How Flutter and React Native differ in language, rendering, performance, hiring, Arabic support and security, and when we would pick each.
Neither is better in general. Choose React Native if your team already works in JavaScript or TypeScript and React, if you want the interface built from each platform's own controls, or if you share logic with a web product. Choose Flutter if you want one tightly controlled, custom interface that looks the same on every device and you are happy to adopt Dart. For most business apps either will do the job, and the deciding factors are the team, the design and long-term maintenance, not benchmark charts.
Both are mature, both ship to the App Store and Google Play from one codebase, and both change quickly. Where a detail may have moved on, we say so: check the current documentation before you commit.
Language and ecosystem
**React Native** uses JavaScript or TypeScript with React. If your web developers already write React, their skills transfer, and a mobile app can share types, validation rules and API clients with the web product. The npm ecosystem is huge, but quality varies and many packages assume a browser.
**Flutter** uses Dart, a typed language from Google. Developers who know Java, C#, Kotlin or Swift usually become productive quickly. The package ecosystem on pub.dev is smaller, but the core widgets are first-party and consistent.
How each one draws the interface
This is the most important technical difference, and it explains most of the others.
React Native turns React components into the platform's real native views, so a button is a genuine iOS or Android button. New system looks and behaviours mostly arrive with the operating system. The price is that the two platforms behave slightly differently, and you test both.
Flutter draws every pixel itself with its own rendering engine and does not use the platform's controls. The result is an interface that is identical on both platforms, with full control over animation and custom design. The price is that the native look is reproduced by Flutter's own widget sets, so when a platform changes its design language, your app follows when Flutter catches up. Text input and accessibility are also implemented by the framework, so test them with real screen readers.
Performance
Both are fast enough for the large majority of business apps: lists, forms, maps, payments and dashboards. Flutter compiles Dart ahead of time to machine code in release builds and controls every frame, which gives consistent animation. React Native runs JavaScript on the Hermes engine, and its newer architecture replaced the old asynchronous bridge, removing a long-standing source of overhead.
In practice, slowness in either framework usually comes from the app: long lists that are not virtualised, heavy work on the main thread, oversized images. Games, heavy real-time graphics and advanced camera or augmented-reality pipelines are where we would look at fully native code or a game engine instead.
Native integration and platform features
Both can call native code: React Native through native modules, Flutter through platform channels and FFI. Common needs such as camera, location, push notifications, biometrics and in-app purchases have well-maintained packages in both. Unusual needs, such as a brand-new operating system feature or a bank's own SDK, may need a wrapper written in Swift or Kotlin. Whichever framework you choose, keep someone on the project who can read native code.
Developers, tooling and testing
**Hiring.** The JavaScript and React pool is larger, so a team fluent in React is productive in React Native sooner. Dart developers are fewer, though Dart is quick to learn. Check your local market rather than trusting global claims.
**Tooling.** Both have hot reload. Flutter ships one integrated toolkit: SDK, formatter, analyser and DevTools. Most new React Native projects start with Expo, which handles much of the native configuration and the build process.
**Testing.** Flutter includes unit, widget and integration testing, plus golden-image tests that catch visual regressions. React Native teams typically use Jest and React Native Testing Library for components and a tool such as Detox or Maestro for end-to-end flows. In both, test on real devices, on both platforms and in both languages.
Updates and long-term maintenance
Both frameworks release often, and neither upgrade is free. In React Native the effort depends on how many native libraries you rely on, because each must support the new version. In Flutter, third-party packages can lag behind a new release. Keep dependencies few and well maintained in either case.
React Native can ship JavaScript-only fixes without a store review through update services such as Expo's, within each store's rules. Flutter has no first-party equivalent, though third-party services exist. Both are backed by large companies and active open-source communities, and both carry some risk that priorities change, so keep business logic separate from the interface layer to make a future move cheaper.
Right-to-left and Arabic support
Both support right-to-left layouts and Arabic well. Flutter's Directionality widget and localisation delegates flip the layout when the locale changes, and start/end variants of padding and alignment keep layouts direction-aware. React Native follows the system direction through I18nManager and supports start/end style properties, but forcing a direction at runtime typically needs the app to reload, which matters if users can switch language inside the app.
In either framework, test mixed text (Arabic with Latin names and numbers), mirrored icons, text-field cursors and selection, Arabic fonts and line height, and date and number formats. See [designing bilingual products](/blog/designing-bilingual-rtl-products) for the wider checklist.
Security considerations
Neither framework makes an app secure or insecure on its own. What matters is the same in both: keep secrets off the device, because anything bundled in an app can be extracted; store tokens in the platform's Keychain or Keystore through a maintained package; use certificate pinning where the risk justifies it; and keep dependencies reviewed and scanned.
A JavaScript bundle, even compiled to Hermes bytecode, can be inspected. Dart release builds compile to native code and can be obfuscated, which raises the effort for someone reverse engineering the app but is not protection. The npm ecosystem's size means more supply-chain exposure to manage; pub.dev is smaller but not immune. Our approach to this is in the guide to [secure app development](/guides/secure-app-development).
Side by side
| Topic | React Native | Flutter |
|---|---|---|
| Language | JavaScript or TypeScript, with React | Dart |
| Interface | The platform's native views | Its own rendering engine |
| Look and feel | Follows each platform automatically | Identical by default, platform look reproduced |
| Performance | Good for business apps; watch main-thread work | Consistent animation; good for business apps |
| Native code | Native modules in Swift or Kotlin | Platform channels and FFI |
| Sharing with a React web app | Strong: types, logic, API clients | Little, separate toolkit |
| Hiring | Large JavaScript and React pool | Smaller pool, quick to learn |
| Updates without store review | Possible for JavaScript changes, within store rules | Third-party services only |
| Right-to-left | Supported; runtime direction change often needs a reload | Supported; follows the locale at runtime |
| Other targets | Mobile first; web through extra tooling | Mobile, web and desktop in one framework |
When we would pick each
- The team or the client already works in React and TypeScript.
- There is a web product whose logic and types the app can share.
- A native, platform-following feel matters more than pixel-identical screens.
- Fixing bugs without waiting for a store review would be valuable.
- A brand-led, custom interface must look identical on both platforms.
- The app relies on rich animation or custom drawing.
- There is no existing JavaScript team to build on.
- You may want desktop or web targets from the same stack later.
If the product depends on deep platform features or the best possible performance, native Swift and Kotlin may be the better answer. [Native or cross-platform](/blog/native-or-cross-platform) and the glossary entry on a [cross-platform app](/glossary/cross-platform-app) explain the choice.