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Cross-Platform App Development Agencies

Cross-platform app development agencies delivering Flutter and React Native builds with shared codebases, native performance and one team across iOS and Android.

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200+
Clients
8+
Years Experience
50+
Countries Served
Take off digitally with GreatWorks.

Run smarter, grow faster, and lead the future with advanced technology

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Cross-Platform App Development Agencies

Cross-platform app development agencies delivering Flutter and React Native builds with shared codebases, native performance and one team across iOS and Android.

What We Offer

Our cross-platform app development agencies services cover full-cycle development — from strategy and UI/UX design to development, testing, and deployment — tailored to your industry and business needs.

Dedicated Expert Team

Work with skilled professionals specializing in cross-platform app development agencies. We align our processes for seamless, real-time collaboration with your team.

Proven Delivery

End-to-end cross-platform app development agencies with on-time delivery, transparent processes, and ongoing post-launch support for your business.

Why Choose GreatWorks for Cross-Platform App Development Agencies?

GreatWorks brings global expertise, delivering custom cross-platform app development agencies solutions that are scalable, secure, and built for performance. We work with startups and enterprises alike to turn ideas into high-quality digital products.

Agile Development Process
100% Transparent Communication
Dedicated Project Manager
Post-Launch Support & Maintenance

What We Build

iOS App Development

Native Swift/SwiftUI for iPhone, iPad, watchOS, and App Clips.

Android App Development

Native Kotlin + Jetpack Compose for phones, tablets, and Wear OS.

Cross-Platform (Flutter/RN)

One codebase shipping to iOS, Android, and web — faster and cheaper.

Backend & API Development

Scalable cloud backends, real-time sync, push notifications.

Security & Compliance

Biometric auth, encryption, HIPAA / PCI-DSS-ready architecture.

Maintenance & Growth

OS upgrades, SDK updates, performance tuning, ASO, feature releases.

Our Tech Stack

  • Swift
  • Kotlin
  • Flutter
  • React Native
  • Firebase
  • AWS Amplify
  • Realm
  • GraphQL

Case Studies

Real engagements. Real outcomes. Names withheld under NDA on request.

EdTech Online Learning

Challenge

Wanted one codebase for iOS, Android, web, and Smart TV.

Solution

Flutter app + Flutter Web + dedicated TV player module.

Flutter Flutter Web ExoPlayer Firebase

Results

  • 4 platforms, 1 team
  • Engineering cost down 55%
  • Student engagement up 30%
Logistics Courier Network

Challenge

Driver + branch + admin apps needed in 10 weeks.

Solution

React Native suite with shared offline sync layer.

React Native Realm Mapbox Twilio

Results

  • 3 apps in 10 weeks
  • Delivery SLA up to 96%
  • Branch onboarding time halved
FinTech Crypto Exchange

Challenge

Required matching iOS + Android UI and instant feature parity.

Solution

Flutter app with platform-aware widgets and shared trading engine binding.

Flutter Riverpod gRPC WebSocket

Results

  • Feature parity 100%
  • Order placement latency under 200ms
  • 4.6★ rating

What Clients Say

“One Flutter team gave us four platforms. Our budget conversation is now boring.”

Sarah W.

“They shipped the courier suite in 10 weeks. Operations is the happiest department.”

Arvind K.

“Trading screens identical on both stores, sub-200ms placement. Crypto users notice.”

Hassan E.

Our Process

  1. 1

    Discovery

    Understand goals, audit the current state, and scope the work.

  2. 2

    Design & Planning

    Architecture, UX, and a sprint-by-sprint roadmap.

  3. 3

    Build

    Agile delivery with bi-weekly demos and transparent progress.

  4. 4

    QA & Hardening

    Automated and manual testing, security review, performance tuning.

  5. 5

    Launch & Support

    Go-live, monitoring, and ongoing maintenance.

Industries We Serve

Sector-specific experience delivering Cross-Platform App Development Agencies across regulated and high-growth industries.

FinTech Healthcare Food & Delivery Retail & E-commerce Logistics On-Demand Services
We align technology with your vision.

Finding solutions to complex problems in every sector within days, not years.

Emerging technologies.

Initiate emerging tech solutions to shape a smarter, connected, and innovative future.

How we can support you.

Using effective and powerful sector-specific technology, our experts help you attain your goals.

Healthcare
Education
FinTech
Sports and Media
AI solutions
Political
Energy, Oil and Gas
Retail and E-commerce
Travel and Logistics
Headless commerce

Why choose greatworks?

Delivering innovation, efficiency, and reliability to drive your success. Trust our expertise to build smarter, future-ready solutions.

Expert development team.

Our team has years of industry experience and expertise to deliver high-quality results every time.

Innovative solutions.

We leverage the latest tools, technology, and creative strategies to provide innovative solutions that drive results.

Efficient and punctual.

The development was completed efficiently, balancing both financial constraints and time management.

Product focused and Quality assurance.

Innovation and customer satisfaction with a strong commitment to excellence throughout the product lifecycle.

Speed and Growth.

Provide scalability, flexibility, and rapid deployment while maintaining quality, ensuring timely and high-standard delivery.

Let’s your idea into reality!

Here to assist, whenever you’re ready.

Wherever your journey takes you, we’re here to assist. Want more insights? Ready to start? We've got your back.

Let’s chat

Frequently Asked Questions

Should I build native or cross-platform?

For top performance or platform-deep features, native. For fastest time-to-market across iOS + Android, Flutter or React Native. We recommend during discovery.

How long does a mobile app take?

MVPs: 10–14 weeks. Full production: 16–28 weeks. Replatforms: 12–20 weeks.

Do you handle App Store and Play Store submission?

Yes. We submit, respond to reviewer feedback, and own the process until approval, plus store assets, screenshots, and ASO basics.

Can you support our app after launch?

Yes — monthly retainers cover crash monitoring, OS-version compatibility, SDK upgrades, and feature releases.

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