Custom Mobile App Development for iOS, Android and Cross-Platform
ZAPHYRX provides custom mobile app development for startups and growing businesses: product strategy, UX design, native or cross-platform builds, App Store and Google Play launch, and ongoing support.
- 250+ projects delivered
- 120+ businesses served
- Proposal in two business days
Mobile Apps Built for Your Users, Not a Template
Custom app development means designing and building an app around your users, features, and business model instead of adapting a template or white-label product. Your customers get exactly what they need, and nothing that slows them down.
We build on scalable architecture that grows with your user base, and we tune every release for fast launch times, smooth animations, battery efficiency, and reliable performance on real devices and networks. Our mobile app development services cover the full lifecycle:
- Product strategy and MVP scoping
- UX research, wireframes, and clickable prototypes
- Native iOS and Android or cross-platform development
- Backend, APIs, and admin dashboards
- App Store and Google Play submission
- Maintenance, OS updates, and new features
Custom Mobile App Development Services
Our custom mobile app development services cover every major platform. Choose the scope that fits your users and budget, and we’ll recommend the right path during discovery.
iOS App Development
Native iPhone and iPad apps written in Swift and designed to Apple’s Human Interface Guidelines. We integrate features such as Face ID, Apple Pay, push notifications, and widgets, and prepare your app for App Store review.
Android App Development
Native Android apps written in Kotlin that run smoothly across screen sizes and OS versions. We follow Material Design conventions and add features such as Google Pay, background sync, and home-screen widgets.
Cross-Platform App Development
One codebase for iOS and Android, built with Flutter or React Native. Cross-platform development removes duplicate work, keeps both apps in step, and suits most business and consumer apps.
Enterprise Mobile App Development
Secure apps for field teams, operations, and customer service, with single sign-on, role-based access, offline mode, and sync to your back-office systems. We also build healthcare apps and handle fintech app development, where security matters most.
Backend, APIs & Integrations
Every app needs a reliable backend. We build APIs, databases, admin panels, and push-notification services, and connect your app to CRMs, payment gateways, and other tools through our custom software integration services.
App Support & Maintenance
Our mobile app maintenance services keep your app compatible with each new iOS and Android release. We monitor crashes and performance, patch security issues, update dependencies, and ship new features on a schedule you control.
Cross-Platform App Development With Flutter & React Native
Our cross-platform mobile app development services use Flutter or React Native to ship iOS and Android apps from one codebase. Choose native Swift and Kotlin when your app depends on heavy graphics, advanced device hardware, or brand-new platform features. Here’s how the options compare.
| Compare | Native (Swift / Kotlin) | Flutter | React Native |
|---|---|---|---|
| Codebase | Separate iOS and Android apps | One Dart codebase | One JavaScript or TypeScript codebase |
| Performance | Highest, with full hardware access | Near-native, with smooth custom UI | Near-native for most business apps |
| Budget | Highest: two builds to maintain | Lower: one build | Lower: one build |
| Best for | Graphics-heavy apps and advanced device features | Custom-branded interfaces, MVPs, and consumer apps | Teams with React skills, content and commerce apps |
MVP App Development for Startups
An MVP (minimum viable product) is the smallest version of your app that tests your riskiest assumption with real users. As an MVP app development company, we help founders scope the core features, launch, and learn from real usage before investing in a full build.
Not sure your idea is ready? Read our guide on how to validate your app idea before full development. Once the MVP proves demand, the same team scales the product, and our startup digital marketing services help you grow your user base.
- Feature prioritization workshop
- Clickable prototype for user tests and investor demos
- Analytics built in from the first release
Our Mobile App Development Process
Our custom mobile app development process takes your app from idea to the app stores in five phases, with a dedicated project manager and regular demos so you always know where things stand.
01
Discovery & Planning
We study your goals, users, market, and competitors, then define features, platforms, and success metrics. You get a clear roadmap and a written, fixed-scope proposal before design starts.
02
UX/UI Design
Our designers map user flows, then create wireframes and clickable prototypes you can test on a phone. Our mobile app UI/UX design process makes navigation feel effortless and on-brand.
03
Development
We build in focused sprints, with a demo at the end of each one. Front end, backend, and integrations come together in clean code, with analytics and crash reporting included from day one.
04
Quality Assurance & Testing
We test on real iOS and Android devices across screen sizes and OS versions, covering functionality, performance, security, and usability. Issues are found and fixed before your users ever see them.
05
Launch & App Store Approval
We prepare store listings, screenshots, and privacy disclosures, submit to the App Store and Google Play, and handle reviewer feedback. After launch, we keep your app updated, secure, and performing well.
Our Mobile App Development Tech Stack
We choose the stack based on your users, budget, and long-term plans, so your app is fast today and easy to extend later.
iOS
- Swift
- iOS
Android
- Kotlin
- Android
Cross-platform
- Flutter
- Dart
- React Native
Languages
- TypeScript
- JavaScript
Backend & cloud
- Node.js
- PostgreSQL
- MongoDB
- AWS
- Google Cloud
Real-time features
- WebRTC
- Twilio
Design
- Figma
How Much Does Mobile App Development Cost?
The cost of custom mobile app development depends mainly on platforms, features, backend and integrations, design depth, and post-launch support. A focused MVP costs much less than an enterprise app with offline sync and many integrations. Your written proposal spells out the cost and includes a fixed timeline.
Platforms
One cross-platform codebase usually costs less than separate native iOS and Android apps. Adding tablets, wearables, or a web version expands the design and testing scope.
Features & Complexity
Logins, payments, chat, maps, offline mode, and real-time updates each add build and testing time. A tight MVP feature list is the biggest cost lever you control.
Backend & Integrations
Apps that sync with CRMs, ERPs, payment gateways, or legacy databases need more backend work than apps that only read content from a simple API.
Design Depth
Custom animations, a full design system, and several rounds of usability testing raise design cost, but they also reduce expensive rework later in development and after launch.
Ongoing Maintenance
Plan for OS updates, app store policy changes, bug fixes, and new features after launch. Steady maintenance protects your investment and keeps your store ratings healthy.
Why Choose ZAPHYRX as Your Custom Mobile App Development Company
Based in Fairfax, VA, we combine strategy, design, and engineering in one team, so your app is built right and keeps improving after launch.
Native and Cross-Platform Expertise
Our developers build secure, scalable apps in Swift, Kotlin, Flutter, and React Native, so we recommend the approach that fits your app, not the only one we know.
End-to-End Ownership
From idea to launch and maintenance, one team owns your app. A dedicated project manager keeps you informed at every stage, so nothing gets lost between handoffs.
User-Focused Design
We prototype and test key flows with real users before development starts, so the app feels intuitive on day one and needs fewer costly changes after launch.
Smart Technology Choices
We choose frameworks and architecture that limit technical debt, keep infrastructure costs sensible, and leave room for the features on your roadmap for next year and beyond.
Transparent Collaboration
Regular demos, shared boards in Jira, and live design files in Figma let you see progress any day of the week, not only at milestones.
You Own Your App
You own the source code and intellectual property for everything we build. There are no license fees and no lock-in, so you can extend or move your app however you choose.
Our e-commerce app kept crashing and looked messy on some devices. We just wanted something that worked reliably. ZAPHYRX redesigned it and made it feel smooth and simple. Orders have gone up and people aren’t complaining anymore.
We needed a healthcare app but weren’t sure what features to include or how users would navigate it. ZAPHYRX helped us figure out the right flow, and now patients can find what they need without asking for help. It feels so much more organized.
Our event app couldn’t handle many users at once and some parts were confusing. We wanted it to be stable and easy to use. ZAPHYRX rebuilt it, and now it handles peak times without problems and users seem happier using it.
We had an idea for a learning app but no clue how to make it work well on phones. ZAPHYRX walked us through it, gave suggestions, and built an app that our students actually enjoy using. It feels like they really understood what we needed.
What Our App Clients Say
Here’s what businesses we’ve built and rebuilt apps for say about working with ZAPHYRX.
Mobile App Development FAQs
Still deciding? Talk to a strategist at (202) 618 5837 or hello@zaphyrx.com.
How much does mobile app development cost?
Mobile app development cost depends on your platforms, feature list, backend and integrations, design depth, and post-launch support. A focused cross-platform MVP costs far less than separate native apps with complex integrations. After a short discovery call, we send a written, fixed-scope proposal within two business days, so you know the cost and timeline before development starts.
What is mobile app development?
Mobile app development is the process of planning, designing, building, testing, and launching software that runs on smartphones and tablets, typically on iOS and Android. It covers the app itself, the backend and APIs it relies on, app store submission, and ongoing updates as operating systems and user needs change.
How do I choose a mobile app development company?
Choose a mobile app development company with live apps you can download, real experience in both native and cross-platform development, and a clear process from discovery to launch. Ask who owns the code, how testing works, and what support looks like after release. A dedicated project manager and regular demos keep the project on track.
Should I build a native or cross-platform app?
Build a cross-platform app with Flutter or React Native if you want one codebase, a lower budget, and the same features on iOS and Android. Choose native Swift and Kotlin if your app depends on heavy graphics, advanced hardware access, or new platform features at launch. We recommend the right option during discovery, based on your users and roadmap.
How do I outsource mobile app development?
To outsource mobile app development, choose an engagement model, share your goals and any existing research, and agree on scope, milestones, and communication. Use a fixed-scope project for a defined build, or hire dedicated developers through our Team as a Service model for ongoing product work. Either way, you get a dedicated project manager and regular demos.
Can ChatGPT or AI build my app?
AI tools like ChatGPT can speed up prototypes, code snippets, and testing, but they can’t deliver a production-ready app on their own. A reliable app still needs sound architecture, security, performance tuning, app store compliance, and ongoing maintenance. That’s where an experienced development team makes the difference between a demo and a product people trust.
Ready to Turn Your App Idea Into a Launch?
Talk with our mobile app developers about your goals, timeline, and budget. Start with a complimentary 30-minute strategy session.
Call
Office
4000 Legato Road, Suite 1100
Fairfax, VA 22033
Response
A strategist replies within one business day.
Request a proposal
Tell us what you need. You get a written proposal with scope, timeline and fixed pricing within two business days.