React Native vs Flutter: Comparison and Choice

Mobile development frameworks are tools that simplify application development using ready-made modules and code templates. They are becoming increasingly popular due to their ability to reduce development time and project cost. Although there are many frameworks on the market, the two most popular are React Native and Flutter.

What is React Native?

React Native is a cross-platform JavaScript framework for mobile app development. It was created by Facebook and allows building React apps using a component-based architecture.
This framework is open-source and uses native components. It enables developers to create platform-specific applications using "native" components. You can develop applications for both iOS and Android.
The React Native developer menu features a quick refresh function that provides instant feedback on component changes. If the framework detects any changes in the JavaScript module, it updates the mobile components and allows developers to see changes in real time without needing to rebuild the repository.

Advantages of React Native

1. Community-driven framework
React Native is a community-driven framework that allows developers to communicate with each other. Its online community has tens of thousands of active members who provide support and advice to newcomers.
Additionally, the community has forums where developers get code reviews and feedback. They can find catalogs of shared components and corresponding documentation.
2. Higher performance
Since apps built with this framework run on mobile devices, they typically load quickly (60 frames per second). This also enables faster app publishing.
3. Faster development
As mentioned, quick refresh allows developers to see code changes in real time in the UI window. This speeds up development because the developer does not need to create builds to see changes.
4. Code reusability
React Native developers do not need to write separate code modules for different mobile platforms like Android and iOS. Instead, they can reuse code from one platform for another.
This improves coding efficiency and allows developers to bring products to market faster. It also simplifies code maintenance, as maintaining code for two different apps is much harder than for one. Additionally, it is a very cost-effective approach since you do not need to hire two different developers to write/maintain code.
5. Responsive UI
Apps developed with React Native have a fast and responsive user interface. They also feel native.

Disadvantages of React Native

Although React Native is an excellent mobile development framework, it has a few drawbacks that prevent it from creating fully native apps. Let's look at them.
1. Debugging
Like most JavaScript-based frameworks, apps built on React Native are difficult to debug. Moreover, they use native code, which can further complicate debugging.
This problem is exacerbated by the limited number of debugging tools available for the framework. Additionally, because JavaScript is a weakly typed language, there is almost no type safety, making it harder to scale the app.
2. Libraries
Despite having a huge developer community, the libraries are somewhat limited. There are not many custom modules, which may force developers to build everything from scratch.
3. Updates
Since this framework runs on a native system, it needs to be updated to function smoothly. Additionally, the community frequently releases new updates, so developers must constantly update their apps to keep up with core changes. Otherwise, rendering and UI issues may arise.
4. Learning curve
The learning curve for this framework is very steep because developers need to know JavaScript and JSX, as well as native components.
5. Complex UI
If you are building an app with complex UI features/design, such as a game, you are better off choosing a native framework rather than React Native. This is because React Native does not perform well in high-intensity applications.

Which Companies Use React Native?

Many organizations on the market use React Native for their development. Various industries and verticals use this framework to support their development. For example, React Native is used in popular social media apps like Facebook, Discord, and Instagram.
It is also used on content-publishing sites like Bloomberg and Pinterest. Additionally, transportation companies like Tesla and Uber use this framework.
Other examples include Skype, Salesforce, Wix, and Airbnb.

What Tools Integrate with React Native?

As mentioned earlier, the learning curve for React Native is quite steep. However, there are many tools that can be integrated with this framework to simplify work.
There are several tools that integrate with React Native, for example:
1. Redux
This is an open-source JavaScript tool for state management. It allows developers to maintain state for various components. It is very useful if a developer needs a single source of truth for state or to handle asynchronous actions.
2. Expo
This open-source tool helps developers build React Native apps with web assistance and development packages. It allows building and sharing implementations of native components such as cameras, maps, image pickers, etc.
This framework also offers documentation and manages acceleration changes for the app.
3. Jest
Jest is a scripting tool that allows developers to run unit tests for React apps. It was developed by Facebook and has built-in options for coverage, reporting, and snapshots. You can also use its API to write convenient test cases in your native coding tool.

What is Flutter?

Flutter is a powerful open-source mobile development framework from Google. It was created in 2017 and allows developers to build multi-purpose applications based on Dart UI components. With Flutter, you do not need to develop separate apps for Android and iOS; you can use a single codebase for both.
Flutter is incredibly fast and offers customizable widgets that can be used to create complex user interfaces. They allow integration of standard platform features such as scrolling, navigation, and fonts.
Additionally, the system uses a declarative UI that renders widgets only when their state changes. This improves app performance and allows users to load it quickly.

What are the Advantages of Flutter?

#1 Cross-platform development
Flutter is a cross-platform framework that allows you to build applications for various environments like iOS and Android using a single repository.
Flutter developers can use the framework to create platform-independent UI components, reducing UI inconsistencies and saving development time and effort.
#2 Widgets
Flutter uses widgets to create customizable UI components, allowing developers to quickly build and release apps. They simplify the process and cover various aspects of UI development.
#3 Complex design
With this framework, you can add complex UI components like shadows, fades, and color animations. These components are design-oriented and give the app a natural look.
#4 Hot reload
This is a built-in feature that allows developers to iteratively see code changes in the app’s final UI. With it, engineers can make UI changes, fix bugs, and add additional features to the app without creating a new build.
This is different from "hot restart," another Flutter feature that allows users to restart their apps. Even though hot restart does not preserve app state, it is still faster than a full restart.
#5 Performance
Thanks to widgets and the Dart programming language, Flutter is high-performing. This allows developers to add heavy animations, game features, and vector animations to their builds.
#6 Community support
Flutter has an active online community of enthusiasts and developers, making it easy for newcomers to learn the framework. Additionally, the community continuously shares experiences and knowledge.

Disadvantages of Flutter

Despite many advantages, Flutter also has some drawbacks. Here are some issues developers face when using Flutter:
#1 Use of Dart
Although Dart is a high-performance programming language, it has limited adoption among software developers. It is not very easy to learn.
And since you must learn Dart before building a Flutter-based app, it discourages many beginners from using this framework.
#2 Large file size
Apps built with Flutter tend to have large file sizes. Since the framework allows developers to create complex UIs using native code, the final app render is quite heavy compared to apps built with other frameworks. This can cause memory performance issues on mobile devices.
#3 64-bit ARM architecture
Flutter does not support the 64-bit ARM architecture, which may limit its use on some mobile devices. The nearest supported architecture is ARM64-v8A.
#4 Third-party libraries
Flutter faces stiff competition from other native development platforms like React Native in terms of availability of third-party libraries and modules. In some situations, this can limit development capabilities, as engineers have to write some components from scratch.

Which Companies Use Flutter?

Flutter is a popular app, and many companies use it for their development. Popular payment apps like Square and Google Pay use it to support their apps.
Flutter is also used by search engines like Baidu and Google. Additionally, e-commerce sites like eBay and Alibaba use this framework in their tech stack.
Other notable companies using it for development include Groupon, Dream11, CrowdSource, and iRobot.

What Tools Integrate with Flutter?

There are a number of tools that developers can integrate with Flutter, for example:
#1 Firebase
This web development platform provides users with real-time data synchronization and messaging features. The Firebase SDK can be programmed in various languages such as Java, Swift, and Objective C.
#2 Dart SDK
This is the Dart development kit with a command-line interface and libraries useful for Flutter development. It can be used to create, format, and test Dart code.
#3 Android Studio
This is a very popular Android app development environment. It can also be used to develop apps for programming languages like Java and Kotlin.
#4 Supernova
This design tool allows users to visualize font code from mobile design. It is an end-to-end design platform that also handles deduplication and documentation.

Key Differences Between React Native and Flutter

Both frameworks are excellent choices for cross-platform mobile app development, but they have several distinct differences.
#1 Size
As mentioned above, apps developed with Flutter have a larger file size due to complex UI components.
Although apps developed with React Native can also have large file sizes, their size can be reduced using tools like Proguard.
#2 Hot reload
While both frameworks have a hot reload feature that allows developers to test their code on the frontend, code rendering in Flutter is much faster than in React Native.
#3 Documentation and community
Flutter documentation is easy to read and organized. It is also very informative, allowing developers to quickly start building with Dart. React Native documentation, on the other hand, is difficult to understand and disorganized.
Flutter has a good online community of developers who constantly share updates with each other. However, since it is a relatively new framework, the community is much smaller than React Native's.
#4 Layouts
Flutter uses widgets for layout and design. This allows developers to easily add features and customize them.
React Native uses JavaScript and JSX for layout and design. This makes the UI design feel more native.
#5 Programming language
React Native uses JavaScript, which is inherently dynamic. Although it is more flexible, it creates security issues for the app. In contrast, Flutter uses Dart, which has both static and dynamic properties.

What Does the Future Look Like?

Both frameworks have huge online communities that keep them relevant. Additionally, many industries and organizations, as mentioned above, use these frameworks to support their business.

The latest version of React Native, 0.71, includes features such as TypeScript by default, component flexibility with Flexbox, and component highlighting to improve the developer experience. The name of the next version has not been announced yet. However, rumors suggest new features like automatic batching and strict mode behavior.

Flutter released its latest version 3.7 in January 2023. Developers gained the ability to pass configuration to Flutter engines and tools for better internalization support. It is now possible to create custom menu bars and cascading menus. DevTools also added many new features for debugging, performance monitoring, and memory inspection.

The name of the next Flutter release has not been announced yet, but it is rumored to focus on Impeller, Flutter's graphics rendering engine. It will include options for custom shaders and 3D support.

React Native vs Flutter: Who Wins?

Of course, it is very difficult to choose one framework. Both listed frameworks are very popular and allow developers to quickly build and deploy mobile apps. Depending on the specific use case, either may be better than the other.

So, let's look at different situations where you might use Flutter and React Native.

As an organization, you should use React Native only if your team is trained in React and JavaScript. They should also know how to perform intensive debugging of JavaScript code.

Additionally, it is important to note that React Native is great for building apps using pluggable native modules and third-party libraries. Finally, if you want to create 3D animations/components in your app, you should choose React Native since Flutter currently does not support 3D.

However, if you want to develop an app that solves customer tasks, requires native programming, and places great emphasis on UI, then Flutter is the way to go.

Flutter is also better to use if you need features like accelerated builds and fast hot reload. Additionally, Flutter is better in situations where code sharing is required, since most of Flutter's code can be shared across platforms.