Why We Build Mobile Apps With React Native

Maintaining separate iOS and Android codebases means duplicating every feature, every bug fix and every design change. Two teams, two review cycles, two App Store submissions for every release. For most businesses, the incremental quality gain of pure native does not justify the doubling of engineering cost and time-to-market.

React Native shares business logic, data fetching, state management, navigation and most UI components across iOS and Android from a single TypeScript codebase. Platform-specific code — camera permissions, payment sheet behaviour, push notification handling — is isolated in platform files where it belongs. In practice, 80–90% of the codebase is shared.

The result is that a React Native project typically ships in 40–60% of the time of an equivalent dual-native project, with a single team maintaining a single codebase post-launch. For startups and growing companies with limited engineering capacity, this is the difference between a six-week MVP and a three-month one.

If your web frontend is built in Next.js — which ours typically are — your web developers can contribute to the mobile codebase. Validation schemas, utility functions, API client code, business logic and type definitions are shared between the web and mobile codebases. This eliminates the parallel implementation of the same logic in two different languages.

TypeScript across the full stack means the same type safety that catches bugs in the API layer catches bugs in the mobile UI. API response types defined once in a shared package are consumed by both the web frontend and the mobile app. When the API changes, TypeScript reports every affected call site across both codebases.

The JavaScript/TypeScript ecosystem also means access to npm — the world's largest package registry. React Native can consume almost any JavaScript library, including AI SDKs, analytics tools, payment integrations and utility libraries, without waiting for a platform-specific port.

Expo transforms React Native from a framework into a complete mobile development platform. The Expo managed workflow handles iOS and Android build infrastructure in the cloud — no macOS machines, no Xcode configuration, no Gradle debugging required. This dramatically reduces the DevOps overhead of mobile development, particularly for teams without dedicated mobile infrastructure engineers.

Over-the-air updates via Expo Updates allow JavaScript bundle changes to reach devices without an App Store submission. Bug fixes, UI changes and content updates ship in minutes, not the 1–3 day App Store review cycle. Expo's usage policies allow JavaScript-layer updates; native code changes still require a store submission.

Expo SDK provides device API access — camera, biometrics, location, calendar, contacts, sensors — through a consistent TypeScript interface that handles the underlying iOS and Android differences. This eliminates the need for custom native modules for the vast majority of device capabilities.

React Native was created at Meta and powers Facebook, Instagram and other Meta products used by billions of users daily. It is also used in production by Shopify, Microsoft (Office, Xbox), Coinbase, Discord, Bloomberg and thousands of other companies. The framework has been battle-tested at a scale that few alternatives can claim.

This production history matters for choosing a framework. The edge cases — memory management, animation performance, large list rendering, background processing, deep linking — have been encountered and solved at scale. The solutions are documented, the community is large and the tooling ecosystem is mature.

Long-term framework risk is lower for Meta-backed React Native than for community-maintained alternatives. The React Native New Architecture (JSI) represents Meta's continued multi-year investment in the framework — not a maintenance mode framework approaching end of life.

The original React Native bridge — asynchronous JSON serialisation between JavaScript and native code — was the primary source of animation jank and interaction latency in complex apps. The New Architecture replaces this with JSI (JavaScript Interface), a synchronous C++ interface that allows JavaScript to call native code without serialisation overhead.

JSI enables Fabric (the new rendering system) and TurboModules (the new native module system). Animations and gestures that previously required Reanimated workarounds to avoid bridge overhead now run synchronously. List performance, gesture response and transition animations are measurably closer to pure native at the framework level.

The New Architecture is stable in React Native 0.74+ and is the default in new Expo projects. For projects requiring high-performance animations, real-time data visualisation or complex gesture interactions, the gap between React Native and pure native has narrowed significantly since the architecture transition.