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Cross-Platform App Development - JW Digital

Cross-Platform App Development

“Build once, launch everywhere. JW Digital’s cross-platform app development combines React Native and Expo to create fast, secure apps that run seamlessly on iOS, Android, and the web — all from a single codebase.” — Janusz Wozniak

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Cross-Platform App Development — One Codebase, Native Quality

React Native and Expo builds that target iOS, Android, and the web from a single codebase — without sacrificing the performance and platform feel users expect.

Cross-platform done badly produces apps that feel generic on every platform. Cross-platform done well delivers shared business logic, faster iteration, and a meaningful cost saving without the user noticing what's underneath. JW Digital builds React Native and Expo applications with platform-specific UX where it matters, native modules where the JavaScript bridge isn't enough, and a build pipeline that ships to TestFlight, Play Console, and the web from the same source. We help clients understand when cross-platform is the right call — and when one or two genuinely-native components inside it produce a better result than fighting the framework.

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React Native & Expo

Shared React Native codebase covering iOS, Android, and optionally web — with Expo for managed workflow speed or bare React Native where deep native integration is required.

Platform-Specific UX Where It Matters

iOS interactions feel iOS-y, Android feels Android-y. Navigation, gestures, and platform conventions are respected rather than averaged into a lowest-common-denominator design.

Fast Iteration & OTA Updates

Over-the-air updates via Expo Updates or CodePush so you can ship UI and JavaScript changes without a full store review — cutting feedback-to-fix cycles to hours rather than days.

Native Modules Where Needed

Custom native modules in Swift, Kotlin, or Objective-C added when camera, payments, Bluetooth, or platform APIs need real native access — no compromises pretending the JS bridge will do.

Why it matters

Cross-Platform Done Well vs Done Badly — the Difference Is the Choices

Done well, cross-platform delivers genuine cost and speed advantages; done badly, it produces apps that feel generic on every platform

  • 01

    75%

    of users judge a company’s credibility by its website

  • 02

    60%

    of all web traffic comes from mobile devices

  • 03

    3x

    higher conversion rate with modern responsive design

  • 04

    90%

    of buyers visit a company’s website before contacting them

Why you need cross platform app developmentJW Digital
Why you need cross platform app development

The bottom line

The case for cross-platform mobile development is straightforward in principle and easy to get wrong in practice. Shared business logic and UI components across iOS and Android cut development time roughly in half, reduce long-term maintenance cost, and let one team ship to both platforms simultaneously. React Native and Expo have matured to the point where the performance gap to fully-native is invisible to users for the vast majority of apps — particularly with the new architecture (Fabric, TurboModules) that became default in recent React Native releases. The failure mode is what happens when the framework gets fought rather than worked with. Teams that try to force one identical UI onto both iOS and Android produce apps that feel wrong on both — Android users notice the iOS-style back gestures, iOS users notice the material-design ripples. Teams that rely entirely on the JavaScript bridge for camera, Bluetooth, payments, or other platform integrations hit performance and reliability walls that no amount of optimisation can fix. Teams that ignore Expo's managed workflow when it would have served them lose months to native build configuration. Teams that adopt the bare workflow when they didn't need to take on a maintenance burden they didn't budget for. JW Digital builds cross-platform apps with these decisions made explicitly. We respect platform conventions where they matter — iOS interactions feel iOS-y, Android feels Android-y, gestures and navigation work the way users on each platform expect. We add native Swift or Kotlin modules where the JavaScript bridge isn't enough rather than pretending it always is. We pick Expo's managed workflow when it serves the project and bare React Native when it doesn't. And we tell you honestly when the right answer is a fully-native build — usually for deep AR/VR, complex Bluetooth peripherals, or platform-specific monetisation requirements — rather than forcing cross-platform because that's what we sell.

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What's Included

What's Included in Cross-Platform App Development

Engineering discipline applied to the framework decisions — not just the code

1

Platform Strategy & Stack Documentation

Documented decisions covering Expo managed vs bare, native module requirements, shared vs platform-specific UI components, and integration approach — agreed before development begins.

2

Platform-Aware Design System

Figma design system with explicit iOS/Android variants where platform conventions matter — navigation, gestures, and interactions respect each platform's users rather than averaging into a generic compromise.

3

Shared React Native Codebase with Native Modules

TypeScript-based shared codebase for business logic and most UI, with native Swift or Kotlin modules where camera, payments, Bluetooth, secure enclave, or platform APIs need genuine native access.

4

OTA Updates & CI/CD Pipeline

Expo Updates or CodePush configured for over-the-air JavaScript and asset updates; EAS Build or GitHub Actions for iOS and Android binaries from the same source; staging and production environments for proper release management.

5

Real-Device Testing & Performance Profiling

Testing on real iOS and Android devices across supported OS versions, performance profiling for 60fps animations and list rendering, and platform-specific UX polish before submission.

6

Store Submission, Crash Tracking & Handover

App Store and Play Console submission end-to-end (provisioning, signing, privacy disclosures, store listings), Sentry or Crashlytics configured properly, documented handover with codebase, deployment runbooks, and architecture notes.

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Our Process

Our Cross-Platform App Development Process

Platform-aware design, native modules where required, and a build pipeline that ships everywhere from one source

  1. 1

    Strategy, Platform Targeting & Stack Selection

    We agree the target platforms (iOS, Android, web), the framework strategy (Expo managed, Expo bare, or pure React Native), and the integrations that will require native modules versus those that can stay JavaScript-only. The decisions are documented with reasoning before any code is written.

  2. 2

    Design System & Platform-Aware UX

    A Figma design system with components, tokens, and states — designed once, with explicit iOS/Android variants where platform conventions matter. Navigation, gestures, and interactions respect platform users' expectations rather than averaging into a lowest-common-denominator design.

  3. 3

    Shared Codebase Build with Native Module Integration

    React Native with TypeScript for the shared business logic and UI layer. Native Swift, Kotlin, or Objective-C modules added where camera, payments, Bluetooth, secure enclave, or platform APIs need genuine native access — not faked through a brittle JavaScript bridge.

  4. 4

    OTA Update Pipeline & CI/CD

    Over-the-air update pipeline via Expo Updates or CodePush configured during the build — so UI and JavaScript changes ship in hours, not weeks. CI/CD via EAS Build or GitHub Actions handles iOS and Android binaries from the same source, with staging and production environments for proper release management.

  5. 5

    Real-Device Testing & Performance Tuning

    Testing on real iOS and Android devices across the OS versions your audience uses — not just simulators. Performance profiling for 60fps animations, optimised list rendering, careful image and font handling, and platform-specific UX polish before submission.

  6. 6

    Store Submission & Post-Launch Operations

    Provisioning profiles, signing, App Store Connect and Play Console setup, privacy manifests, data safety declarations, screenshots, and store listing copy. Post-launch monitoring via Sentry or Crashlytics, with our app maintenance and support service available on retainer for ongoing OS compatibility, dependency patching, and analytics-informed iteration.

Our web design process - JW Digital
Our web design process - JW Digital
Our Pricing

Cross-Platform App Development Pricing

Cross-platform pricing typically falls 30-50% below building separate native iOS and Android apps for comparable scope — though the savings depend on how much native module work the integrations require. A focused MVP covering iOS and Android with core flows and limited backend typically falls between £1,500 and £6,000. A full production app with custom backend, multiple integrations, design system, and store submission handled typically falls between £6,000 and £25,000. We produce a written scope and fixed quote against agreed deliverables. Cross-platform work pairs naturally with our app API and backend integration, app UI/UX design, app maintenance and support, and database and API development services for end-to-end delivery.

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  • Single codebase for iOS, Android & web
  • Reduced development costs
  • Consistent design & UX
  • App Store & Play Store deployment
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Once you have a rough estimate, you can use it as a starting point for your project planning. If you need something more tailored, JW Digital can then provide a bespoke quote based on your exact goals and requirements.

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Mobile App Development - JW Digital

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iOS and Android apps built for performance and growth

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From £1,200

Progressive Web App Development - JW Digital

Progressive Web App (PWA) Development

Web apps that look and feel like native apps

PWAs combine the best of web and mobile. JW Digital builds fast, installable, and offline-ready Progressive Web Apps that work seamlessly across devices — without App Store restrictions.

From £1,000

App UI/UX Design - JW Digital

App UI/UX Design

Human-centered design that delights users

JW Digital designs intuitive, beautiful app interfaces that enhance usability and engagement. From wireframes to full prototypes, we make sure every interaction feels natural and impactful.

From £500

Specialist Services

Related Digital Services

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Bespoke Website Design

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Cross-Platform Mobile Apps — Done the Way They Should Be Done

Get a cross-platform app project from JW Digital. We pick the right framework, respect platform conventions, add native modules where they matter, and ship from one codebase to iOS, Android, and beyond.

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Recent Projects

Recent App Development Projects

Explore some of the mobile apps, SaaS platforms, and Progressive Web Apps JW Digital has built for UK startups, SMEs, and enterprises.

Browse a selection of our recent web design and development projects for businesses across a range of industries, including healthcare, construction, hospitality, trade services, recruitment, and professional services. Each project is designed to balance performance, usability, branding, and SEO foundations.
Challenge Yourself — Fitness PWA Web Application project for Health & Fitness business in UK

Challenge Yourself — Fitness PWA

Web Application

Progressive web app for structured fitness transformation: 12-week training programmes, personalised workout execution, progress tracking, and integrated coaching.

Industry:

Health & Fitness

Location:

UK

Project Type:

Web Application Development

Technologies

Next.js
PWA
TypeScript
+1
View Project
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Frequently Asked Questions

Most Asked Questions

FAQs

Common questions about mobile and cross-platform app development, SaaS platforms, PWAs, UI/UX, backend integration, and ongoing app maintenance with JW Digital.

Illustration representing frequently asked questions

React Native is our default and the best fit for most cross-platform projects — mature ecosystem, strong native module support, excellent developer experience with TypeScript, and shared technology with web React projects. Flutter is a credible alternative if the team already knows Dart and the UI is heavily custom. Fully-native Swift and Kotlin is the right call when one platform dominates your audience, when deep AR/VR or complex Bluetooth peripherals are central to the product, or when the team has strong existing native expertise. We give the recommendation that fits your product, not the one that maximises billable hours.

For the vast majority of products, yes. Modern React Native (with the new architecture — Fabric and TurboModules) delivers smooth 60fps animations, fast list rendering with FlashList, and platform-API access that is invisibly different to users. The performance gap shows up in genuinely demanding scenarios — high-performance games, complex AR/VR, real-time video processing — where fully-native is usually the right answer anyway. For business apps, eCommerce apps, SaaS clients, social and messaging apps, and most everything else, performance is not a meaningful differentiator.

Yes. The shared codebase produces both iOS and Android binaries via EAS Build, GitHub Actions, or your preferred CI/CD. The build pipeline handles platform-specific signing, provisioning, and store submission. UI and JavaScript changes can also ship via over-the-air updates (Expo Updates or CodePush) without requiring a full store review — significantly faster iteration than fully-native development.

Where the use case justifies it, offline-first architecture is built in from the start — local caching with AsyncStorage or MMKV, queued mutations that sync on reconnect, conflict resolution patterns, and clear UI states for offline conditions. For mostly-online products, we still cache critical content so the app degrades gracefully on slow networks rather than failing entirely.

Yes. We integrate Stripe, Firebase, OneSignal, Pusher, third-party CRMs, analytics platforms, and any other service your app needs. Where you have an existing backend, we integrate cleanly with it. Where you need a custom backend built, we deliver it via our app API and backend integration and database and API development services.

Sometimes, depending on the project. React Native for Web is mature enough for product surfaces where the web experience can share most components — particularly admin dashboards, SaaS interfaces, and content-driven apps. For marketing websites and SEO-driven content, a separate Next.js website is usually the better choice and pairs naturally with our bespoke website design service. We are explicit during scoping about which approach fits your product.

Platform-aware design and engineering. iOS navigation typically uses bottom tabs and modal sheets where Android uses drawer or rail navigation. Material Design ripples differ from iOS press states. Permissions UX is platform-specific. Push notification handling is APNs versus FCM. We respect these differences rather than averaging them, with explicit platform-specific code paths where they matter and shared code where they don't.

React Native releases major versions roughly every 6 months and minor versions more frequently; dependencies update continuously; iOS and Android ship breaking changes annually. Our app maintenance and support retainers handle dependency updates with regression testing, OS compatibility on every major release, store policy compliance updates, and the analytics-informed iteration that turns a shipped app into a successful one.

When the product depends on deep ARKit/ARCore integration, complex Bluetooth peripheral protocols, real-time video processing, advanced gaming graphics, or platform-specific monetisation (Apple-only In-App Purchases with intricate subscription logic that React Native's bridges handle awkwardly). When the team has strong existing native expertise that would be wasted on a framework change. When one platform genuinely dominates your audience to the point where the other isn't worth shipping at all. We are explicit about these cases during scoping.