Mobile app development company for iOS and Android apps
NexxusByte designs, builds and launches mobile apps, from MVP to App Store and Google Play release, using native Swift and Kotlin or cross-platform Flutter and React Native.
- Reply within 24 hours
- You own your code
- Senior-led team
Custom mobile app development, from first idea to the app stores
NexxusByte is a mobile app development company that takes you from idea and clickable prototype to a live app on the App Store and Google Play.
We choose the right approach for your goals: native Swift and Kotlin for maximum performance, or Flutter and React Native to reach both platforms faster from one codebase. We recommend launching a focused MVP first to limit cost and learn from real users.
Not sure which to pick? Read native vs cross-platform app development.
What you can expect
- Native and cross-platform options
- Secure login and data handling
- App Store and Google Play launch
- Analytics from day one
Mobile App Development services
Everything included in a NexxusByte engagement, explained.
iOS and Android app development
Native Swift and Kotlin apps when performance, hardware access and platform polish matter most.
Flutter and React Native apps
One shared codebase for both platforms, so you launch faster and maintain a single product.
Mobile app UI/UX design
Interfaces designed around real user journeys, validated with clickable prototypes before development starts.
Back end and API development
Scalable servers, databases, push notifications, payments and third-party integrations that power the app.
Testing and quality assurance
Real-device testing, automated checks and beta releases through TestFlight and Google Play testing tracks.
Maintenance and updates
OS compatibility updates, bug fixes, performance tuning and new features after launch.
Mobile apps we build for different business models
The right app depends on how it creates value. These are the categories we build most often.
Consumer and community apps
Social, fitness, lifestyle and content apps with accounts, feeds, notifications and in-app purchases.
Marketplace and on-demand apps
Ordering, delivery and booking apps with live tracking, payments and separate customer, provider and admin experiences.
Business and enterprise apps
Field-service, sales, inventory and internal tools that connect to your existing systems securely.
Booking and e-commerce apps
Appointment, reservation and shopping apps with secure checkout, loyalty features and push reminders.
Native or cross-platform: we help you choose
We recommend based on your features, budget and timeline, not on what is trendy.
Native iOS (Swift)
Best for performance-critical apps and the newest Apple platform features, with a polished iOS feel.
Native Android (Kotlin)
Best for deep device integration and Android-specific behavior, with long-term stability.
Flutter
One codebase and a consistent, fast UI on iOS and Android, ideal for business apps and MVPs.
React Native
JavaScript-based cross-platform apps that share logic with your web product and move quickly.
Why businesses choose us for mobile app development
MVP-first approach
We help you launch a focused first version quickly, then expand based on real feedback instead of assumptions.
Security by design
Authentication, encryption, secure storage and data-protection requirements are planned from the first sprint.
You own the code
Source code, design assets and developer accounts are handed over to you as part of the project.
Strategy before code
We start with your goals, audience and competitors, so every decision traces back to a business outcome rather than personal taste.
Clear, honest communication
You get a named point of contact, a written plan, regular demos or reports, and plain-English answers, with no jargon and no surprises.
Remote-first, global overlap
We schedule calls around your time zone and work with clients in the USA, UK, UAE, Canada and Australia every week.
Our mobile app development process
A clear path from first call to launch, with checkpoints where you decide.
Discover
We define the problem, the audience and the features that matter most for a first release, and agree success metrics and a realistic scope.
Prototype
Clickable prototypes let you and your users test the experience before development begins, which prevents expensive rework.
Develop and test
Iterative builds with regular demos, real-device testing and beta releases keep quality high and progress visible.
Launch and grow
We handle store submission and review, monitor stability and usage, and plan a roadmap of improvements from real data.
Technologies and tools
- Swift
- Kotlin
- Flutter
- React Native
- Firebase
- REST APIs
- GraphQL
- Figma
Recent projects
Serving businesses in the USA, UK, UAE, Canada and Australia
- United States
- United Kingdom
- United Arab Emirates
- Canada
- Australia
- Remote worldwide
Our mobile app development services are delivered fully remotely by NexxusByte, with overlapping working hours for clients in North America, Europe, the Middle East and Australia, so your project moves forward every day.
More ways we can help you grow
UI/UX & Graphic Design
Research-led interface, website redesign and brand design that makes products clear and easy to use.
Custom Software Development
Tailored web applications, SaaS products and internal tools that fit the way your business works.
Social Media Marketing
Strategy, content and paid campaigns that build your audience and turn followers into customers.
Mobile App Development FAQs
Straight answers to the questions we hear most.
How much does it cost to develop a mobile app?
App cost depends on features, platforms, design complexity and integrations. We start with a discovery phase and give you a fixed-scope estimate for an MVP, so you can launch without overspending.
Should we build a native or cross-platform app?
It depends on your goals, budget and timeline. Cross-platform is usually faster and more economical for business apps; native suits performance-critical or hardware-heavy products. Read native vs cross-platform app development or ask us for a recommendation.
How long does mobile app development take?
A focused MVP typically takes a few months from discovery to store launch. We agree milestones and demo dates in the proposal so you can see progress throughout.
Do you help publish the app to the App Store and Google Play?
Yes. We prepare listings, screenshots and builds, handle submission and respond to review feedback from Apple and Google.
Can you add features to or take over an existing app?
Yes. We start with a technical review of the code base and recommend whether to extend, refactor or rebuild.
Who owns the source code and the developer accounts?
You do. Code and design assets are handed over to you, and we publish through your own Apple and Google developer accounts.
Can the app connect to our website or existing systems?
Yes. We build APIs and integrations to your website, CRM, payment, ERP and other tools. See our custom software development services.
Do you offer app maintenance after launch?
Yes. We provide maintenance plans covering OS updates, bug fixes, monitoring and new features.
Ready to start your mobile app development project?
Tell us about your goals and we will come back with a clear proposal within one working day.