React Native vs Flutter vs Capacitor: choosing a cross-platform framework for your startup

What is the difference between React Native and Flutter?

The difference is who draws the interface. React Native asks the operating system for its components; Flutter brings its own. Almost everything else follows from that, from the language you write in to how closely the app feels like the rest of the phone.

React Native: platform components, driven by JavaScript

You write JavaScript or TypeScript with React, and, as the React Native docs explain, the framework creates the corresponding Android and iOS views at runtime. Since version 0.76 the New Architecture is on by default, and the React Native team recommends starting new apps with a framework such as Expo, which brings routing, universal libraries and plugins that modify native code for you.

Flutter: its own rendering engine, in Dart

Flutter bypasses the system UI libraries in favour of its own widgets, and release builds compile Dart straight to machine code. Since Flutter 3.27 the Impeller engine is the default on iOS and on Android API 29 and above, according to the Flutter documentation. The upshot is a pixel-identical interface on every device, with plenty of room for bespoke visuals.

That is close to a dead heat, and across all respondents the numbers barely move (9.4% and 8.4%). Hiring is feasible either way, so popularity will not make the call for you. The biggest pool of all is web developers, which is where the third option comes in.

When does Capacitor make more sense than React Native or Flutter?

When your product already runs in the browser or your team is made of web developers. The Capacitor docs describe it as a cross-platform native runtime that can be dropped into any modern JavaScript project, with full access to native SDKs when you need them.

WebView

The component a native app uses to display web content inside itself. Capacitor runs your web app in one and connects it to device features through plugins: camera, notifications, in-app purchases, files.

The limit is perception. An app that feels like a website in a wrapper disappoints users and invites trouble in review, because Apple's guidelines expect an app to go beyond a repackaged website. With Capacitor you still design for the phone: navigation, gestures and offline states built for a handset, not a browser tab.

Which one performs better?

For most startup apps (forms, lists, dashboards, payments, chat) raw framework performance is not what decides success. Code quality, the number of network calls and how you handle images and long lists matter more. Differences show up at the edges: elaborate animation and custom graphics favour Flutter, while an interface that should feel exactly like the operating system is React Native's home ground.

If the product depends on real-time graphics, AR or audio processing, look hard at native development, or at Kotlin Multiplatform, which shares code across Android and iOS while keeping the advantages of native development. Those choices move the budget, as we explain in how much it costs to build an app.

How should a startup choose between them?

1. Who will maintain this in two years? A React team points to React Native or Capacitor; a fresh team that wants a highly custom UI points to Flutter.
2. Do you already have a web app? If so, Capacitor lets you reuse most of it; React Native lets you reuse logic and skills, not screens.
3. How much should it feel like a system app? The more it matters, the stronger the case for React Native or native.
4. Which device features do you actually need? List them and check that maintained plugins exist for each one on the framework you are considering.
5. Is the web a real channel? If customers also use the product on laptops, a shared web codebase is worth a lot.

A useful test before you commit: build the riskiest screen of your app, the one with the most device features or the most complex interaction, as a two-week spike in the framework you favour. You will learn more about plugin quality, tooling and your team's speed from that than from any comparison table, including ours.

Whichever you pick, the next step is the same: developer accounts, store listings and review, all covered in how to publish an app on the App Store. For the bigger picture, start with how to build a mobile app.