Mobile App Development Agency for iOS & Android

We build for iOS and Android. Using React Native, we create cross-platform apps from a single codebase that run natively on both platforms. We also offer native iOS (Swift) and native Android (Kotlin) development for projects requiring deep platform-specific integration.

React Native is ideal when you need both iOS and Android with a shared codebase - it reduces development costs by 30-40% and accelerates time to market. Native development (Swift/Kotlin) is recommended for apps requiring complex 3D graphics, AR/VR features, heavy animations, or deep OS-level integration that React Native cannot easily access.

The module list decides, not the number of screens, so here are the scopes we actually build. A first version with accounts and one core feature is 9-15 weeks. An MVP with accounts, payments, content and an admin panel is 9-16 weeks. The same MVP with third-party integrations is 10-18 weeks. A mobile app with the full module list, from chat and video to AI, offline mode and compliance, is 18-36 weeks. These weeks come out of the hours we quote for the same scopes, at 18 focused hours per person per week, so the calendar moves with the size of the team. Compressing it does not make the work smaller: more people in parallel means more coordination, which we count as more hours rather than fewer weeks. We put dates in writing after discovery, when the module list is fixed. Time your own scope module by module at kultrix.com/cost-calculator.

We publish the hours and the rate instead of one number, because the number is those two multiplied. Design and development is $35 per hour, QA and testing and project management are $20 per hour each, and a full team blends to $30.50 per hour. A first version with accounts and one core feature is 480-790 hours over 9-15 weeks, which is $15,000-$24,000 at our rates. An MVP with accounts, payments, content and an admin panel is 800-1,410 hours over 9-16 weeks, or $24,000-$43,000. The same MVP plus third-party integrations is 890-1,640 hours, or $27,000-$50,000. A mobile app with every module we build, from chat and video to AI, offline mode and compliance, is 1,950-3,900 hours, or $59,000-$119,000. Modules do not simply add up: we multiply the total by 1.25, because the glue between them, end-to-end testing and the release cycle belong to no single module. We work fixed-price on a defined scope and time-and-materials when the product is still moving. Price your own scope module by module at kultrix.com/cost-calculator.

Yes. We handle the entire submission process including creating App Store Connect and Google Play Console accounts, preparing screenshots and app descriptions, configuring privacy policies, and navigating the review process. We ensure compliance with both Apple and Google guidelines to avoid rejection.

Absolutely. We regularly build mobile apps that connect to existing REST APIs, GraphQL endpoints, Firebase, Supabase, or custom backend systems. If you need a new backend, we build that too - typically with Node.js and PostgreSQL.

We offer ongoing maintenance plans that include bug fixes, OS compatibility updates (new iOS/Android versions), performance monitoring, crash reporting analysis, and feature development based on user feedback and analytics data. Most successful apps require continuous iteration post-launch.

Yes. Our UI/UX designers create the complete mobile experience - from user research and wireframes to interactive prototypes and pixel-perfect visual design - before development begins. We follow Apple Human Interface Guidelines and Google Material Design principles while creating a unique branded experience.

We optimize at every level: efficient rendering with virtualized lists, optimized images and assets, minimal re-renders through proper state management, native modules for CPU-intensive tasks, code splitting, and thorough performance profiling. We target 60fps animations and sub-2-second cold start times.

Yes. We integrate push notification services (Firebase Cloud Messaging, OneSignal, or Apple Push Notification Service) for user engagement. For analytics, we integrate tools like Mixpanel, Amplitude, or Firebase Analytics to track user behavior, retention, and conversion funnels.

Yes. We implement offline-first architectures using local databases (SQLite, WatermelonDB), optimistic UI updates, background sync, and conflict resolution. This ensures your app remains functional when users have poor or no internet connectivity.

A native mobile app is installed from the App Store/Google Play and has full access to device features (camera, GPS, sensors, notifications). A PWA is accessed via a web browser and has limited device access. Native apps offer better performance and user experience, while PWAs are easier to distribute. We help you choose the right approach based on your needs.