One code base for Android and iOS, or two native apps? A practical comparison of cost, speed, performance and long-term maintenance.
If you need an app on both Android and iPhone, the first big decision is how to build it. You can write two separate native apps, or use a cross-platform framework — Flutter or React Native — to build both from one code base. Each approach has real strengths. This guide compares them on the points that matter to a business.
The three options in one line each
- Native: one app in Kotlin for Android and one in Swift for iOS. Maximum performance and access to every phone feature, but two code bases.
- Flutter: Google's framework. One code base in Dart that draws its own interface, so the app looks the same on every phone.
- React Native: Meta's framework. One code base in JavaScript or TypeScript that uses the phone's native interface components.
Side-by-side comparison
| Native (two apps) | Flutter | React Native | |
|---|---|---|---|
| Code bases | Two | One | One |
| Typical cost for both platforms | Highest | Lower | Lower |
| Time to launch | Longest | Short | Short |
| Performance | Best | Very good | Good to very good |
| Look and feel | Fully platform-native | Identical on both, fully custom | Close to native components |
| Good fit for | Heavy graphics, AR, deep hardware use | Most business and consumer apps | Teams already using React |
When native is worth the extra cost
Native development makes sense when the app depends heavily on the phone itself: advanced camera processing, augmented reality, complex animations at high frame rates, Bluetooth hardware, or features Apple and Google release first for native code. It also suits companies that already have separate Android and iOS teams.
The trade-off is cost and speed: every feature is built and tested twice, and the two apps can drift apart over time unless both teams stay in step.
Why most business apps choose cross-platform
Booking apps, ordering apps, field-service tools, customer portals, e-commerce and internal company apps rarely need anything a modern cross-platform framework cannot do. With one code base you get:
- one team and one set of features to build and test;
- both apps launching on the same day;
- lower maintenance cost every year after launch;
- easy access to common features — camera, location, push notifications, payments — through well-maintained plugins.
Flutter or React Native?
Both are mature and used in large production apps. In our experience the deciding factors are practical:
- Choose Flutter when you want a highly custom, branded interface that looks exactly the same everywhere, and smooth performance with less platform-specific tweaking.
- Choose React Native when your web product is built in React and you want to share knowledge and some code between the website and the app, or when your team already works in JavaScript.
Do not forget the backend and admin panel
An app is rarely just the app. Bookings, orders, users and content live on a server, and someone has to manage them. Plan for an API (for example in Laravel or Node.js) and a web admin panel from the start — they are often a third or more of the total project.
A simple way to decide
- List the phone features the app truly needs on day one.
- If any of them is unusual (AR, specialised hardware), get a native opinion first.
- Otherwise, start cross-platform and launch both apps together.
Want a second opinion on your idea? Read about our mobile app development service, try the cost calculator, or hire a Flutter developer for your team.