Swift and React Native Role on the iOS App Development

An iOS is the sought-after platform for mobile app development because iOS-powered apps are high in demand all over the globe and have more download rate on all the app market places.  As there is spurred growth in the number of apps, it is a tough row to hoe to stand tall in the market. The only sure shot way to this is selecting the right coding language and framework that can render high performance that captures millions.

The design of any app development depends on coding and SDKs. Any iOS app development company must ensure that they build apps by keeping pace with the latest trends and upgrades in the OS, latest tools, and technologies. The popular language used in iOS app development is Swift and the framework is React Native. All the iOS developers are going after these two. Let us dive deep into each one with the features that made them a lead.

A short glimpse on Swift and React Native:


It is an open-source, a modern, and multi-paradigm programming language after objective-C developed by Apple to build applications on iOS, OS X, tvOS, watchOS. It is resilient against erroneous code and compatible with C and Objective-C. In a nutshell, it is a happy coding language.

React Native:

It is an open-source and cross-platform framework created by the social media giant ‘Facebook’. It is used to develop mobile apps using JavaScript on iOS and Android. It enables the app developers to use native platform capabilities along with the React.

These two are gaining traction of iOS app developers. Here is why.

The features that make app developers adopt Swift:

Fast and powerful:

It is faster than Objective-c, the earlier language before Swift because it uses a high-performance low-level virtual machine (LLVM) compiler. It makes the software faster and safer.

Simple and easy:

All the syntaxes used in this language are much simpler and cleaner with expressive denotation. It requires fewer lines of code. So, learning swift code is very easy. So, it is very easy to read and write.

Safe and secure:

Swift generates a compiler error. It is the prominent feature of the swift code. Whenever the developer writes an error in the code, it alerts by generating the error code. And the memory is managed automatically. Thus, it provides safety to the program. Developers can easily catch and fix the errors as soon as they are recognized.


Developers can write the code by mixing up the latest features of swift and objective-C. It has full compatibility with the Objective-C language. Otherwise, they can also incorporate the feature to the existing Objective-C code.


Swift is an open-source language. Anyone can use it on the open platform and modify the code as they want based on their application requirements. It supports dynamic libraries. Hence, all the developers have full control over the code to build responsive and rich-feature set iOS apps with this elegant open-source coding.

Modern and interactive:

This language is evolved after the in-depth research of all the previous languages by keeping pace with the latest trends and technologies of the OS design. As it uses both the C and Objective-C features, it exhibits greater interactivity while using the app.


As Swift uses safe and easy patterns of lines of code, the app is very flexible to use at the end-user perspective.

Automated memory management:

The automatic allocation and reallocation make this app easy to maintain. Thus, it has become easy to organize and maintain any project.


It is resilient against erroneous code. It can handle the errors while compiling make it error-free.

Moreover, there are additional features that make the app developers prefer  Swift are imperative, object-oriented, static, type-safe, shorter development cycles, return values and tuples, functional programming patterns, fast iterations and structs. All these features can also work together.

The features that make app developers adopt React Native:

Open source:

Like Swift, the React Native also an open-source framework in which code can be modified and enhanced. Every line of coding has a clear meaning and takes advantage of both native and hybrid apps.

Code reuse:

70% of the code is reused to develop cross-platform apps such as Android, iOS, and web apps. It is like “learn once and write anywhere”. Moreover, the language used in this framework is JavaScript, a simple and widely-used programming language.

Time and Money-saver:

The time taken for developing iOS apps using this library is less when compared to app development using Swift coding. As it uses a single code for all platforms, it saves hefty sums for app development.

Quick Refresh/Reload:

Any changes and iteration in the code can be refreshed and saved fast without consuming much time. This feature makes React Native win over Swift.

High-Performance on mobiles:

React Native makes the best use of its GPU (Graphics Processing Unit) and CPU of the native platforms hence it yields high-performance on mobiles.


It is developed to provide good UI so that it can help design robust and responsive mobile apps.

Support of third-party libraries:

Supportable to third-party libraries is an add-on to this framework and it is the main reason that many app developers find this flexible.


It is an innovative platform where the crew of developers work together to improve the code of the framework and develops tailor-made code packages for different projects.

iOS apps are evergreen whether they built with either Swift or React Native so the demand for the iOS app developers will be the same. Let us distinguish between Swift and React Native on several key factors with a closer look.

Key FactorsSwiftReact Native (RN)
Learning the codeEasyLittle bit tough
Use of APINo API limitationsLimited use
Also built onMac OS, OS X, tvOS, WatchOSAll the platforms
Development typePlatform-specificcross-platform
MemoryRequires less memoryRequires more memory
Benchmarking performance (CPU+memory)Consumes much memory and less allocation of CPUConsumes less memory compared to Swift
App sizeLess (can be trimmed with the help of dynamic libraries)large
UI/UXNative iOSUses both native components and APIs and cross-platform features. Good at UI.
TestingIn-built automation testingSupports other automation testing tools
Integration with CI/CD toolsAvailableAvailable
Development time and effortsmoreless
App maintenanceEasy, less neededhard
Compatibility with 3rd party libraries and release cycles (updates)GoodModerate
SecurityImpeccableGood with 3rd party libraries
CostExpensive than React Nativecost-effective
Application RangeSimple to complex projectsSimple to medium
Prone to errorslessmoderate
ApplicationsMedium, Vimeo, Firefox, LinkedIn, Twitter, Tumblr, etc.Wix, Instagram, Facebook, Myntra, Skype, WordPress, Walmart, etc.


Table: An in-depth comparison between Swift and React Native


In a nutshell, iOS app development companies are adopting Swift and React Native. The focal point is which one is better between the two. The answer is “it depends”. There is no candid answer for this because swift emerges as a winner when coming to simple syntax, security, memory usage, and use of APIs and outperforms RN whereas RN finds best with good UI, code reuse, time and cost savings.

If you are planning to launch an iOS application, then tie-up with the top mobile app development company that is adept at the latest technologies and trends and build cost-effective and modern apps on the iOS platform.

Wassay Ahmed is the president and Co-founder of Ideas Web Service, a company driven by results. With its top-class web services, the company claims to provide you with successful SEO campaigns for your business. Wassay has nearly 5 years of SEO, Digital Marketing, and Web Developments experience. Connect with him on LinkedIn.