Each was the right answer for that product. Neither choice will make or break your MVP. Scope will, which is why we wrote a separate guide on how to scope an MVP.

If you are weighing the two for your own product, have a look at our mobile app development process, or tell us what the app needs to do and we will recommend one, with the reason in writing.