Cross Platform App Development With React Native and Flutter

Cross platform app development lets you build an iOS app and an Android app from one shared codebase instead of two separate ones. For most business, ecommerce and SaaS companion apps, that means one team, one set of features to test and one release schedule, while users still get an app from their own store that looks and behaves the way they expect on their phone.

It is not free of trade-offs. Some device features still need platform-specific code, framework upgrades need planning, and a badly built cross-platform app feels sluggish in a way users notice. As a cross platform mobile app development company, we explain how we choose between React Native and Flutter, where cross-platform struggles, and how we build so those limits do not surprise you. For the wider picture, including native builds, see our mobile app development company page.

Our Cross Platform Mobile App Development Services

• Framework selection. A written recommendation for React Native or Flutter based on your features, your existing code and who will maintain the app.
• Shared app code. Screens, navigation, state, API calls and business logic written once for both platforms.
• Native modules. Swift and Kotlin code for the features a framework cannot reach on its own, wrapped so the rest of the app can use them.
• Backend and admin. The API, database and admin panel the app depends on, built by the same team as part of our web application development practice.
• Store release. Builds, signing, listings, privacy disclosures and review handling for both the App Store and Google Play.
• Updates and upgrades. Framework and SDK upgrades, OS compatibility fixes and over-the-air updates where the platform rules allow them.

React Native or Flutter: How We Choose

Both frameworks are mature. The right choice depends more on your situation than on the frameworks.

React Native app development

React Native, maintained by Meta, uses JavaScript or TypeScript and renders real native interface components. We build React Native apps with Expo, which the React Native documentation now recommends as the default way to start a project. Expo gives us managed builds through EAS, maintained device modules and over-the-air updates. React Native is our usual recommendation when you already have a React website or web app, because developers, patterns and sometimes code can be shared between web and mobile.

Flutter app development

Flutter, maintained by Google, uses the Dart language and draws its own interface with its own rendering engine rather than using the platform's components. That suits highly branded, animation-heavy interfaces. We recommend Flutter when the design is highly custom and there is no existing React code to share.

Other cross-platform frameworks

Kotlin Multiplatform shares business logic in Kotlin while each platform can keep its own native interface, which suits teams with strong Android developers. .NET MAUI suits companies already standardized on C# and Microsoft tooling, and Ionic wraps web code in a native shell. We consider them when your team or existing code points that way, but for most new business apps React Native or Flutter has the larger ecosystem.

Where Cross-Platform Mobile Development Needs Extra Care

Most cross-platform problems come from assuming the framework handles everything. We plan for these areas during scoping.

• Background work. Location tracking, background uploads and scheduled tasks behave differently on iOS and Android, and both platforms restrict them to save battery. These features usually need native code and careful testing on real devices.
• Bluetooth and hardware. Printers, scanners and wearables rely on native libraries, so we check that maintained modules exist before choosing a framework.
• Widgets and extensions. Home screen widgets, share extensions and watch apps are written natively.
• Performance on long lists and heavy screens. Product catalogs and feeds need virtualized lists, image caching and careful state management, or the app stutters on mid-range Android phones.
• Framework upgrades. Both frameworks release regularly, and staying current in small steps is far cheaper than jumping several versions at once, so upgrades are part of our maintenance plans.

How We Deliver Cross-Platform Apps

1. Discovery and framework decision (2 to 3 weeks). We list every feature and device capability, check module support in both frameworks, and recommend one in writing. You get a fixed-price scope for the first release, and the discovery fee is credited to the build.
2. Design for both platforms (2 to 4 weeks). We design one interface in Figma and mark where iOS and Android conventions should differ, such as navigation and back behavior. You approve clickable prototypes of the main flows before any code is written.
3. Build with real-device testing (8 to 16 weeks for a typical first release). Each two-week cycle ends with a build on your phone through TestFlight and Google Play internal testing, tested across older and newer devices on both platforms. The range depends mostly on the number of screens, integrations and native modules.
4. Submit and release (1 to 2 weeks). We prepare both store listings, submit, answer reviewer questions and release in stages where the stores allow it. A first submission can take longer if a reviewer asks for changes, so we leave room before any launch date you announce.
5. Maintain (monthly). After launch we watch crash reports, ship fixes, and keep the framework and SDKs current on a monthly plan.

Deliverables From Our Cross Platform App Development Services

• One React Native or Flutter codebase in your GitHub organization, with commit history, a README and setup steps any developer can follow.
• Published iOS and Android apps under your own Apple Developer and Google Play Console accounts.
• The API, database and admin panel the app uses, deployed to hosting in your name.
• Build and release pipelines (Expo EAS, Fastlane or Codemagic) so new versions can be shipped by anyone with access, not only by us.
• Figma design files, store listing copy, screenshots and privacy disclosures for both stores.
• Crash reporting and analytics events set up and documented, so you can see how the app is used from launch day.

What success looks like for a cross-platform app

We agree measurable outputs during discovery: both apps approved and live, every flow on the scope list working on the agreed range of iOS and Android versions, crash-free sessions tracked in Sentry or Crashlytics, and lists and screens that stay smooth on a mid-range Android phone. Downloads, ratings and revenue depend on your product and marketing, so we help you track them but do not promise them.

Cross-Platform vs Native App Development

Native app development means writing the iOS app in Swift and the Android app in Kotlin, as two separate codebases. Cross-platform shares most of the code. The table shows where each approach wins.

If your app is mainly forms, lists, content, checkout and account screens, cross-platform is usually the better value. If one platform matters far more than the other, or the product depends on deep hardware access, see our iOS app development and Android app development pages.

Cross Platform App Development Mistakes We Fix

• Choosing the framework before the features. A team picks Flutter or React Native out of habit, then finds the Bluetooth printer or payment terminal SDK only supports the other one. We check every device dependency first.
• Treating both platforms as identical. iOS users expect swipe-back navigation and Android users expect the system back button to work. Ignoring this is the fastest way to get "feels like a cheap app" reviews.
• Skipping framework upgrades for a year. Jumping several React Native or Flutter versions at once often breaks third-party modules and turns a routine update into a mini rebuild.
• No offline or slow-network handling. Apps that freeze in an elevator or on rural mobile data lose users. We cache data and show clear states when the connection drops.
• Store accounts in the agency's name. If the developer owns the Apple or Google account, transferring the app later is slow and sometimes painful. Yours should be in your name from day one.

Cross Platform App Development Tools

Why Choose 95 Solutions for Cross Platform App Development

• Senior-led decisions. Mustafa leads strategy on every account and holds a BS in Computer Science, so the framework choice is made on your requirements.
• Backend depth. We build and run our own SaaS product, AM Jarvis, and the custom CMS behind this site, so the API your app depends on gets the same care as the app.
• You own it. Code in your GitHub organization, apps under your developer accounts, and Expo or build service accounts in your name.
• Clear terms. Fixed prices per phase, USD contracts from our US LLC, and working hours that overlap UK business hours and the full US business day.

Who Should Build a Cross-Platform App

A good fit: ecommerce brands building shopping or loyalty apps, SaaS companies adding a companion app, startups that need both platforms from launch on one budget, and companies with an existing React web app.

Probably not a fit: 3D games, apps built mainly around augmented reality, or apps where nearly every feature depends on deep, platform-specific hardware access. Native app development or a game engine will serve those better.

Cross Platform App Development Pricing

We price cross-platform app development services as a paid discovery sprint credited to the build, then a fixed price for the first release against a written scope, followed by a monthly maintenance plan. What drives the cost is the number of screens and user roles, how many native modules the app needs (background location, Bluetooth, widgets), the integrations behind it (payments, Shopify, a CRM), whether we also build the backend and admin panel, and how much custom animation the design calls for. The plans below show where each stage starts.

For a quote on your app, describe the features you need on our contact page. If the app is the mobile side of a subscription product, our SaaS development team can scope both together, and our ecommerce development team covers store-connected apps.

How to Choose a Cross Platform Mobile App Development Company

1. Ask why they recommend their framework for your app. A React Native app development agency that has never weighed Flutter (or the reverse) will recommend what it knows, not what fits.
2. Install something they built. Open a live app on a mid-range Android phone and scroll a long list. Stutter there tells you more than a portfolio page.
3. Check who owns the accounts. Code, Apple and Google developer accounts, and the Expo or Codemagic account should all be yours.
4. Ask how they handle native modules. A good Flutter app development agency or React Native team should have written Swift and Kotlin, not only installed packages.
5. Ask what upkeep costs after launch. OS releases every year mean any app needs maintenance. A provider that does not mention it is leaving you to find out later.

Your Next Step Toward a Cross-Platform App

Send a short outline of the app: who uses it, the main screens, and any hardware or systems it must connect to. We reply within one business day, book a short call to fill the gaps, and then send a written discovery scope with the framework we would recommend and why. Start on our contact page, or call or WhatsApp us from there if that is easier.