Shipping with React Native: How We Build for iOS and Android Without Double Effort

One question comes up often when working with founders: “Do we need both apps right now?”

From what we’ve seen across Eternalight’s client work, the answer is almost always yes. Users live in different ecosystems, and ignoring one inevitably limits reach.

• In India and other emerging markets, Android is dominant.
• In the US, Europe, and parts of East Asia, iOS owns the premium audience.
• Products in fintech, health, productivity, transport, commerce, and social need presence on both platforms to stay competitive.

In practical terms, going dual-platform helps companies:

• Access the broadest possible user base
• No need to rely on one coding environment
• Improve engagement and retention
• Control the UX far more than a mobile web app can

Thus, when users split across iOS and Android, sticking with a single version may impact engagement. Even early-stage startups now prefer shipping at least a basic version on both stores. It’s worth to build iOS and Android app version using React Native for a company's growth beyond its imagination.

Before choosing React Native for most Eternalight projects, we compared what pure native development actually means. Native apps can attract users, but we can’t neglect their trade-offs.

Advantages of Going Fully Native

• Consistent, predictable performance
• Immediate access to the latest platform APIs
• Strong compatibility with camera, maps, Bluetooth, and hardware layers
• Smooth animations and UI transitions

Disadvantages of Native Development

• Two separate codebases
• Two developers or teams
• Higher cost and slower development cycles
• Every feature has to be built twice
• Twice the testing, twice the maintenance burden

Native app development for iOS and Android separately is best when you can stretch the budget without any burden and have intellectual minds to shape it up. However, as the days pass, it becomes difficult to manage the regular progress, and it becomes a tech blocker.

For businesses that need to move fast, this is often where the conversation shifts toward hybrid frameworks.

React Native lands in a sweet spot for most product teams: fast development, near-native performance, and a shared JavaScript/TypeScript codebase.

In our experience, React Native works well when:

• The app relies heavily on UI and API-driven screens
• The team wants to ship features quickly
• Budget, timeline, or staffing constraints exist
• The product is evolving fast, especially in early-stage cycles
• Over-the-air updates are valuable

When Native Still Makes More Sense?

React Native isn’t the best fit for:

• Heavy multimedia editing
• High-end gaming
• Low-latency hardware integrations
• Deep, platform-specific capability
• Certain offline-first encrypted storage patterns

But most apps fall into a middle zone where React Native covers around 90% of the requirements, and a few native modules fill the rest.

We’ve evaluated Flutter, Ionic, and Xamarin on various projects. They each have strengths, but React Native tends to better align with real-world constraints for building iOS and Android apps.

Why React Native Often Feels More Practical?

• Uses JavaScript/TypeScript—languages most teams already know
• Mature ecosystem: React Navigation, Zustand/Redux, Reanimated
• Strong community support and issue resolution
• Easy hiring compared to other ecosystems
• CodePush enables near-instant UI updates
• Plays nicely with design systems and custom components
• Integrates more naturally with native modules when needed

Flutter is solid, but the Dart adoption curve, larger binary sizes, and a custom rendering engine don’t always align with business priorities.

It’s been a very challenging phase for many mobile app development teams who struggle during their first iOS app releases. However, we have discovered the way to deal with this. Here are the steps that have consistently worked for us, which may also work for your team.

Android Deployment & Keystore Setup

Create Your Release Keystore

keytool -genkeypair -v -storetype PKCS12 \

  -keystore my-release-key.keystore \

  -alias my-key-alias \

  -keyalg RSA -keysize 2048 -validity 10000

Move it into:

android/app/my-release-key.keystore

Add Credentials to gradle.properties

MYAPP_UPLOAD_STORE_FILE=my-release-key.keystore

MYAPP_UPLOAD_KEY_ALIAS=my-key-alias

MYAPP_UPLOAD_STORE_PASSWORD=your_store_password

MYAPP_UPLOAD_KEY_PASSWORD=your_key_password

Configure build.gradle

signingConfigs {

  release {

    storeFile file(MYAPP_UPLOAD_STORE_FILE)

    storePassword MYAPP_UPLOAD_STORE_PASSWORD

    keyAlias MYAPP_UPLOAD_KEY_ALIAS

    keyPassword MYAPP_UPLOAD_KEY_PASSWORD

  }

}

Generate the Release AAB

cd android
./gradlew bundleRelease

Upload the AAB to the Play Console.

iOS Deployment (The Flow That Rarely Breaks)

While using React Native for the iOS app phase is straightforward for those who regularly use it, it initially seems complicated to everyone. Our developers have followed this flow to drive consistency in our work and solve puzzle-like scenarios.

Open:

ios/YourApp.xcworkspace

Choose:

Any iOS Device (arm64)

Then:

Product → Archive → Distribute App → App Store Connect → Upload

Next, need to update metadata, upload the screenshots, and privacy details in App Store Connect. Once done, we can hit submit for review.

Environment Variables Using react-native-config

To avoid any mihapps encounters and maintain cleanliness, that's what every react native app development team prefers:

.env

API_BASE_URL=https://api.example.com

Usage:

import Config from 'react-native-config';

api.get(`${Config.API_BASE_URL}/auth`);

Utilizing CodePush: Over-the-Air Updates

CodePush is one of the most underrated advantages of React Native. For UI fixes and small patches, it saves days of waiting for App Store review.

Install

npm install react-native-code-push

Wrap the Root Component

import codePush from 'react-native-code-push';

const options = {

  checkFrequency: codePush.CheckFrequency.ON_APP_START,

};

export default codePush(options)(App);

Release an Update

appcenter codepush release-react -a <owner>/<app> -d Production

Hope this guide will help you to build iOS and Android app using React Native.