Cross-Platform App Development

One Codebase.
Both Stores.

Design, development, and everything in between, built once and shipped to iOS and Android from a single team. Every app is fast, secure, and built to feel native on both platforms.

React Native & FlutterSingle CodebaseApp Store & Play Store ReadyLegacy consolidation
130+
Cross-Platform Apps Shipped
99.6%
Avg. Crash-Free Rate
2.1×
Avg. Retention Lift
6+ Yrs
Cross-Platform Development Experience
Our Process

How we build step by step

A structured process ensures nothing gets missed, from initial discovery to a fully optimized launch on both stores.

  1. 01 Discover

    Discovery & Requirements Mapping

    User flows, feature scope, target platforms, and technical requirements mapped out end-to-end before a single line of code is written.

  2. 02 Design

    UI/UX & Shared Architecture

    Screen flows, shared component structure, and a design system that adapts to both iOS and Android decided up front, so the app feels native everywhere and is easy to extend.

  3. 03 Build

    App Development & QA

    Secure, maintainable apps built on a single codebase with modern frameworks, tested across both iOS and Android devices, OS versions, and screen sizes before it ever reaches the stores.

  4. 04 Launch

    Launch & Optimization

    App performance audits, crash-free rate checks, analytics setup, and dual submission to the App Store and Play Store. Plus 30-day post-launch support for refinements.

What's Included

Every cross-platform service we offer

Consumer apps, e-commerce apps, native module integrations, or API work, we cover the entire app end-to-end, not just the parts that are easy to template.

Custom Cross-Platform App Development

End-to-end apps built once, shipped to both iOS and Android, with a modern UI, backend services, authentication, and complex business logic.

  • React Native
  • Flutter
  • Single Codebase

Cross-Platform UI/UX Design & Prototyping

Interfaces designed to feel native on both platforms, following iOS and Material Design conventions where each matters, with interactive prototypes validated with real users first.

  • Adaptive UI
  • Figma Prototypes
  • User Testing

Native Module & Platform-Specific Integrations

Custom native modules for the rare cases a shared framework can't reach, so you get the speed of a single codebase without giving up platform-specific capability.

  • Native Bridging
  • Swift
  • Kotlin

Cross-Platform E-Commerce & Marketplace Apps

Shopping apps with product catalogs, cart, in-app payments, and push notifications, built once and consistent across both stores.

  • In-App Payments
  • Push Notifications
  • Catalogs

API Development & Third-Party Integrations

RESTful and GraphQL APIs connecting your app to payment gateways, CRMs, and internal systems, built and documented alongside the app itself.

  • REST APIs
  • GraphQL
  • Integrations

Legacy App Modernization

Migrating separate native iOS and Android codebases into a single cross-platform architecture, incrementally or as a full rebuild, without disrupting the users who depend on it.

  • Migration
  • Consolidation
  • Zero Downtime

Performance & App Store Optimization

App size and startup time optimization paired with crash monitoring across both platforms, plus store listing tuning, so speed and discoverability are solved on both ends.

  • App Size Optimization
  • Crash Monitoring
  • ASO

Ongoing App Development & Support

Continuous feature development across both platforms from one codebase, framework and dependency upgrades, security patching, and bug fixes, so your app keeps evolving long after v1 ships.

  • Monitoring
  • Security Patching
  • Support
What You Get

Every deliverable included

  1. Production-Ready Shared Codebase

    Clean, documented code running both iOS and Android from a single source, handed off through your Git provider of choice, ready for your team to extend.

  2. Fully Tested Build

    Every screen tested and refined across iPhone, iPad, and Android device sizes and OS versions, not just previewed on one simulator or emulator.

  3. Dual Store Ready Submission

    Signed builds, listing assets, and compliance checklists for both the App Store and Play Store prepared so your app is ready for review on both platforms at once.

  4. Performance Report

    A before-and-after performance report covering app startup time, memory usage, and crash-free rate on both platforms, benchmarked with real-device testing.

  5. API Documentation

    A documented API reference so your team can extend the app or backend without guesswork.

  6. 30-Day Support Window

    Post-launch support for bug fixes, configuration tweaks, and technical questions across both platforms at no extra cost.

Selected Work

Cross-platform apps we've shipped

A cross-section of cross-platform work, from consumer apps to enterprise tools and e-commerce shopping apps.

Consumer Utility App

Daily Habit Tracker App

Full cross-platform rebuild pairing a single React Native codebase with a lightweight backend for a habit-tracking app. Crash-free rate went from 91% to 99.6% across both platforms, and retention grew 2.1× in six months.

  • React Native
  • TypeScript
  • Push Notifications
LeadPro

Field Sales Companion App

Custom-built cross-platform app and backend replacing a paper workflow for a sales team of 40 across mixed iOS and Android devices. Cut report submission time from hours to minutes.

  • Cross-Platform
  • APIs
  • Offline Sync
E-Commerce Fashion & Lifestyle

Meridian Boutique Shopping App

Custom cross-platform shopping app and order backend for a DTC fashion brand, shipped to both stores from one codebase. App launch time dropped from 4.2s to 1.1s and mobile revenue rose 34%.

  • In-App Payments
  • Catalogs
  • CRO
Logistics & Fleet Management

RouteWise Driver App

Real-time fleet tracking app with a live-updating UI and event-driven backend for driver check-ins, running identically on iOS and Android. Cut dispatch response time by 45%.

  • Real-Time Data
  • APIs
  • WebSockets
Legacy Modernization

Harbor Freight Ops App Rebuild

Consolidated two separate native iOS and Android codebases into a single cross-platform app with zero downtime during the transition. App startup time dropped 78%.

  • Migration
  • Consolidation
  • Modernization
Consumer SaaS

Roastworks Subscription App

Custom cross-platform subscription app with recurring billing and push-driven engagement for a coffee subscription brand, launched on both stores simultaneously. App became the top acquisition channel over web.

  • Billing
  • Push Engagement
  • Retention
Client Voices

What it's like to work with us

We measure success in crash-free rates and retention across both platforms, not just how a screen looks. Here's what a few clients had to say.

We were quoted double for separate iOS and Android teams elsewhere. One cross-platform codebase gave us both apps in the same timeline, and our retention more than doubled after the rebuild.
Ananya Kapoor
Head of Product, WooCommerce
They handed off a single codebase our own engineers actually enjoyed working in, with patterns that made every new feature ship to both platforms at once.
Rohan Mehta
Founder, Meridian Boutique
Consolidating our two legacy apps into one felt daunting, but the transition was seamless and crash rates dropped almost overnight on both platforms.
Daniel Cruz
Operations Lead, Harbor Freight
Transparent Pricing

Simple, honest pricing

No hidden fees, no surprises. Choose a package that fits your scope or talk to us for a custom quote — one price covers both iOS and Android.

Starter

₹ 25Konwards

Perfect for simple utility apps and MVPs that need to launch on both stores from a single build.

  • Up to 6 screens
  • iOS & Android from one codebase
  • Adaptive native-feel UI
  • Unlimited revisions
  • Basic backend integration
  • App Store & Play Store submission included
  • 1 year free support
  • Full e-commerce build
  • Custom SaaS application
  • API integrations
Get Started

Enterprise

Custom

For large-scale apps, legacy consolidation, custom platforms, or teams needing an embedded cross-platform development team on retainer.

  • Unlimited screens
  • Full multi-module app build
  • Legacy iOS/Android consolidation
  • Unlimited revisions
  • API & third-party integrations
  • Advanced performance tuning
  • App Store & Play Store submission included
  • 1 year free priority support
  • Dedicated development lead
  • Monthly retainer available
Talk to Us
FAQ

Common questions

Anything else on your mind? Drop us a message at info@sitefiy.com

A single codebase means feature parity by default, one team instead of two, and roughly half the ongoing maintenance, without giving up the native performance and feel users expect on either platform.

It depends on the project. A common choice is React Native or Flutter for the shared app layer, backed by Node.js or Laravel APIs, with native modules bridged in for the rare platform-specific capability. We'll recommend the right combination during discovery.

Done well, cross-platform apps render real native UI components, not a web view. Users interacting with a well-built React Native or Flutter app generally can't tell it isn't fully native.

A simple utility or MVP app typically takes 4–8 weeks; a complete consumer app or complex platform usually takes 10–20 weeks depending on scope, for both platforms. We share a detailed timeline in our proposal before development begins.

We test across a spread of iPhone, iPad, and Android device sizes and OS versions throughout development, not just at the end, and profile startup time, memory usage, and crash-free rate against real hardware on both platforms.

Yes. We migrate separate native codebases into a single cross-platform architecture, either incrementally alongside the existing apps or as a full rebuild, with a plan designed to avoid disrupting existing users on either store.

We handle the full path from build to publish on both stores, including signed builds, listing assets for each platform, and ASO, so your app is ready for review and discoverable everywhere it launches.

Yes. Upon receipt of final payment, full IP and the complete shared codebase transfer to you through your own Git repository and store accounts, no vendor lock-in.

We offer optional retainers for continued feature development across both platforms, framework and dependency upgrades, security patching, and bug fixes after launch. It's entirely opt-in, not bundled by default.
Ready to Begin

Let's build an app
for both platforms at once

Tell us about your project and we'll get back within 24 hours with a tailored cross-platform development proposal, no commitment required.