App Development
Cross-Platform App Development with Flutter and React Native
ConvertriX builds cross-platform apps in Flutter and React Native, so one codebase ships to both Android and iOS. For most business apps this means a single team, one release cycle and lower maintenance cost, with performance close to native. We pick the framework that suits your app, not the one we happen to prefer.
Overview
About our cross-platform apps (flutter / react native) service
Most Indian businesses need to be on Android, where the bulk of their users are, and on iOS, where a smaller but valuable segment expects to find them. Building two native apps doubles design, development, testing and every future update. A cross-platform app shares the business logic and most of the interface between platforms, so a new feature or a bug fix is written once and released to both stores together. For booking, ordering, field service, loyalty and customer portal apps, that trade-off is usually the right one.
Flutter and React Native both work well, but they suit different situations. Flutter draws its own interface, which gives consistent visuals on every Android version and smooth animation, and its compiled code performs well on budget phones. The trade-off is a larger base install size and Dart, a language fewer web teams know. React Native uses real native components and JavaScript or TypeScript, so it fits well if you already have a React web team or want to share code with a web app. Its new architecture has closed much of the old performance gap, though heavy animation needs more care.
As a Flutter app development team serving clients across India, we are also clear about when cross-platform is the wrong choice. Apps built around continuous background location, complex Bluetooth hardware, AR or heavy on-device processing may justify native Kotlin and Swift. Where only one or two features need deep platform access, we write small native modules inside the cross-platform app instead. Offline storage, UPI intents, the Razorpay SDK, FCM and APNs push all work well in either framework.
What's included
Everything in scope, written down
Framework recommendation
A written comparison of Flutter and React Native for your specific features, team and roadmap, with the reasons for the final choice.
Shared UI and UX design
Figma designs that share a common structure while respecting platform conventions such as back navigation, date pickers and system fonts.
Single codebase development
Flutter with Dart or React Native with TypeScript, structured with clear state management so the code stays maintainable as features grow.
Native modules where needed
Small Kotlin or Swift modules for features that need deeper device access, bridged cleanly into the shared app.
Offline storage and sync
Local databases such as SQLite, Hive or WatermelonDB, with queued actions and sync logic for users on unreliable networks.
Payments and push notifications
UPI intent flows, Razorpay or Cashfree SDK, and FCM and APNs notifications configured for both platforms.
Backend and admin panel
APIs and a web admin panel, or integration with the systems you already run.
Dual store launch
Play Console and App Store Connect setup, listings, privacy declarations and submission to both stores.
Process
How the project runs
- 1
Scoping and framework choice
We map features to platform capabilities, check for anything that needs native code, and agree on Flutter or React Native.
- 2
Design and prototype
Core flows are designed in Figma and reviewed as a clickable prototype on both an Android phone and an iPhone.
- 3
Sprint-based build
Features are built in two-week sprints with builds on Firebase App Distribution and TestFlight at the end of each one.
- 4
Cross-device testing
Testing on low-end and mid-range Android phones and on iPhones, covering performance, offline behaviour and payment edge cases.
- 5
Store submission
We prepare listings and declarations for both stores, handle Play closed testing and App Store review, and coordinate the release.
- 6
Launch and iteration
Crash and usage data are monitored after launch, and updates ship to both platforms from the same codebase.
Benefits
- Android and iOS apps from one team and one codebase
- New features and fixes released to both platforms together
- Lower long-term maintenance cost than two native apps
- Consistent experience for customers on any phone
- Room to add native modules when a feature needs them
Deliverables
- Framework recommendation and technical architecture note
- Figma designs for Android and iOS
- Published apps on Google Play and the App Store
- Full source code in a repository you own
- Backend APIs and admin panel, deployed to your cloud account
- CI/CD pipeline for building and releasing both apps
- Technical documentation and handover session
Tech & tools
- Flutter
- Dart
- React Native
- TypeScript
- Expo
- Riverpod
- Redux Toolkit
- SQLite
- Firebase Cloud Messaging
- Firebase Crashlytics
- Razorpay SDK
- Codemagic
- Figma
Pricing
How this is priced
Cross-platform apps are quoted per project. The main cost drivers are screen count, the number of user roles, offline sync, payment and third-party integrations, any native modules, and backend and admin panel scope. Because one codebase serves both platforms, adding iOS to an Android app costs far less than a second native build, though both stores still need their own testing and review. After a scoping call we send a fixed-scope quote broken into phases.
Get a fixed quoteFAQ
Cross-Platform Apps (Flutter / React Native): common questions
Is Flutter or React Native better for my app?
Flutter is usually the better fit for apps with custom visuals, heavy animation or a large share of budget Android users, because it renders consistently and performs well on low-end phones. React Native suits teams that already use React on the web or want to share code with a web app. Both are mature and well supported, so we decide based on your features, team and long-term plans.
Will a cross-platform app feel slower than a native one?
For most business apps, users will not notice a difference. Lists, forms, maps, payments and media all run smoothly in Flutter and React Native when built properly. Gaps appear mainly in graphics-heavy or hardware-intensive apps. We profile performance on low-end Android phones during development and move any genuinely heavy task into a native module if it is needed.
Can a cross-platform app use device features like the camera, GPS and biometrics?
Yes. Camera, GPS, biometrics, file access, contacts and push notifications are all available through well-maintained plugins in both frameworks. For less common hardware or SDKs without a plugin, we write a small native module in Kotlin or Swift and connect it to the shared code, so the rest of the app stays cross-platform.
Does a Flutter app make the download size bigger?
A Flutter app starts with a slightly larger base size than a minimal native app because it bundles its rendering engine. In practice we keep size down by compressing images, removing unused packages, splitting builds per device architecture and using Android App Bundles, so Play Store delivers only what each phone needs. This matters for Indian users with limited phone storage, so we check size at every release.
Related
Often paired with this service
Free quote
Get a quote for cross-platform apps (flutter / react native)
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