Mobile App Developmentfor iOS and Android
CodesSavvy is a mobile app development company that builds production-ready iOS and Android apps using React Native. Cross-platform, fixed price, senior engineers. One codebase. Both stores. No rebuilds.
We build mobile apps that are production-ready from day one. Clean architecture, native performance, proper offline support, App Store and Google Play submission handled. One React Native codebase that runs on both platforms -- no maintaining two separate codebases, no feature divergence.
Why We Use React Native
React Native is a framework by Meta that compiles JavaScript to native iOS and Android components. You get near-native performance with one codebase.
One Codebase, Two Platforms
Write once, ship to iOS and Android. Consistent features, consistent bugs fixed once, consistent design maintained in one place.
Near-Native Performance
React Native compiles to native components -- not WebView. Your app runs at 60fps on real hardware. Not a browser wrapped in a shell.
Shared Logic with Your Web App
If you have a Next.js web app, your React Native app can share authentication, business logic, and API calls. One team maintains both.
The one case where we don't use React Native: if your app requires deep hardware integration (custom Bluetooth protocols, ARKit/ARCore features, complex camera processing) or if you need maximum raw performance (game engines, real-time video processing), we will tell you upfront that native Swift/Kotlin is the right choice. We won't build the wrong thing to keep the project.
What Is Included in a CodesSavvy Mobile App
We scope every app differently. But here is what most production-ready mobile apps include when they leave our hands.
iOS & Android from One Codebase
React Native gives you a single codebase that runs on both platforms. You get two production apps maintained together, not separately. No diverging feature sets. No double the maintenance cost.
Authentication & User Management
Email/password, social login (Google, Apple, Facebook), biometric authentication (Face ID, fingerprint), secure token storage, and session management. Built correctly so credentials never sit in plain text.
Push Notifications
Firebase Cloud Messaging for cross-platform push. Notification scheduling, segmentation, deep linking from notification to in-app screen, and analytics on open rates. Notifications that actually get read.
API Integration
Your mobile app connected to your backend API, third-party services, payment gateways, and real-time data. Whether you have an existing API or need one built, we handle the full integration.
Offline Support
Local storage with SQLite or AsyncStorage, background sync when connectivity returns, conflict resolution for data written offline. Apps that work when users are on a slow connection or no connection at all.
Performance Optimisation
Fast list rendering with FlashList, image optimisation, lazy loading, bundle size reduction. Apps that open in under 2 seconds and scroll at 60fps. Performance is tested on low-end devices, not just the latest iPhone.
In-App Payments
Stripe for one-time payments and subscriptions. Apple Pay and Google Pay integration. In-App Purchase (IAP) for App Store billing if required. Handled correctly so you pass App Store review.
App Store Submission
Full submission to App Store and Google Play. Screenshots, metadata, privacy policy compliance, review process navigation. We have shipped apps on both stores and know how to get through the review queue without surprises.
How We Build Your Mobile App
Fixed timeline. Weekly builds you can install on your phone. No surprises.
Scope & Spec
We map every screen, every user flow, every API endpoint, every offline scenario, and every edge case. You receive a written spec with a fixed price and fixed timeline before we write a line of code.
Architecture & Foundation
Project structure, navigation setup, authentication system, API layer, local storage architecture, and CI/CD for mobile. By the end of week 2, you can run the app on your phone and see it working.
Core Screens & Features
The screens your users actually use. The flows that deliver your app's value. Every Friday you get a build you can install on your phone. Real, clickable software -- not wireframes.
Integrations & Secondary Flows
Push notifications, payments, third-party API connections, offline sync, and secondary user flows. The app starts feeling complete.
QA, Polish & App Store Launch
Testing on iOS and Android across multiple device sizes. Performance checks on low-end devices. App Store and Google Play submission. App is live in both stores.
Mobile App We Are Proud Of
A cross-platform note-taking Progressive Web App built for speed and offline-first usage. The product needed to work seamlessly across mobile and desktop, with real-time sync, offline access, and a distraction-free writing experience that competed with established tools like Notion and Bear.
We built on React and Firebase with a PWA architecture that installed natively on both iOS and Android home screens. Offline-first with background sync, push notifications for shared notes, and performance optimised for low-powered devices.
"The app installs like a native app and works entirely offline. Users can't tell it's a web app. That was the brief and they delivered exactly that."
Why Founders Choose Us for Mobile Development
React Native Specialists
We have shipped multiple production apps on React Native. We know the gotchas -- navigation performance, deep linking, background tasks, push notification edge cases. We have already made those mistakes so you don't have to.
One Codebase, Two Platforms
React Native means iOS and Android from a single codebase. Half the maintenance. Consistent features across platforms. Your team only needs to know one technology stack.
Fixed Price
Mobile apps are notorious for scope creep and runaway hourly bills. We give you a fixed price based on a detailed written spec. If we estimated something incorrectly, the extra time is our cost, not yours.
You Own the Code
Your code lives in your GitHub repository from the first commit. Your app is in your Apple Developer and Google Play accounts. We have never held a codebase hostage and never will.
Types of Mobile Apps We Build
We have built mobile apps for founders in:
Consumer Apps
Social features, real-time feeds, user-generated content, onboarding funnels, push notification campaigns, and viral growth mechanics.
SaaS Mobile Companion
Mobile interface for your existing SaaS product. Shared backend, feature parity with web, optimized for the mobile use case.
Marketplace Apps
Buyer and seller flows, in-app messaging, review systems, location-based search, and payment processing.
Healthcare Apps
HIPAA-compliant patient flows, appointment scheduling, provider communication, and secure health data handling.
On-Demand Apps
Location tracking, real-time status updates, push notifications, payment integration, and background services.
Internal Tools
Mobile apps for field teams, delivery drivers, and operations staff. Offline-first, barcode scanning, GPS tracking, and form submission.
What Clients Say
"The app installs like a native app and works entirely offline. Users can't tell it's a web app. 25,000 downloads and zero infrastructure issues since launch."
"They delivered iOS and Android at the same time, from one codebase. We expected to pay twice. We didn't. The performance on older Android devices was something we specifically worried about -- they handled it."
Mobile App Development -- Frequently Asked Questions
How long does mobile app development take?
A production-ready mobile app MVP takes 6-10 weeks. Simple apps with core flows ship in 5-6 weeks. Apps with complex integrations, real-time features, or hardware access typically take 8-12 weeks. You get a fixed timeline before we start.
How much does mobile app development cost?
Most mobile apps we build fall between $10,000 and $25,000 depending on complexity, number of screens, integrations, and backend requirements. We give you a fixed quote based on a detailed scope. No hourly billing.
Do you build for iOS and Android?
Yes. We use React Native to build a single codebase that runs natively on both iOS and Android. You get two apps for the cost of one, maintained from a single codebase.
What is React Native and why do you use it?
React Native is a framework by Meta that lets you build iOS and Android apps from one JavaScript/React codebase. It compiles to native components -- not WebView -- so performance is near-native. We use it because we have shipped dozens of production apps on it, you get both platforms at once, and it shares code with your existing web app if you have one.
Do you handle App Store and Google Play submission?
Yes. We handle the full submission process including screenshots, metadata, privacy policy requirements, and the review process. We have submitted apps on both stores and know how to navigate rejections.
Can you add a mobile app to my existing web app?
Yes. If you already have a web app or API, we build the mobile app against your existing backend. React Native can share auth tokens, API calls, and business logic with your web codebase.
Do you build mobile apps for non-technical founders?
Yes. Most of our mobile clients are non-technical founders. We explain every decision in plain language. Weekly builds you can install on your phone mean you always see exactly what is being built.
Related Reading
Ready to Build Your Mobile App?
Tell us what your app needs to do and who it is for. We will tell you honestly whether React Native is the right choice for your use case, what a realistic timeline looks like, and what it will cost -- before we start.
No pitch. No pressure. Just an honest answer.
Fixed price. Senior engineers. iOS and Android. You own everything. We work with founders in the US, UK, Canada, Australia, UAE, and Singapore.