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Neutrons Agency LLC — a US-registered performance marketing agency and software house. We turn your ideas into working software and drive consistent, measurable growth.

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Mobile App Development Agency

Custom mobile apps your users will love

We design, build and launch fast, scalable iOS and Android apps — native and cross-platform with Flutter and React Native — from a lean MVP to a full-scale product that grows your business.

  • Custom iOS & Android apps built to scale
  • Native-quality performance, cross-platform speed
  • From MVP to App Store launch & support
★★★★★
5.0 RatingTrusted by startups & brands
Custom iOS and Android mobile app development by Neutrons

80+

Mobile apps shipped

Mobile App Development
iOS App Development
Android App Development
Flutter
React Native
Cross-Platform Apps
App UI/UX Design
MVP Development
App Store Launch
App Maintenance
Custom mobile app design tailored to your business
Custom Mobile App Development

Mobile apps built to launch, scale & retain

Every app we build starts with your users and your goals. Our mobile developers craft intuitive, high-performance iOS and Android apps with clean, scalable code — so you launch faster, delight users and grow without limits.

  • Tailor-made iOS & Android apps for your business
  • Native-quality performance on every device
  • Intuitive, conversion-focused user experience
  • Secure, scalable architecture built to grow
  • Clear roadmap from MVP to full launch
Our Mobile App Services

Everything you need to launch & grow your app

Custom Mobile App Development icon

Custom Mobile App Development

Bespoke iOS and Android apps built from scratch around your business — scalable architecture, clean code and a polished experience your users will love.

iOSAndroidCustom build
Cross-Platform App Development icon

Cross-Platform App Development

One codebase, both platforms. We build fast, native-feeling apps with Flutter and React Native so you launch on iOS and Android sooner and for less.

FlutterReact NativeOne codebase
App UI/UX Design & Prototyping icon

App UI/UX Design & Prototyping

Intuitive, conversion-focused mobile UI/UX design and interactive prototypes — validated with users before development so your app feels effortless.

UI/UXPrototypingUser testing
Backend, APIs & Integrations icon

Backend, APIs & Integrations

Secure, scalable backends, REST/GraphQL APIs and third-party integrations — payments, maps, push notifications, auth and analytics wired in cleanly.

APIsAuthPayments
App Store Launch & ASO icon

App Store Launch & ASO

We handle App Store and Google Play submission, App Store Optimization and analytics setup so your app launches smoothly and gets found and downloaded.

App StoreGoogle PlayASO
App Maintenance & Support icon

App Maintenance & Support

Ongoing updates, OS compatibility, monitoring, new features and crash fixes so your mobile app stays fast, secure and reliable long after launch.

UpdatesMonitoringSupport

Why our mobile apps win

  • Native iOS & Android app development
  • Cross-platform apps with Flutter & React Native
  • Conversion-focused mobile UI/UX design
  • Scalable, secure backends & APIs
  • Offline-first & real-time functionality
  • Push notifications & in-app messaging
  • Payments, subscriptions & in-app purchases
  • App Store & Google Play launch support
  • App Store Optimization (ASO)
  • Analytics, crash reporting & monitoring
  • MVP development for startups
  • Transparent fixed-price quotes
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Mobile app maintenance, updates and support services
App Maintenance & Support

Keep your app fast, secure & always up to date

Launch is just the beginning. Our app care plans handle OS updates, new features, monitoring and crash fixes — so you can focus on growth while we keep your iOS and Android app fast, secure and reliable for every user.

  • iOS & Android OS update compatibility
  • New features & continuous improvements
  • Performance monitoring & crash fixes
  • Security patches & dependency updates
  • App Store & Play Store release management
How We Work

Our mobile app development process

01

Discovery & Strategy

We define your app's goals, users and feature set, and map a roadmap from MVP to full launch.

02

UI/UX Design & Prototype

We design an intuitive, on-brand interface and interactive prototype for your approval before development.

03

Development & QA

We build your iOS and Android app with clean code, integrate your backend and test rigorously on real devices.

04

Launch & Support

We ship to the App Store and Google Play, monitor performance and keep improving your app after launch.

Why Choose Neutrons

A mobile app partner you can count on

From first-time founders to established brands, businesses choose us for our senior mobile developers, transparent pricing and long-term support. We don't just ship apps — we build products your users rely on every day.

  • Dedicated senior mobile app developers
  • 5+ years shipping iOS & Android apps
  • Clean, scalable, well-tested code
  • Fixed pricing with no hidden costs
  • Fast MVP-to-launch delivery
  • Long-term support & partnership
Experienced mobile app developers building an iOS and Android app
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Testimonials

What clients say
about us

My experience with Neutrons Agency has been absolutely outstanding. They have a highly professional and cooperative team that shows great attention to detail, timely delivery, and a deep understanding of digital and technical requirements. The service quality exceeded my expectations, and their support team is always available to answer any questions. I highly recommend working with them for anyone looking for top-notch quality and professionalism.

Badr Eskander

Client

I worked with the company on a custom software project. Masha'Allah, their work is highly professional, and I strongly recommend dealing with them.

Mr. Nabil

Client
Mobile App FAQ

Frequently asked questions

Every app is quoted individually based on features, platforms, integrations and design. We provide a transparent, fixed-price proposal upfront with no hidden costs, and can start with a lean MVP to validate your idea before scaling.

A typical mobile app MVP takes 6–12 weeks from kickoff to launch, depending on complexity. Larger apps with custom backends and integrations take longer. We agree on a clear roadmap during discovery and deliver in milestones.

It depends on your goals. Cross-platform frameworks like Flutter and React Native let you launch on iOS and Android from one codebase, faster and more affordably. For performance-critical apps we also build fully native. We'll recommend the right fit in discovery.

Yes. We develop apps for both iOS (iPhone/iPad) and Android, either natively or cross-platform, and handle submission to both the App Store and Google Play.

Absolutely. We cover the full journey — strategy, UI/UX design, development, backend, QA, App Store and Google Play submission, ASO and post-launch support — so you have one team from idea to launch and beyond.

We offer monthly app care plans covering OS updates, new features, monitoring, crash fixes, security patches and store release management to keep your app fast, secure and reliable.

Ready to turn your idea into a mobile app?

Get a free, no-obligation quote from our mobile app experts today.