Mobile App Development
iOS and Android apps with React Native or Flutter, built to work even offline.
In short
OSTORDEV Mobile App Development builds iOS and Android apps from one codebase with React Native or Flutter, or natively in Swift and Kotlin when the product requires it. We design for unreliable networks with offline-first sync and handle App Store and Google Play releases. Apps start from $350.
Starting from $350
Updated
What's included
Cross-platform apps
One React Native or Flutter codebase for iOS and Android, usually faster and cheaper to build than two separate native apps.
Native when it matters
Swift and Kotlin modules for heavy media, Bluetooth, or platform APIs that cross-platform tools do not cover well.
Offline-first sync
Local storage, background sync, and conflict rules explained in our offline-first guide.
Push & engagement
Segmented push notifications, deep links, and in-app messaging tied to analytics events.
Store releases
App Store and Google Play submissions, review responses, and staged rollouts.
Backend & APIs
Secure APIs and admin panels hosted on cloud infrastructure sized for your traffic.
What you receive
- iOS and Android apps published under your developer accounts
- Source code and build pipelines in your repository
- Backend API and admin dashboard
- Crash reporting and product analytics dashboards
- Release checklist and store listing assets
Technologies we use
- React Native
- Expo
- Flutter
- Swift
- Kotlin
- SQLite
- Firebase
Who it's for
Consumer apps
Booking, fitness, marketplace, and loyalty apps that users keep on their home screen.
Field operations
Apps for technicians, sales reps, and delivery teams that keep working without a signal.
Companion apps
Mobile access to an existing web platform, sharing the same API and business rules.
How we deliver
- 1
Discovery
User journeys, platform choice, and offline requirements agreed before design starts.
- 2
Prototype
Clickable prototype tested with real users to validate the core flows.
- 3
Build
Sprints with TestFlight and internal Play builds so you test on real devices every week.
- 4
Release
Store submission, staged rollout, and crash monitoring during the first weeks.
Frequently asked questions
React Native or Flutter: which should I choose?
Both produce high-quality apps. React Native fits teams that already use React on the web and want to share logic. Flutter excels at custom, animation-heavy interfaces. We recommend one after discovery based on your team and roadmap.
How long does it take to build a mobile app?
A focused MVP usually takes 8 to 14 weeks including store review. Apps with complex offline sync, payments, or hardware integrations take longer.
Can the app work without internet?
Yes. We use an offline-first architecture with local storage and background sync so the app stays usable on poor networks. Details are in our article on offline-first mobile apps.
Do you publish the app to the stores?
Yes. We prepare store listings, handle submission and review feedback, and publish under your own developer accounts so you keep full ownership.
Related products
UI/UX Design
User research, prototypes, design systems, and accessibility reviews for web and mobile products.
Cloud & DevOps
Cloud architecture, migrations, CI/CD pipelines, containers, and cost optimization.
Maintenance & Support
SLAs, monitoring, security updates, backups, bug fixes, and monthly improvement hours.
Let's scope your project
Send us your goals and constraints. You will receive a written proposal with scope, timeline, and budget within 48 hours.
Request a proposal