Mobile Apps
Mobile App Development for iOS and Android
QASTCO is a UK app development company that ships production apps, not prototypes. We build native iOS, native Android, and cross-platform apps using React Native and Flutter.
You get a dedicated project manager, bi-weekly TestFlight builds, and full App Store submission support. Our apps pass Apple and Google review first time, every time.
Get in Touch- Native iOS development with Swift and SwiftUI
- Native Android development with Kotlin
- Cross-platform apps with React Native or Flutter
- UX research and interactive prototyping
- Automated QA testing on 50+ real devices
- App Store and Google Play submission handled
End-to-End App Development Company Services
From concept to App Store listing, we handle the full lifecycle.
iOS App Development
Swift and SwiftUI apps optimised for iPhone and iPad, with push notifications and in-app purchases.
Android App Development
Kotlin apps built with Material Design 3. Tested across Samsung, Pixel, and budget handsets.
Cross-Platform Apps
React Native or Flutter. One codebase, two platforms, 60% lower cost than two native builds.
UX/UI Design
User research, wireframes, and Figma prototypes validated with your target audience before a single line of code.
QA & Device Testing
Automated test suites run on 50+ physical devices via BrowserStack. We catch bugs before your users do.
App Store Launch
We write store listings, capture screenshots, and manage the Apple/Google review process for you.
Our Mobile App Development Process
You see a working build every two weeks. No long silences.
Research & Prototype
User interviews, competitor analysis, and a clickable Figma prototype you can test on your phone.
Build & Iterate
Two-week sprints with TestFlight/Firebase builds. You test real features on real devices at every stage.
Launch & Grow
App Store submission, ASO optimisation, and a 90-day post-launch support window included.
Mobile App Development FAQs
It depends on your audience. If your users are split across both platforms, we recommend cross-platform development using React Native or Flutter, which gives you one codebase for both iOS and Android at roughly 60% of the cost of two native builds.
Mobile apps start from £10,000 for a simple single-platform app. Cross-platform apps with user accounts, push notifications, and API integrations typically range from £15,000 to £40,000. We provide a fixed quote after scoping your requirements.
A basic app takes 8 to 12 weeks. Feature-rich apps with payment processing, real-time data, and third-party integrations take 16 to 24 weeks. We release a testable build every two weeks so you can track progress.
Yes. We manage the full submission process for both the Apple App Store and Google Play Store. This includes preparing screenshots, writing store descriptions, configuring metadata, and handling any review feedback from Apple or Google.
We offer ongoing app maintenance covering OS compatibility updates, bug fixes, performance monitoring, and new feature development. Both Apple and Google require apps to stay updated, so a maintenance plan keeps your app running and compliant.
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