Native & Cross-Platform Mobile App Development

iOS and Android Apps Built with React Native & Flutter for Exceptional Mobile UX

Agency33's mobile app engineering builds cross-platform and native mobile applications using React Native and Flutter. We integrate offline caching, push notifications, native biometrics (FaceID/TouchID), in-app purchases, and backend sync APIs, providing complete guidance through Apple App Store and Google Play Store certification.

Mobile responsive websites often fail to deliver the instant responsiveness, offline capabilities, and push engagement that mobile-first users expect from modern digital services.

High-performance mobile apps built with React Native or Flutter: a single shared codebase delivering true native 60fps performance on both iOS and Android with half the development cost.

  • Cross-platform mobile application codebase for iOS and Android (React Native / Flutter)
  • Push notification integration via Firebase Cloud Messaging (FCM) and OneSignal
  • Biometric security integration (FaceID, TouchID, Android Fingerprint authentication)
  • Offline-first data caching and background sync with cloud backend
  • Complete app deployment and approval submission for Apple App Store and Google Play Store
  • Source code repository handoff with App Store compliance documentation

Frequently Asked Questions

Why use React Native or Flutter instead of building two separate native apps?

React Native and Flutter allow us to maintain a single unified codebase that compiles to native code for both iOS and Android. This cuts development and maintenance costs in half while delivering authentic 60fps native performance.

Do you guarantee app approval in the Apple App Store and Google Play Store?

Yes. We design and test following strict Apple App Store Review Guidelines and Google Play Developer Policies, managing the entire submission process until official approval.

How do in-app push notifications work?

We integrate push engines like Firebase and OneSignal, allowing you to trigger automated transactional notifications, promotional alerts, and user re-engagement messages.

Can the app function offline when users have poor internet connectivity?

Yes. We engineer offline-first state architectures with SQLite or Realm local databases that allow users to access core features without an active internet connection and sync seamlessly once reconnected.