Services / Mobile App Development / Custom Application Development
Mobile App Development
Mobile App Development

Custom Application Development

Custom mobile app development for iOS and Android — bespoke applications built from scratch for your exact use case, designed for real users, and tested on real devices.

10–20 wks
Typical Delivery
iOS & Android
Platforms Supported
4.9
Avg. App Store Rating

When your mobile app use case does not fit a template, you need a custom mobile application designed from the ground up — one that reflects your brand precisely, supports your unique user journeys, and integrates with your backend infrastructure exactly the way your business needs. We build custom iOS and Android mobile applications that are performant on real devices, accessible to real users, and engineered to grow as your product scales.

We have built custom mobile applications for field service management, on-demand delivery, healthcare patient engagement, fitness and wellness, fintech payments, real estate property search, and enterprise workforce tools — deployed on iOS and Android with cumulative App Store ratings above 4.8 across our client portfolio. Our mobile development process is UX-research-led: we build user journey maps and clickable prototypes that are validated with real target users before a line of production code is written.

Every custom mobile application we deliver includes offline-first data architecture for users in low-connectivity environments, deep linking for shareable content, push notification infrastructure, background sync, biometric authentication, and crash monitoring via Sentry or Firebase Crashlytics. App Store and Google Play submission — including metadata optimisation, screenshot design, and review query management — is handled as part of our standard delivery, not billed separately.

+12 alerts
✓ Synced
98% Score
9:41●●●
Analytics
Messages
Security
£48.2K
Revenue this month
2,840
Active users
React Native Flutter TypeScript Firebase REST APIs SQLite Push Notifications Sentry Fastlane AWS
  • User research, journey mapping, and clickable UX prototype with user testing
  • Custom UI design system aligned to your brand and platform HIG/Material guidelines
  • Full iOS and Android application build with automated test suite
  • Backend API integration with offline sync, conflict resolution, and background refresh
  • App Store and Google Play submission with optimised metadata and screenshots
  • Post-launch crash monitoring, error alerting, and 30-day bug resolution support

Why RapideKops?

  • UX design is a first-class engineering discipline — not an afterthought or wireframe handoff
  • Offline-first architecture ensures the app is usable in tunnels, basements, and rural areas
  • Performance profiled on real low-end Android devices — not just the latest flagship hardware
  • Deep linking, push notifications, and biometric auth implemented correctly from day one
  • WCAG mobile accessibility guidelines met — accessible to users with disabilities as standard
  • Source code, certificates, signing keys, and App Store accounts remain entirely yours

Our Delivery Process

01

Discovery & UX Design

We map user journeys, design wireframes, and build a clickable prototype — validated with real target users before writing a single line of production code.

02

Visual Design

We translate wireframes into a pixel-perfect design system aligned to your brand. Every screen reviewed and approved before development sprint begins.

03

Build & Test

Two-week sprints with internal builds pushed to TestFlight and Firebase App Distribution for review on real physical devices at every milestone.

04

Submit & Monitor

We manage App Store and Play Store submissions end-to-end, respond to review queries, and monitor crash rates and user feedback for 30 days post-launch.

Frequently Asked Questions

How do you decide between building natively or cross-platform?
We evaluate the decision based on your specific requirements. Native (Swift/Kotlin) is the right choice when you need deep OS integration, maximum performance, or features cross-platform frameworks do not yet support well. Cross-platform (React Native, Flutter) is the right choice when you want to ship iOS and Android simultaneously at lower cost and your feature set does not require native-only capabilities.
How long does it take to build a custom mobile app?
A well-scoped custom mobile app typically takes 10–20 weeks from kickoff to App Store submission. This includes UX research and wireframing (2–3 weeks), visual design (2 weeks), development sprints (6–12 weeks), and testing and store submission (2 weeks). Complexity drives the range.
Do you handle App Store and Google Play submissions?
Yes — completely. We manage app signing, provisioning profiles, metadata, screenshots, privacy policy linking, and the submission process for both stores. We respond to App Store review queries on your behalf and manage any rejection resolution. Store submission is included in our standard delivery.
How do you ensure the app works without an internet connection?
We implement an offline-first architecture where user data is stored locally in SQLite or a local database first, then synced to the backend when connectivity is available. Conflict resolution logic handles cases where the same record was modified both offline and on the server. The app works fully in airplane mode.
What happens if the App Store rejects our app?
App Store rejections are common and almost always resolvable. We proactively design to App Store guidelines to minimise rejection risk. When a rejection does occur, we respond to the reviewer within 24 hours, make the required changes, and resubmit. The most common rejection reasons are issues we handle routinely.

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Tell us your app idea and target users — we will design, build, and ship a mobile experience that earns five-star reviews.