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One codebase · Two app stores

Cross-platform app development for iOS and Android, from one codebase.

Ship your app to both stores at the same time, keep one team and one codebase, and cut maintenance work. We build cross-platform apps in Flutter and React Native that feel native on every phone.

  • Free 30-minute consultation
  • NDA on request
  • Clear fixed quote
0+Years of experience
0+Projects delivered
0Countries served
0 minFree discovery call
Why cross-platform

Two platforms, half the work.

Building separate native apps means two codebases, two teams and two release schedules. Cross-platform development lets most of your code, business logic and design system run on both iOS and Android, so new features reach every user at once.

We choose the framework that fits your product: Flutter for design-heavy apps that need pixel-perfect UI and smooth animation, React Native when you want to share skills or code with a React website. Where a feature needs native power, such as Bluetooth, background location or payments SDKs, we write native modules in Swift or Kotlin.

Faster time to market

Launch on both stores together instead of one after the other.

One codebase

Most code is shared, so fixes and features ship once.

Lower maintenance

One team, one release pipeline and simpler updates.

Native when needed

Custom modules for hardware, payments and OS features.

Our services

Cross-platform app development services.

From a first MVP to rebuilding two native apps into one modern codebase.

💙

Flutter app development

Fast, beautiful apps with one Dart codebase and a consistent design on every device.

⚛️

React Native app development

TypeScript apps that can share logic and talent with your React web product.

🔄

Native-to-cross-platform migration

Rebuild separate iOS and Android apps into one maintainable codebase, screen by screen.

🧩

Native modules & SDKs

Swift and Kotlin bridges for payments, maps, Bluetooth, health data and custom hardware.

🖥️

Web & desktop from the same code

Extend your app to web, Windows or macOS where the framework supports it.

🧪

Automated testing & CI/CD

Unit, widget and end-to-end tests with automated builds to both stores.

What we build

Cross-platform apps, built the right way.

One codebase is only a saving if it's well architected. Here's what each type of cross-platform build includes.

Flutter for custom UI and consistent design

Flutter draws every pixel itself, so your app looks identical on every device. It's our first choice for brand-heavy apps, dashboards and products that also need a web or desktop version.

What you get

  • Custom design system built in Flutter widgets
  • Smooth 60–120 fps animations
  • iOS, Android, web and desktop from one codebase
  • Riverpod or BLoC state management
  • Platform channels for native SDKs
  • Golden tests to catch UI changes

Technology

FlutterDartRiverpodBLoCDioHiveFirebaseCodemagic
Example use case

Fitness subscription app

Problem
A studio chain needed the same branded app on iPhone, Android and a web portal.
Our solution
A Flutter app with class booking, video workouts and in-app subscriptions, plus a Flutter web member portal.
Expected outcome
One codebase to update for all platforms, with a consistent brand everywhere.

React Native for teams already using React

If your web product runs on React, React Native lets your team share logic, tools and developers. With the new architecture, performance is strong for most business apps.

What you get

  • TypeScript codebase with shared logic from your web app
  • Native UI components for a platform-native feel
  • Expo or bare workflow, depending on native needs
  • Over-the-air updates with EAS Update
  • Detox end-to-end tests
  • Monitoring with Sentry

Technology

React NativeTypeScriptExpoEASReact QueryZustandReanimatedSentry
Example use case

SaaS companion app

Problem
A B2B SaaS company's customers wanted mobile access to their dashboard.
Our solution
A React Native app reusing the web app's API client and business logic, with push alerts for key events.
Expected outcome
Mobile launched with the existing React team, without hiring separate iOS and Android developers.

Shared logic, fully native UI

For apps that need a truly native interface but want to share business logic, Kotlin Multiplatform shares networking, data and rules while keeping SwiftUI and Jetpack Compose screens.

What you get

  • Shared Kotlin module for business logic and data
  • Native SwiftUI and Compose interfaces
  • Gradual adoption inside existing native apps
  • Shared unit tests across platforms
  • Ktor networking and SQLDelight storage

Technology

Kotlin MultiplatformCompose MultiplatformSwiftUIKtorSQLDelightKoin
Example use case

Banking app modernisation

Problem
A financial services app had two native codebases with logic that often drifted apart.
Our solution
Shared Kotlin modules for calculations, validation and API calls, used by both native apps.
Expected outcome
One source of truth for business rules and fewer platform-specific bugs.

Moving from two native apps, or fixing an unstable one

We migrate separate iOS and Android apps to one codebase screen by screen, or rescue cross-platform apps that are slow, crash-prone or stuck on old framework versions.

What you get

  • Code audit and performance profiling
  • Upgrade to current Flutter or React Native versions
  • Incremental screen-by-screen migration
  • Crash and memory leak fixes
  • Automated test coverage for key journeys
  • Release pipeline clean-up

Technology

Flutter DevToolsReact Native New ArchitectureHermesFirebase CrashlyticsFastlane
Example use case

Retail app rescue

Problem
A retailer's React Native app was slow, crashed on older phones and was stuck two major versions behind.
Our solution
Upgrade to the new architecture, list virtualisation, image caching and fixes for the top crashes.
Expected outcome
A noticeably faster app, fewer crashes and a codebase the team can update again.
Who it's for

Where cross-platform works best.

Most business apps get the full benefit of one codebase.

💡MVPs

Startup MVPs

Validate your idea on both stores with one budget, then scale the same codebase as you grow.

  • Launch iOS and Android together
  • Faster iteration from user feedback
  • Easy to add features later
🛒Marketplaces

Marketplaces & on-demand apps

Customer and provider apps that share most features, with real-time updates and payments.

  • Shared chat, booking and payment flows
  • Separate role-based experiences
  • Live tracking via native modules
🏢Internal apps

Business & internal apps

Apps for sales teams, field staff and managers, deployed to company phones on both platforms.

  • Offline-first data sync
  • SSO with Microsoft or Google
  • MDM-friendly distribution
🎬Content

Content & community apps

News, learning, fitness and community apps with feeds, video and subscriptions.

  • In-app purchases on both stores
  • Push notifications and deep links
  • Video and audio streaming
Use cases

When cross-platform is the smart choice.

Common business problems, the solution we build and the outcome it is designed to deliver.

🚀

Launching an MVP

Problem: You need iOS and Android quickly on a limited budget.

Solution: One Flutter or React Native codebase with a lean feature set.

Result: Both stores launched faster, with budget left for growth.

🧩

Two apps drifting apart

Problem: Separate iOS and Android teams ship features at different times.

Solution: Merge into one cross-platform codebase.

Result: Features ship to everyone at the same time.

🖥️

Mobile plus web

Problem: You need an app and a web portal with the same look.

Solution: Flutter for mobile and web, or React Native with React web sharing logic.

Result: Less duplicate work and a consistent brand.

👥

Small in-house team

Problem: You can't hire separate iOS and Android developers.

Solution: A single cross-platform stack your team can learn and own.

Result: Lower hiring cost and easier maintenance.

🔁

Frequent updates

Problem: Your app changes every week based on user feedback.

Solution: CI/CD pipelines and over-the-air updates where allowed.

Result: Faster iteration with fewer manual releases.

🌍

Many markets

Problem: You need multiple languages including Arabic RTL.

Solution: Built-in localisation and RTL support from day one.

Result: One app ready for the Gulf, India and global markets.

Future-ready innovation

End-to-end technology practices.

Most engagements combine three or four practices. A digital transformation project may draw on AI, application development, cloud and security together.

Our process

How we build cross-platform apps.

One process, two store-ready apps.

  1. Week 0–1

    Framework decision

    We compare Flutter and React Native for your features, team and budget.

  2. Week 1–2

    Shared design system

    One set of components that adapts to iOS and Android conventions.

  3. Weeks 2–4

    Architecture

    State management, API layer and native module plan.

  4. Weeks 3+ (2-week sprints)

    Sprint development

    Two-week sprints with builds on both platforms.

  5. Before launch

    Device testing

    Testing across iPhones and a wide range of Android devices and OS versions.

  6. Launch & ongoing

    Dual-store launch

    Simultaneous App Store and Google Play release with monitoring.

Portfolio

Products we design and build.

Food delivery platform built by UD3 Logic – Flutter · Node.js · Maps

Food delivery platform

Flutter · Node.js · Maps
Digital wallet app built by UD3 Logic – React Native · KYC · Security

Digital wallet app

React Native · KYC · Security
Telemedicine app built by UD3 Logic – Flutter · Video · e-Prescriptions

Telemedicine app

Flutter · Video · e-Prescriptions
Fashion e-commerce store built by UD3 Logic – Shopify · Headless · Payments

Fashion e-commerce store

Shopify · Headless · Payments
Logistics & fleet platform built by UD3 Logic – Node.js · Live tracking · IoT

Logistics & fleet platform

Node.js · Live tracking · IoT
Smart farming app built by UD3 Logic – Weather · Crop advisory · Markets

Smart farming app

Weather · Crop advisory · Markets
School ERP built by UD3 Logic – Laravel · React · Parent app

School ERP

Laravel · React · Parent app
Technology stack

Our cross-platform technology stack.

Frameworks

Flutter, React Native, Expo

Languages

Dart, TypeScript, Swift and Kotlin for native modules

State & data

Riverpod, Bloc, Redux Toolkit, React Query

Delivery

Codemagic, Fastlane, GitHub Actions, Sentry

Cost & timeline

Cross-platform app development cost

One codebase usually means a shorter timeline and lower total cost than two native apps. Your fixed quote depends on:

  • Number of screens and user roles
  • Native modules and hardware features
  • Backend and admin panel needs
  • Design and animation complexity
Get your free estimate

Cross-platform MVP

Timeline6–10 weeks

iOS + Android from one codebase, core features, basic admin, store launch.

Business app with backend

Most popular
Timeline10–14 weeks

Custom backend, payments, notifications, analytics and admin dashboard.

Mobile + web from one codebase

Timeline12–18 weeks

Flutter mobile and web, or React Native with shared React web logic.

Native-to-cross-platform migration

Timeline8–20 weeks

Audit, incremental migration and feature parity with your current apps.

Upgrade & performance rescue

Timeline2–6 weeks

Framework upgrade, crash fixes, speed optimisation and tests.

Every project is different. Book a free 30-minute call and get a clear, itemised quote with milestone-based payments.

Engagement models

Six ways to work with us.

Pick the model that fits your budget, timeline and team, and switch as the project grows.

01

Discovery & prototype sprint

Best for
Validating an idea before full investment
Duration
2–3 weeks
Team
Analyst, designer, architect
Pricing
Fixed fee
02

Fixed-scope project

Best for
Clear requirements and a defined launch date
Duration
6–20 weeks
Team
Full project team
Pricing
Milestone payments
03

Dedicated team

Best for
Ongoing product development with changing priorities
Duration
3 months+
Team
2–8 engineers + PM
Pricing
Monthly per team
04

Hire developers

Best for
Adding skills to your in-house team quickly
Duration
1 month+
Team
1 or more developers
Pricing
Monthly per developer
05

Long-term product partnership

Best for
Roadmap ownership from launch to scale
Duration
12 months+
Team
Cross-functional pod
Pricing
Monthly retainer
06

Support & maintenance

Best for
Keeping a live product secure, fast and updated
Duration
Ongoing
Team
Support engineers
Pricing
Monthly plan with SLA
Our commitments

Eight promises we put in writing.

What working with UD3 Logic looks like compared with a typical vendor.

  1. 01

    One accountable partner

    With UD3 LogicDesign, development, QA, cloud and support under one roof, with one project lead you can call.
    Typical vendorSeveral freelancers or vendors, and no single owner when something breaks.
  2. 02

    NDA first

    With UD3 LogicWe sign an NDA before you share detailed plans or data.
    Typical vendorIdeas and documents shared before any agreement is in place.
  3. 03

    You own everything

    With UD3 LogicFull source code, designs, accounts and IP are transferred to you, in your repositories.
    Typical vendorCode held on the vendor's servers, with hand-over fees or lock-in.
  4. 04

    Design before code

    With UD3 LogicClickable prototypes approved by you before development starts.
    Typical vendorDevelopment starts from a document, and surprises appear at the end.
  5. 05

    Weekly demos

    With UD3 LogicWorking software every week or every sprint, on a test link you can try.
    Typical vendorLong silences, then a big reveal near the deadline.
  6. 06

    Milestone payments

    With UD3 LogicPay against agreed deliverables, not upfront for the whole project.
    Typical vendorLarge advance payments with little visibility.
  7. 07

    Quality built in

    With UD3 LogicCode reviews, automated tests and security checks in every sprint.
    Typical vendorTesting squeezed in after development, if at all.
  8. 08

    Support after launch

    With UD3 LogicFree 30-day warranty period, then flexible maintenance plans.
    Typical vendorThe team moves on and bug fixes become new paid projects.
Why businesses choose us

More than development. A product partner built for growth.

Experienced developers, modern technology and quality assurance for faster execution with fewer surprises.

01
Product thinking

We solve the right problem before writing the first line of code.

We align business goals, user needs, priorities and technical direction before development begins, so every feature has a clear purpose.

02
Architecture

Built to handle today and designed for what comes next.

Modular, scalable foundations that support more users, new features and integrations without forcing expensive rebuilds later.

03
Security by design

Security is built into the product, not added at the end.

Data protection, access control, API architecture and secure development practices are treated as a core part of the product.

04
Transparent execution

You always know what is being built, why it matters and what comes next.

Clear milestones, regular reviews and honest communication keep your team aligned and remove unnecessary surprises.

05
Continuous support

Launch is not the finish line. It is the start of the next growth stage.

We stay involved with optimisation, maintenance, enhancements and scaling so your product keeps evolving with the business.

Case studies

How we solve real business problems.

Each case study shows the challenge, what we built and the technology behind it.

On-demand food delivery platform – UD3 Logic case study
Sample – replace with a real client project
UAEFlutterNode.js

On-demand food delivery platform

The challenge
A restaurant group needed its own ordering channel instead of paying high aggregator commissions.
What we built
Customer, rider and restaurant apps in Flutter with live tracking, Arabic/English UI and a web admin panel.
Tech stack
Flutter, Node.js, Firebase, Google Maps
Discuss a similar project
Digital wallet for a lending startup – UD3 Logic case study
Sample – replace with a real client project
IndiaReact NativeUPI

Digital wallet for a lending startup

The challenge
Users dropped off during a slow, paper-based KYC process.
What we built
A React Native wallet with video KYC, UPI payments, biometric login and an EMI dashboard.
Tech stack
React Native, UPI, AWS, Biometrics
Discuss a similar project
Industries

Deep experience across business verticals.

🏥

Healthcare

Telemedicine, clinic and lab software, patient apps and HIPAA/ABDM-aware data handling.

TelehealthEMRPharmacy
🎓

Education

School ERP, LMS, online classes, fee collection and parent-teacher apps.

School ERPLMSEdTech
🛍️

Retail & E-commerce

Online stores, marketplaces, POS integrations and loyalty programmes.

D2CMarketplacePOS
🏦

Finance & FinTech

Wallets, lending, payments and investment platforms with strong security.

WalletsLendingKYC
🚚

Logistics & Transport

Fleet tracking, delivery apps, shipping portals and warehouse systems.

FleetTMSDelivery
🏨

Travel & Hospitality

Hotel booking, property management, tours and restaurant ordering.

BookingPMSF&B
🏠

Real Estate

Property portals, CRM for brokers, virtual tours and rental management.

PortalsCRMRentals
🏭

Manufacturing & Energy

Production tracking, maintenance, IoT dashboards and oil & gas field apps.

IoTERPField apps
Trends for 2026

Cross-platform trends in 2026.

01

React Native's new architecture

Fabric and TurboModules are now the default, bringing faster startup and smoother lists.

02

Flutter on web and desktop

More companies ship one Flutter codebase to mobile, web and desktop for internal tools.

03

Kotlin Multiplatform growth

Teams that want native UI increasingly share business logic with KMP instead of rewriting it.

04

Expo for production

Expo's build and update services make React Native releases faster and more reliable.

05

Design tokens across platforms

Shared design systems keep mobile, web and marketing sites visually consistent.

06

AI coding with human review

AI assistants speed up boilerplate, while senior developers still own architecture and code review.

Where we work

Cross-Platform App Development for clients across 10 countries.

Cross-platform apps make it easier to support multiple markets at once, with shared translations, RTL layouts for Arabic and local payment SDKs added as modules.

US

USA

Stripe and Apple Pay, WCAG accessibility and HIPAA-aware design for health apps; calls in EST, CST or PST hours.

GB

UK

UK GDPR and Data Protection Act 2018 compliant apps, Open Banking-ready FinTech flows and GBP payments.

AE

UAE

Bilingual Arabic/English apps with RTL layouts, UAE PDPL-aware data handling, UAE Pass login and local gateways.

SA

Saudi Arabia

Arabic-first apps with mada and STC Pay, Hijri calendar support and data storage planned for Saudi PDPL rules.

QA

Qatar

Arabic and English apps for Doha businesses, built with Qatar's Law No. 13 of 2016 on personal data in mind.

OM

Oman

RTL Arabic apps for Muscat that follow Oman's Personal Data Protection Law (Royal Decree 6/2022).

AU

Australia

Apps aligned with the Australian Privacy Principles, with Stripe and Afterpay; calls around AEST.

NZ

New Zealand

Apps for Auckland and Wellington that follow the Privacy Act 2020, with Windcave or Stripe payments.

ID

Indonesia

Bahasa Indonesia apps with GoPay, OVO and DANA, tuned for budget Android phones and the PDP Law 27/2022.

IN

India

UPI and Razorpay, Hindi and regional languages, low-bandwidth performance and DPDP Act 2023 alignment.

Client testimonials

What our clients say about us.

"What impressed us most about UD3 Logic was their ability to understand the healthcare industry rather than treating the project like a standard software development assignment. They invested time in learning how our hospital operates, the challenges faced by our staff, and the expectations of our patients before proposing solutions. This resulted in a platform that felt practical and intuitive instead of being overloaded with unnecessary features.

Another standout quality was their willingness to collaborate. They welcomed feedback throughout the project, refined features based on our evolving requirements, and consistently focused on finding the best long-term solution instead of the quickest fix. Their technical expertise, combined with clear communication and genuine commitment to our success, made the entire engagement feel like a true partnership.

Even after the primary development work was completed, they continued to provide valuable support and enhancements, which gave us confidence that the solution would continue to evolve alongside our organization."

ADADPPHHospital · India
Free estimate

Tell us about your Cross-Platform App Development project.

Share a few details. A senior project lead will reply within one working day with questions, a suggested approach and a cost range.

  • NDA available before you share details
  • No obligation, no spam
  • Itemised quote after a free discovery call

Prefer to talk? +91 98874 87026 · sales@ud3logic.com

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FAQ

Cross-Platform App Development FAQs

Detailed answers to the questions clients ask us most before starting a Cross-Platform App Development project.

Still have a question?

Talk to a project lead. We usually reply within one working day.

Ask a question
WhatsApp +91 98874 87026
Q1Is a cross-platform app as fast as a native app?

For most business apps, yes. Flutter compiles to native code and React Native's modern architecture runs smoothly on today's phones. The difference only shows in very graphics-heavy apps such as 3D games or advanced AR, where we would recommend native development.

Q2Flutter or React Native: which should I choose?

Both are excellent. In short:

  • Flutter: best for custom, design-heavy UI and smooth animation, with one Dart codebase.
  • React Native: best when you already use React or TypeScript on the web and want to share code or developers.

We recommend one after looking at your features, team and long-term plans.

Q3How much can I save with cross-platform development?

Because most of the code is shared, you avoid building and maintaining two separate apps. The real saving depends on how many native-only features you need. We show the comparison in your quote so you can decide with real numbers.

Q4Can a cross-platform app use the camera, GPS and Bluetooth?

Yes. Both frameworks have mature plugins for the camera, location, notifications, biometrics and Bluetooth. If a plugin is missing or limited, we write a native module in Swift or Kotlin.

Q5Will my app look like an iPhone app on iOS and an Android app on Android?

It can. We build a shared design system and adapt navigation, gestures, dialogs and typography to each platform's conventions, so users feel at home on both.

Q6Can you convert my existing native apps to Flutter or React Native?

Yes. We usually migrate screen by screen, so your users keep a working app during the transition. We start with the most-used flows and retire the old native code once each part is replaced.

Q7Can the same code also power a web app?

Partly. Flutter can build web and desktop versions, and React Native shares logic with React web apps. For SEO-heavy public websites, we usually recommend a separate web front end that reuses your APIs.

Q8Do you handle app store publishing for both platforms?

Yes. We prepare listings, screenshots and privacy details for both stores, submit the builds and manage the review process for Apple and Google.

Q9What is Kotlin Multiplatform and when should I use it?

Kotlin Multiplatform shares business logic such as networking, data and rules between iOS and Android while keeping fully native screens. It suits teams with existing native apps or apps that need a truly native interface.

Q10Can one cross-platform app support Arabic RTL and English?

Yes. Flutter and React Native both support right-to-left layouts and localisation, so one app can serve Arabic and English users with mirrored screens.

Q11How do you test a cross-platform app on both platforms?

We run automated unit, widget and end-to-end tests in CI, then test on real iPhones and Android phones of different sizes before every release.

Q12Do over-the-air updates break store rules?

Not when used correctly. JavaScript or content changes can be shipped with tools like EAS Update within Apple and Google's guidelines; native changes and new features still go through store review.

Ready to start your Cross-Platform App Development project?

Share your idea and get a clear plan, timeline and quote. The first call is free.