If you are planning a new mobile product or maintaining an older one, the Flutter vs Xamarin vs React Native question is probably on your desk. Five years ago these were three roughly equal contenders. Today the landscape looks very different: Microsoft has ended Xamarin support, .NET MAUI has taken its place, and both Flutter and React Native have matured into serious platforms backed by Google and Meta respectively.
Choosing a cross-platform framework is not just a technical preference. It shapes who you can hire, how quickly you can ship features, what your app feels like in users’ hands and how expensive the next five years of maintenance will be. Get it right and one team ships to iOS and Android from a single codebase. Get it wrong and you end up with a costly rewrite two years in.
This guide explains how each option works, where each one shines, what to do if you are still running a Xamarin app, and how we help clients make the decision in a structured way rather than by gut feel.
What happened to Xamarin, and why .NET MAUI is the real comparison
Xamarin let C# developers build iOS and Android apps, either with platform-specific UI (Xamarin.iOS and Xamarin.Android) or with a shared UI layer (Xamarin.Forms). It was a sensible choice for organisations already invested in Microsoft technologies, and many enterprise apps in South Africa and elsewhere were built on it.
Microsoft ended support for all Xamarin SDKs on 1 May 2024. That means no more security patches, bug fixes or updates to keep pace with new iOS and Android releases. Because Apple and Google regularly raise the minimum SDK and tooling versions required to publish apps, an unsupported framework will eventually block you from releasing updates to the stores at all.
The official successor is .NET MAUI (Multi-platform App UI). It is the evolution of Xamarin.Forms, rebuilt on modern .NET with a single-project structure and a redesigned “handler” architecture for mapping cross-platform controls onto native ones. So when people ask about Xamarin in 2026, the honest comparison is really Flutter vs React Native vs .NET MAUI, with the added question of how to move existing Xamarin code forward.
How each framework works under the hood
The three frameworks take fundamentally different approaches to the same problem: writing one codebase that runs on several platforms. Understanding the architecture explains most of their strengths and trade-offs.
Flutter: its own rendering engine, written in Dart
Flutter is Google’s open-source UI toolkit. Apps are written in Dart, and in release builds the Dart code is compiled ahead of time to native machine code. Crucially, Flutter does not use the platform’s built-in UI controls. Instead, it draws every pixel itself using its own rendering engine, with widget libraries that mimic Material Design (Android) and Cupertino (iOS) styling.
The result is a UI that looks and behaves identically across devices, which makes highly branded, custom interfaces easier to build and test. Flutter also targets web, Windows, macOS and Linux from the same codebase. Access to device features such as the camera, Bluetooth or biometrics happens through plugins, which use platform channels to talk to native Swift, Kotlin or Java code.
React Native: JavaScript driving real native views
React Native, created and maintained by Meta, lets developers write apps in JavaScript or TypeScript using the React programming model. Unlike Flutter, React Native renders genuine platform UI components, so a button on iOS is a real iOS view. Its “New Architecture” replaced the older asynchronous bridge with a more direct interface between JavaScript and native code, which improves responsiveness and makes native modules easier to integrate.
The official React Native documentation now recommends starting new projects with a framework such as Expo, which handles much of the build tooling, native configuration and over-the-air update workflow. For web-focused teams, the big attraction is that React skills, patterns and much of the tooling carry straight over.
.NET MAUI: C# and XAML on modern .NET
.NET MAUI lets developers build apps for Android, iOS, macOS and Windows in C#, with UI defined in XAML or in C# code. Like React Native, it maps its controls to native platform controls. Its strongest selling point is integration with the wider Microsoft ecosystem: shared libraries with your ASP.NET Core back end, familiar tooling in Visual Studio, and straightforward use of Azure services. It also supports Blazor Hybrid, which lets teams reuse Razor web components inside a native app shell.
Flutter vs Xamarin vs React Native: a side-by-side comparison
The table below summarises the practical differences we weigh when advising clients. Xamarin is listed as .NET MAUI, because that is the supported path for C# teams.
| Criteria | Flutter | React Native | .NET MAUI (Xamarin successor) |
|---|---|---|---|
| Backed by | Meta | Microsoft | |
| Language | Dart | JavaScript / TypeScript | C# (with XAML) |
| UI approach | Own rendering engine; draws all widgets | Renders native platform views | Maps controls to native platform views |
| Platforms | iOS, Android, web, Windows, macOS, Linux | iOS, Android (others via community projects) | iOS, Android, Windows, macOS |
| Visual consistency across devices | Very high | Follows each platform’s look | Follows each platform’s look |
| Best fit for teams who know | Any modern OO language; Dart is quick to learn | React and web front-end development | C#, .NET and the Microsoft stack |
| Typical sweet spot | Brand-heavy consumer apps, MVPs, multi-platform products | Products with a React web app, content and social apps | Enterprise and line-of-business apps in .NET organisations |
| Status in 2026 | Actively developed | Actively developed | Actively developed; Xamarin itself unsupported since May 2024 |
Performance and user experience in the real world
Benchmarks comparing frameworks circulate widely, but they rarely reflect the apps businesses actually build. For a typical business app (forms, lists, dashboards, maps, payments, notifications) all three frameworks can deliver a smooth experience. Where performance problems do appear, they are almost always caused by architecture: unnecessary re-renders, heavy work on the UI thread, oversized images, or chatty network calls.
That said, there are genuine differences worth knowing about:
- Animation-rich and custom UI: Flutter’s own rendering engine gives designers pixel-level control and consistent animation behaviour across devices, which suits apps where the brand experience matters most.
- Platform-native feel: React Native and .NET MAUI use the operating system’s own controls, so text inputs, scrolling and accessibility features behave exactly as users expect on each platform, with less effort.
- App size: Cross-platform apps generally ship a runtime or engine alongside your code, so a minimal app tends to be larger than a native equivalent. For most audiences this is a minor concern, but it is worth testing if your users are on entry-level devices or limited mobile data, as many South African users are.
- Startup time: Ahead-of-time compilation (Flutter and .NET) and modern JavaScript engines (React Native) have narrowed the gap considerably. Measure it on the low-end devices your customers actually use, not just on a developer’s flagship phone.
Team skills, hiring and long-term maintenance
In our experience, the most important factor is not the framework’s feature list but the people who will build and maintain the app for years to come.
Match the framework to your existing strengths
If your organisation runs on .NET, with C# developers maintaining ASP.NET Core APIs and Azure infrastructure, .NET MAUI lets those developers share models, validation logic and API clients between the back end and the app. If your product already has a React web front end, React Native lets the same team move between web and mobile. If you are building a new product team from scratch or outsourcing the build, Flutter’s single, coherent toolkit and strong documentation make it a productive default.
Think about the ecosystem, not just the core
Every real app depends on third-party packages for payments, analytics, maps, push notifications and authentication. Before committing, check that well-maintained packages exist for the integrations you need, including local ones such as South African payment gateways. An abandoned plugin can become a long-term maintenance burden that falls on your team.
Plan for upgrades
All three frameworks release new versions regularly, and mobile operating systems change every year. Budget time for framework upgrades as part of normal maintenance rather than treating them as emergencies. A codebase with good automated tests is far cheaper to upgrade, which is why we write unit tests for all business logic as standard.
What to do if you are still running a Xamarin app
Many organisations have a stable Xamarin app that “just works” and no appetite for disruption. The risk is that the app keeps working right up until a new store requirement, OS release or security issue makes it impossible to update. A planned migration is much cheaper than an emergency one. There are broadly three paths:
- Upgrade to .NET MAUI. Microsoft provides migration guidance and tooling, and much of your C# business logic can be carried across. Xamarin.Forms UI code maps reasonably well to MAUI, although custom renderers need to be reworked as handlers and some third-party libraries will need replacements. This is usually the lowest-risk option for C# teams.
- Rewrite in Flutter or React Native. This makes sense when the UI is dated and needs a redesign anyway, when the app’s business logic lives mostly on the server, or when your team’s skills have shifted away from .NET.
- Move to native Swift and Kotlin. Appropriate for a small number of apps that depend on cutting-edge platform features or have very demanding performance requirements, at the cost of maintaining two codebases.
Whichever path you choose, start with an audit: inventory the third-party packages, platform-specific code and test coverage in the existing app. That audit usually reveals which path is realistic far more clearly than any framework comparison article can.
A practical decision framework for CTOs and product owners
When clients ask us to help them choose, we work through a short set of questions during the Conceptual Phase of our process, where technologies are selected based on budget and scale. You can use the same checklist internally:
- Who will maintain the app in three years? An in-house .NET team points towards .NET MAUI; a React web team points towards React Native; a new or outsourced team can make Flutter very efficient.
- How custom is the design? Highly branded, animation-heavy interfaces favour Flutter. Apps that should feel like a natural part of iOS or Android lean towards React Native or .NET MAUI.
- Which platforms do you need beyond iOS and Android? If a desktop or web version is on the roadmap, Flutter and .NET MAUI cover more ground out of the box.
- What must the app integrate with? List every SDK, payment gateway and hardware feature, then confirm mature packages exist for your chosen framework.
- What does your back end look like? Shared code with a .NET back end is a genuine productivity gain; otherwise it is neutral.
- What is your budget and timeline for a first release? An MVP benefits from the framework your team is fastest in, not the one that looks best on paper.
At Adriel Corp we believe the right technology is the one that serves your vision, your budget and your scale, which is why technology selection happens deliberately at the start of a project, never by default.
If cost is part of the decision, our guide on what drives the cost of a mobile app explains how scope, platforms and integrations affect budgets regardless of the framework you choose.
Our view: there is no universal winner
We build with Flutter and have deep roots in the Microsoft and Xamarin ecosystem, so we see the strengths of each approach first-hand. For new consumer-facing products without an existing technical constraint, Flutter is frequently our recommendation because of its productivity, consistent rendering and multi-platform reach. For organisations heavily invested in .NET, .NET MAUI remains a sound and supported choice. React Native is an excellent option when an organisation’s front-end expertise is firmly rooted in React.
What matters most is making the choice consciously, validating it with a prototype before committing the full budget, and building with clean architecture and automated tests so that the framework never becomes a trap. Our Prototyping Phase exists precisely to confirm that the chosen technology can deliver the plan before full development begins.
For the official details on each platform, the Flutter documentation, the React Native site and Microsoft’s .NET MAUI documentation are the best starting points.
How Adriel Corp can help
Whether you are starting a new product or need a plan for an ageing Xamarin app, we can help you choose and execute with precision. Our Mobile App MVP Package takes a validated idea to a working cross-platform app, and our Discovery & Architecture Workshop is ideal if you first need an objective framework recommendation and migration roadmap. Tell us about your app and your team, and we will give you a straight answer on the best path forward.
