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A desk by a window with a city view on a rainy night: a single codebase (TypeScript) on the laptop, with the same app on iOS and Android phones on either side; when the code updates, both apps refresh together; above, holographic panels for one codebase, iOS, Android and an API shared with the web
Module 02 · Mobile Apps

React Native App Development: iOS and Android from One Codebase

In our React Native app development service, we write a single codebase. Both the iOS and Android versions come from this shared code. We also connect the app to the same API infrastructure as your website. That keeps data consistent across every channel and makes development more efficient.

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In depth
01

One Codebase and a Shared API in React Native App Development

We build the iOS and Android interfaces from the same JavaScript or TypeScript code. Where platform-specific behaviour is needed, we split the code and keep the rest of the logic shared. That's why we update both versions together, with the same business logic.

The real gain, though, comes from web and mobile drawing on the same API. For example, we define the product catalogue, user account, order or appointment logic in one place on the server. Both clients then reach that logic through the same endpoints. As a result, stock information, price updates or user permissions change on every channel at the same time. And the sharing isn't limited to the interface layer. We can also share validation rules and some business logic functions between web and mobile.

02

React Native or Flutter for Cross-Platform Development?

Flutter also targets both platforms from a single codebase. However, it runs on the Dart language and its own rendering engine. So the know-how of a web team that works in React and JavaScript can't carry over to mobile.

That's why we choose React Native: the team that builds your web interface carries its component logic over to mobile as is. Mature libraries in the npm ecosystem also offer ready-made modules for common needs such as authentication and payments. Because the architecture talks directly to native components, the interface feels close to the platform's built-in components. In short, if your website and app grow together, sharing code and knowledge delivers real efficiency. A single codebase is still not exempt from store rules, though. For example, the App Store Review Guidelines apply the same criteria to every app.

03

Our React Native App Development Process

We run the project in six steps, because a shared codebase needs a solid architecture from the start. First we define the layer to share with the web, then the platform-specific points. That way, we can ship the same release to both stores together.

  1. First, we review your website's API and work out which endpoints the mobile app will use.
  2. Next, we separate the shared codebase from the points that need platform-specific behaviour.
  3. We set the code into a layered TypeScript structure and centralize state management.
  4. Where device-specific features require it, we add native bridge modules.
  5. After that, we set up the release pipeline and run every release through the same automated checks.
  6. Finally, we submit the iOS and Android builds to both stores in parallel.

This way, web and mobile grow together with one team and one API.

01 One codebase One codebase: two branches splitting from a JavaScript / TypeScript code window to iOS and Android — illustrative graphic At the top, a code window with "JavaScript / TypeScript" in its top bar and six lines of code inside. A trunk runs down from the window and splits in two; each branch ends in a phone frame, with "iOS" under the left one and "Android" under the right. At the very bottom is a shared band that both phones rest on: "Shared API layer". In the animation, the code lines enter in sequence, then the branches draw in. JavaScript / TypeScript iOS Android Shared API layer
02 Platform-specific point Platform-specific point: a split point on the trunk coming down from the shared codebase, with two side arms — illustrative graphic At the top is a "shared codebase" box. The main trunk running down from it is drawn first; on the trunk sits a diamond-shaped split point with a small fork icon inside. Two short arms run left and right from the split to "iOS module" and "Android module" boxes, each with a dashed "native when needed" note beneath it. The main trunk continues straight down to a "Shared code" label, with a "the rest of the logic is shared" note at the bottom. shared codebase iOS module if needed: native Android module if needed: native Shared code the rest of the logic is shared
03 Why React Native React Native and Flutter cards compared side by side — illustrative graphic Two equal-sized cards side by side. On the left, "React Native": "JavaScript / TypeScript" in the language badge, with three feature rows below — one codebase, npm ecosystem, native components. On the right, "Flutter": "Dart" in the language badge, with three rows below — one codebase, its own rendering engine, release to two platforms. The left card has an accent border; the right card has a neutral border, but its text is just as bright as the left card's, with no negative mark on it. A single line at the bottom: "same team and component logic as the web". React Native or Flutter React Native JavaScript / TypeScript Flutter Dart one codebase one codebase npm ecosystem own rendering engine native components release to two platforms efficient code and knowledge sharing
Illustrative graphic. The first stop shows iOS and Android coming out of a single JavaScript/TypeScript codebase, with the shared API layer beneath them. At the second stop, we marked the platform-specific point and the native module that runs only there. At the last stop, we placed React Native and Flutter side by side. We drew the boxes as example interfaces and showed the code lines as bars to avoid inventing names. The two cards are deliberately the same size, and the Flutter points repeat the wording on this page. So the comparison isn't a score; it sums up why we choose as we do. We drew no logos; the badges are text only.

For the current price and timeline range, see the pricing section on our Mobile Apps page — you can pin down the range for your scope in two minutes.

Prepared by: TasarımMania Mobile App Team · Last updated: 21 October 2026

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FAQs

Frequently asked questions: React Native app development

Does an app built with React Native run slower than a native app?

You won't feel a difference in everyday use, because the interface components are tied to the platform's native components. In the rare cases that need heavy graphics or complex animation, we move that module to native code.

Why do you recommend React Native over Flutter?

Because Flutter runs on Dart, your web team's React know-how doesn't help there. With React Native, the same team shares component logic, so the project moves more efficiently.

What's the benefit of using the same API as our website?

We define product, user and order data once on the server. Because web and mobile call the same endpoints, there's no need to keep two separate data sources in sync. An update you make on one side shows up on the other automatically.

How do you release to both stores in React Native app development?

We run the shared code through each platform's build step to get separate iOS and Android packages. Then an automated release pipeline prepares the packages for submission.

Which projects need native code because React Native isn't enough?

In projects that need heavy sensor processing or highly platform-specific graphics, we write that module natively. The rest of the app, however, stays in React Native.

Can a React Native app be moved to native later?

Yes. When we build the architecture in modules, we can move screens or features to native code one by one. And because the move is gradual, the existing app keeps running without interruption.

Do you use JavaScript or TypeScript in projects?

Both work with React Native. As the app grows, though, we lean on TypeScript's type safety.

What is the difference between a cross-platform app and a native app?

We call the approach that ships to two platforms from one codebase cross-platform. In the native approach, we write separate code for each platform. So we make the choice together, based on the project's hardware and graphics needs.

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Details

If you'd like to look before deciding

  1. 01

    Native Bridge and Third-Party Module Integration

    We reach device-specific capabilities through the native bridge layer. The camera, biometric login and push notifications, for example, work this way. As a result, ready-made community modules cover most needs. When special hardware is involved, we write a small native module.

  2. 02

    State Management and Scalable Project Architecture

    Data flow between screens becomes critical as the app grows. That's why we set up a layered folder structure and centralized state management. We also gather API calls and error handling in a separate service layer.

  3. 03

    CI/CD and the Store Release Pipeline

    We connect building, signing and uploading the code to the stores in one automated pipeline. That way, every release goes through the same checklist. As a result, shipping to both stores in parallel becomes an ordinary routine.

LIVE LOOP

Launch on Both Platforms at Once with One Codebase

In short, let's build your React Native app development project with one team, on an API shared with your website. You'll find quote and process details for your project scope in the pricing section. If you prefer, you can also talk to our team directly.

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