Cross-Platform App Development: One Codebase for iOS and Android

Cross-platform app development means writing one codebase that runs as a real app on both iOS and Android. For most founders it's the default choice, because building and maintaining two separate native apps roughly doubles the work for the same features. Frameworks like React Native and Flutter have matured to the point where users usually can't tell the difference. Here's how it works, where the tradeoffs are, and the specific cases where fully native development is still worth paying for.

How cross-platform development works

With React Native, developers write the app in JavaScript or TypeScript using React. The framework turns that into real native interface components on each platform, so buttons, lists and navigation behave the way iPhone and Android users expect. When the app needs something platform-specific, such as a particular device sensor, developers can drop down to native code for just that piece. Expo adds tooling for builds, updates and common device features on top.

React Native vs native development

Real apps built cross-platform

Every mobile app in our portfolio is cross-platform. Gigswap runs on React Native with real-time chat, location-based discovery, in-app subscriptions and ID and face verification. SFL uses Expo and React Native with GPS and QR check-in, push notifications and live leaderboards. CoachPilot's client app uses Expo for daily workouts, meal plans and chat with their coach. None of these needed separate native apps to deliver their core features.

When native development is worth it

• Graphics-heavy apps such as games or advanced photo and video editing.
• Apps that live on cutting-edge platform features from the day they ship.
• Deep, continuous hardware integration (specialized Bluetooth devices, AR at the core).
• Large companies with separate iOS and Android teams already in place.

What to ask a cross-platform team

• Which framework do you use, and why for this app?
• How do you handle the features that need native code?
• Do you test on real iOS and Android devices before release?
• How are updates shipped, and can small fixes go out without a full store review?
• Will I own the code and the app store accounts?

What cross-platform means for cost and maintenance

With one codebase, every feature, fix and update is written once and released to both stores. That doesn't make the second platform free: you still test on both, prepare two store listings and handle the occasional platform difference. But it's much closer to the cost of one app than two, and the savings continue every year in maintenance.

• One team instead of separate iOS and Android teams.
• Fixes and features ship to both platforms together.
• Shared logic with a React web app when you use React Native.
• Over-the-air updates for many small fixes (with tools like Expo), within store rules.

Common myths about cross-platform apps

• "Cross-platform apps feel like websites." React Native renders native components; users generally can't tell.
• "You can't use device features." Camera, location, push notifications and payments are all standard.
• "You'll have to rewrite it later." Many large, long-running apps are built cross-platform.