Development ยท Mobile apps

Mobile app development
for iOS, Android & beyond

Custom mobile apps built for real users and real business outcomes. Native iOS and Android, cross-platform with React Native and Flutter, API integrations, App Store and Google Play publishing, and long-term support from a Berkshire team with platform-scale experience.

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Addbox delivers custom mobile app development for startups, scale-ups, and established businesses across the UK. Based in Newbury, Berkshire, we design and build iPhone apps, Android apps, and cross-platform products that connect to your existing systems, handle real transaction volume, and stay maintainable after launch.

Whether you need a consumer app, a B2B field tool, a SaaS companion app, or an MVP to validate an idea, we help you choose the right approach: native iOS development, native Android development, React Native, Flutter, or a hybrid model that fits your roadmap and budget. Our team has shipped products used by millions of people and integrated with more than 50 payment and service providers.

Search terms people use for this work include mobile app development, app development agency, iOS app developer, Android app developer, cross-platform app development, React Native developer, Flutter developer, custom mobile app development UK, mobile app development Berkshire, and build a mobile app for my business. This page covers how we deliver that work in practice.

Native iOS app development

When you need the best performance, deepest Apple platform integration, or a premium iPhone and iPad experience, native iOS development is often the right choice. We build with Swift and modern Apple frameworks.

Swift

Apple's modern language for iOS, iPadOS, watchOS, and macOS apps. We use Swift for performant, type-safe native iPhone and iPad applications.

SwiftUI

Declarative UI framework for building responsive iOS interfaces with less code. Ideal for new apps and features that need rapid iteration.

UIKit

Mature iOS UI framework still used for complex custom interfaces, legacy codebases, and fine-grained control over layout and behaviour.

Xcode & Apple tooling

Standard iOS development environment for building, debugging, profiling, and preparing releases for TestFlight and the App Store.

App Store Connect

Submission, beta distribution via TestFlight, release management, and compliance with Apple review guidelines and App Store policies.

Apple platform APIs

Push notifications (APNs), Sign in with Apple, in-app purchases, HealthKit, Core Location, camera, biometrics (Face ID, Touch ID), and Wallet integrations.

Native Android app development

Android reaches the widest mobile audience globally. We build native Android apps with Kotlin and Java, following Google Play requirements and Material Design patterns where they help usability.

Kotlin

Google's preferred language for modern Android development. Concise, safe, and well suited to new apps and refactors from older Java codebases.

Java

Established Android language still common in enterprise and legacy apps. We maintain and extend Java Android projects as well as building new ones in Kotlin.

Jetpack Compose

Modern declarative UI toolkit for Android. Speeds up interface development and aligns with current Google best practice for new products.

Android Studio

Official IDE for Android app development, emulators, performance profiling, and building release APKs and App Bundles for Google Play.

Google Play Console

Publishing, staged rollouts, internal and closed testing tracks, store listing management, and compliance with Google Play policies.

Android platform APIs

FCM push notifications, Google Sign-In, Maps, location services, NFC, biometrics, background tasks, and device-specific optimisations across manufacturers.

Cross-platform mobile app development

Cross-platform development lets you ship iOS and Android from a shared codebase, reducing cost and time to market. We use cross-platform tools when they match product goals, not as a default for every project.

React Native

JavaScript and React-based framework for iOS and Android from one codebase. Strong when you already have web React skills or need fast iteration with native module extensions.

Expo

React Native toolchain for rapid prototyping, over-the-air updates, and streamlined builds. Useful for MVPs and products that need frequent release cycles.

Flutter

Google's Dart-based UI toolkit compiling to native ARM code. Delivers consistent design across iOS and Android with strong animation and custom UI performance.

Progressive Web Apps (PWA)

Web apps that install to the home screen and work offline. A practical option when app store distribution is not required and you want one codebase for web and mobile web.

Capacitor & hybrid shells

Wrap existing web applications in a native container for App Store and Play distribution when a full native rewrite is not yet justified.

Native vs cross-platform advice

We help you decide based on performance needs, device API usage, team skills, budget, and long-term maintenance, not framework hype.

Types of mobile apps we build

Mobile app development covers a wide range of products. These are common app types and use cases we deliver for UK businesses.

B2C consumer apps

Customer-facing iPhone and Android apps for engagement, loyalty, content, subscriptions, and direct-to-consumer services.

B2B & enterprise apps

Internal tools, sales apps, partner portals, and workforce apps with role-based access, SSO, and integration into CRM and ERP systems.

SaaS companion apps

Mobile clients for web platforms: dashboards, notifications, approvals, and on-the-go access to core SaaS functionality.

E-commerce & marketplace apps

Product catalogues, baskets, checkout, order tracking, and seller or vendor flows connected to payment gateways and inventory systems.

Fintech & payment apps

Secure payment flows, wallets, donations, subscriptions, and financial products. Experience integrating 50+ payment providers and gateways.

Healthcare & regulated apps

Patient-facing and clinician tools with attention to data privacy, secure auth, audit trails, and UK GDPR compliance.

Field service & logistics apps

Offline-capable apps for engineers, drivers, and field teams: job sheets, GPS, photo capture, signatures, and sync when connectivity returns.

MVP & startup apps

Minimum viable products to test ideas, pitch investors, and learn from real users before committing to full-scale native builds.

App rebuilds & modernisation

Replacing outdated apps, migrating from legacy frameworks, and improving performance, security, and App Store compliance on existing products.

Mobile app features & integrations

Modern mobile apps rarely stand alone. We implement the device capabilities, third-party services, and backend connections your product needs.

Push notifications

Apple Push Notification service (APNs) and Firebase Cloud Messaging (FCM) for re-engagement, alerts, and transactional messages.

Offline & sync

Local storage, background sync, and conflict handling so apps keep working with poor or intermittent mobile connectivity.

Biometric authentication

Face ID, Touch ID, and Android fingerprint login for fast, secure access without repeated password entry.

Mobile payments

Stripe, Apple Pay, Google Pay, in-app purchases, subscriptions, and custom checkout flows integrated with your backend.

Maps & location

Google Maps, Apple Maps, geolocation, geofencing, route tracking, and location-aware features for delivery and field use cases.

Camera & media

Photo and video capture, document scanning, image upload, compression, and gallery integration for proof-of-work and user-generated content.

Bluetooth & device hardware

Connections to peripherals, IoT devices, printers, and specialist hardware where the product requires direct device communication.

Deep linking & universal links

Open specific app screens from email, SMS, web, and marketing campaigns. Supports onboarding, referrals, and recovery flows.

Analytics & crash reporting

Firebase Analytics, Mixpanel, Sentry, and similar tools to understand behaviour, measure funnels, and fix production issues quickly.

Chat & real-time

In-app messaging, live updates, and websocket or Firebase-backed real-time features for support and collaboration products.

Backend, APIs & cloud for mobile

A mobile app is only as good as the systems behind it. We build and integrate the APIs, auth, and infrastructure your app depends on.

REST & GraphQL APIs

Secure, versioned APIs designed for mobile clients: pagination, caching headers, and payloads optimised for slower networks.

Firebase & BaaS

Authentication, Firestore, Cloud Functions, and hosting for products that need to move quickly without building every backend component from scratch.

Custom backend development

Node.js, Python, Laravel, and other server-side stacks when you need full control, complex business logic, or enterprise integrations.

Authentication & SSO

Email login, OAuth, SAML, Microsoft Entra, Okta, and multi-factor authentication for consumer and workforce apps.

AWS, GCP & Azure

Cloud hosting, serverless, containers, and managed databases aligned with your existing infrastructure and compliance needs.

CRM & third-party integrations

Salesforce, HubSpot, ERP, marketing tools, and webhooks so mobile data flows into the systems your business already runs on.

Mobile design, UX & performance

App store ratings and retention depend on how an app feels, not just what it does. We design mobile experiences that convert and perform.

Mobile-first UX design

Touch-friendly layouts, thumb-zone navigation, clear onboarding, and flows designed to reduce drop-off on small screens.

UI design & prototyping

Wireframes, clickable prototypes, and high-fidelity screens in Figma before development to validate ideas early.

Accessibility

VoiceOver, TalkBack, dynamic type, colour contrast, and inclusive design so apps work for the widest possible audience.

App performance optimisation

Fast launch times, smooth scrolling, efficient memory use, and battery-conscious background behaviour on real devices.

Conversion-focused flows

Signup, checkout, donation, and subscription journeys optimised from experience processing tens of millions of transactions.

App store creative

Screenshots, preview videos, and listing copy guidance to improve discovery and install rates on the App Store and Google Play.

App Store & Google Play publishing

Getting an app live involves more than writing code. We handle submission, compliance, and release management for both major stores.

Apple App Store submission

App review preparation, privacy nutrition labels, entitlement setup, and resolving common rejection reasons before submission.

Google Play submission

Play Console setup, App Bundle builds, content rating questionnaires, and data safety declarations required for publication.

TestFlight & beta testing

Internal and external beta programmes on iOS and Android to gather feedback before public release.

App Store Optimisation (ASO)

Keyword research, title and description optimisation, and localisation to improve visibility for relevant mobile app search terms.

Release management

Staged rollouts, version numbering, release notes, and coordination between mobile and backend deployments.

Enterprise & private distribution

Apple Business Manager, MDM deployment, and internal app distribution for workforce tools outside public stores.

Mobile app security & compliance

Secure data storage

Keychain, encrypted local storage, and secure handling of tokens and sensitive user data on device.

UK GDPR & privacy

Privacy policies, consent flows, data minimisation, and app privacy disclosures aligned with UK and EU requirements.

API & transport security

TLS, certificate pinning where appropriate, OAuth 2.0, and protection against common mobile API vulnerabilities.

Penetration testing support

Remediation of findings from security audits. Works alongside our security service for broader assessments.

Ongoing support, updates & maintenance

Mobile apps need continuous care: OS updates, store policy changes, bug fixes, and new features. We provide long-term mobile app support, not just launch-day delivery.

iOS & Android OS updates

Keeping apps compatible with new iPhone, iPad, and Android versions, SDK requirements, and deprecated API migrations.

Bug fixes & monitoring

Crash triage, production issue response, and proactive monitoring so problems are caught before users churn.

Feature development

Roadmap delivery after launch: new screens, integrations, and improvements based on analytics and user feedback.

App transfer & handover

Documentation, repository access, and clean handover when you need to bring mobile development in-house or change partners.

Mobile app development search terms

Businesses search for mobile app help in many ways. We work on projects matching terms such as:

  • Mobile app development UK
  • Mobile app development Berkshire
  • Mobile app development Newbury
  • App development agency UK
  • Custom mobile app development
  • iOS app development
  • Android app development
  • iPhone app developer
  • Android app developer
  • Native app development
  • Cross-platform app development
  • React Native app development
  • Flutter app development
  • Build a mobile app for my business
  • Mobile app development company
  • Enterprise mobile app development
  • B2B mobile app development
  • Mobile app MVP development
  • App Store submission help
  • Google Play app publishing
  • Mobile app maintenance and support
  • Mobile app backend development
  • API development for mobile apps
  • Mobile app design and development
  • Rebuild my mobile app

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Ready to build your mobile app?

From MVP to enterprise rollout, we help you plan, design, build, publish, and support iOS and Android apps that fit your product and your business.

Got a project?