A question we often get in 2020 is whether React Native or Swift is the better platform for iOS app development. Both platforms can be used to create excellent native apps that run smoothly on iOS, but they require different skill sets and resources to build. The framework you ultimately decide to use has both financial and technical implications for you and your team. So let’s dig in.

Table of Content:

  1. Introducing Swift and React Native
  2. Performance
  3. Maintenance
  4. Third-party APIs
  5. Over-The-Air Updates
  6. Which Platform is best for complex enterprise apps?
  7. Finding developers for Swift and React
  8. Is it safe to build your app on an open-source framework?
  9. Are React and Swift HIPAA, PCI compliant?
  10. Choosing between the two
  11. Our Experience in Swift App Development 
  12. Our Experience in React Native App Development

Introducing Swift and React Native


swift logoSwift is the official native app-building framework for the Apple family of products. It’s designed as a one-stop platform for building macOS, iOS, watchOS, and tvOS apps. It’s also Apple’s platform for future product development. It’s an upgrade from Objective-C.

Apple has developed Swift to make the most of its hardware. So the software is purpose-built to leverage all the power and capabilities that Apple hardware has to offer.

The company regularly updates Swift: The most recent version is Swift 5, but there are still many apps written in Swift 4 and even Swift 3 that continue to work seamlessly on the newer phones.

React Native

react native logoReact Native is a cross-platform open-source native app-development framework for iOS and Android that’s owned and maintained by Facebook. The primary focus is on iOS and Android. As AppleTV is based on iOS, it’s also officially supported by React Native.

While there is no official support for macOS and watchOS, React Native works on these platforms as well. Albeit, there’s far less community support for React Native apps targeting those devices.

React Native was born out of necessity. Facebook had a problem, a big one. They were relying too heavily on HTML5 to create and deliver a cross-platform experience to their users. They had the right idea but the wrong framework. HTML5 was great but it was slower than native apps. As a result, React Native was created. It was the bridge they needed to deliver a seamless user experience across Android and iOS with a native look, feel and performance.

React has a very firm target – iOS and Android app development. Period. And unlike Apple, Facebook doesn’t control the hardware so it has to adapt its framework to the changing ecosystem.


comparing performance react vs swift This performance comparison is strictly based on iOS device performance. These results are combined from analyses drawn by John A. Calderio and Rakshit Soral in separate studies. The conclusions were reached by comparing data generated when using an identical app built with either Swift or React Native.

The app has 4 basic features

  • A profile page which uses Facebook API to sign in.


facebook profile

  • To-do list where a user can add or delete tasks from a list.

todo list


  • Three blank pages.

three blank pages


  • A map that uses the inbuilt GPS on the phone to show a pulsating blue dot on the current location of the device.


gps on mobile


The test was simple. They had to capture device metrics using Apple Instruments each time one of the 4 app features or functions was accessed. We’ll take a look at the results for CPU performance and memory allocation. We’ll also check out the app size.

Because the results from both experiments were similar, we’ve used images from John’s experiment to illustrate them.



memory usage

React Native is the clear winner in memory allocation. Swift shows a huge spike in memory use when adding and deleting a task on the to-do-list as well as when the map is opened.


cpu usage

Swift has a slight advantage over React Native here. It is more efficient with CPU usage in this test by 17.58%. It uses slightly less processing power than React when viewing pages as well as when the map is clicked and the app looks for the device’s GPS.

It seems that while React Native is better at memory allocation, it offsets this by clocking in a higher CPU usage than Swift. While this is not a big deal for regular apps, it can be an issue for complex enterprise apps that need more processor power and speed.  An example of a complex would be an app like Slack with multiple accounts open at the same time.

App Size

React Native apps tend to have a larger file size compared to those built with Swift.

React Native vs. Swift banner


In our experience, when it comes to app development costs, maintenance is 25-30% of the total expenses. Between the two, React Native requires more maintenance work than Swift as updates for React Native are released more frequently. As a result, you may spend a bit more on maintaining a React Native app than one made using Swift.

Related: Android and iOS UI Design for React Native Developers

It’s not unusual to have breaking changes, libraries and dependencies that need to be updated and tested at least once every quarter. The tradeoff here is that you can reuse the code on Android. But for an app that’s going to be purely iOS-based, it’s probably not worth the extra spend.

Third-party APIs

third part API

React Native and Swift both support third-party libraries and APIs. And, as mentioned above, due to the frequent updates on React, there is a constant need to monitor changes in compatibilities. This should be accounted for in terms of financial and time costs when deciding which platform to go with.

Over-The-Air Updates

Over-The-Air updates are an important feature in the app maintenance and development process. They enable quicker bug identification and resolution. OTA updates allow you to push limited updates to your app without users having to download a new version from the App Store.

When a new feature is launched and it breaks your app, you can remotely fix feature without releasing a new build too. This spares you the trouble of having to roll back an entire version of your app in order to fix the problem. It also means you can deliver an enhanced user experience. Users can be unforgiving with their expectations. Always keep the user experience at the top of your priorities.

OTA updates give you the rare opportunity to launch a first stage MVP (minimal-viable-product) and then tweak it to perfection based on feedback.

CodePush, a Microsoft product, is the most popular OTA update platform. It supports OTA updates for React Native apps. All React Native apps created on Microsoft’s Visual Studio App Center have CodePush enabled by default.

Swift doesn’t support CodePush.

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React Native vs Swift: Which platform is best for building complex enterprise apps?

react vs swift mobile app development

Without a doubt, Swift. It’s optimized to make the most of Apple hardware and has less frequent platform source code updates. As such, complex enterprise apps are best written in Swift. Technically speaking, there is nothing that can be done in Swift that can’t be achieved with React Native. But as we get into the weeds of an app with hundreds of screens, React can potentially “make something that would be trivial in native very difficult.”

The platform is new and not as mature as Swift. It changes very rapidly and things break easily and fast.

Let’s take a look at an interesting example. Airbnb adopted React Native in 2016 just after it was launched. They were one of the earliest Silicon Valley adopters and built up to 880 screens in React Native, with numerous third-party integrations. But after only two years, they decided to sunset React Native in 2018 because they felt the platform was immature and it didn’t work well for their app and numerous integrations.

The truth is, while their developers found it easy to learn React Native, they also found it difficult to debug because of the rapid change. Eventually, they decided that working with native platforms like Swift was more economical and sustainable for their business.

If you’re reading this and wondering, “Well if Airbnb was a startup that ran into this problem, why shouldn’t I just build it correctly from day 1?” Well, you have to remember – pretty much every startup that scales into millions of users hits walls that make a rewrite sensible. Twitter, for example, started as a Ruby on Rails app and then rewrote into Javascript once it had enough users.

If you’re a founder of an early-stage startup, just be aware that you may have to rewrite the technology later on into a mature platform like Swift, but by then you’ll have a very different runway to invest into the transition.

Finding developers for Swift and React Native

There are more developers for React Native than Swift. This gap in the market makes hiring a Swift developer more expensive than one for React Native. So if you want to build your own team of developers to manage your app after it’s been built, it’s more practical for you to go with React Native.

Is it safe to build your app on an open-source framework?

Yes, so long as you know what you’re doing and have the right resources. Open source doesn’t equal unsafe. In fact, it may even prove to be better because the platform can support functions that Swift doesn’t due to proprietary issues. Also even though React Native is open source, it’s owned by Facebook. They have every reason to keep it current.

React Native has a very large and active community of developers all over the world who are not shy or slow to sound the alarm when something goes wrong. For example, in 2017 Facebook moved to change the React Native license to include protection for their patented functions. WordPress, immediately announced they were pulling the plug on React Native for their Gutenberg update.

7 reasons to invest in rapid prototyping

WordPress controls a quarter of all websites on the internet. Many other React Native developers also protested the action taken by Facebook. A few days later, Facebook rescinded its decision. The React Native community’s voice is strong. Facebook can’t pull the plug on React Native easily. That type of activism in the community makes the platform safer. Apple, on the other hand, is known to be a stickler for not listening to developers as far as proprietary functions are concerned.

Are React and Swift HIPAA, PCI compliant?

Swift and React Native are just platforms. They don’t need to sign a BAA in order to be HIPAA compliant. It’s how you build your app that makes it compliant. Whether or not you use either will not affect the HIPAA compliance status of your app.

As far as security is concerned, both platforms can be configured to provide very high and equivalent levels of security for your users. You can even make use of hardware such as FaceID and fingerprint recognition.

Choosing between the React Native and Swift

choosing between react native and swift

When deciding which platform to use for custom app development, it all comes down to what you want to achieve. You won’t be able to tell the difference with the naked eye between a React Native and Swift app. So, here are some variables for you to consider:

  • If you are building an app that you intend to extend to the rest of the Apple family of products, Swift is the platform of choice.
  • If you are building an app that you might need to extend to Android in the future, then you should start off with React. This will save you the headache of having to start from the very beginning all over again.
  • If time to market is your primary concern either of the two platforms is fine.
  • If being able to find a team of developers is a potential challenge, then React Native is your favorable option because there are more React Native developers than there are for Swift.

Our Experience in Swift App Development

While everybody wonders, “Will React Native replace Swift?”, we deliver apps tapping into the advantages of both platforms.

The most recent apps we developed using Swift were a fintech app called Sherpa and a healthcare app, iFaint. And there was a particular reason for choosing iOS Swift vs React Native in both cases.

Sherpa is a habit-changing app for managing personal finances. The app analyzes your spending habits and projects your budget into the future to help you take control over money.

The app’s very nature demanded the highest security standard for protecting user financial data flowing between the app and their bank accounts. That’s why we opted for Swift to have as little friction with implementing bank-grade security features as possible.

sherpa app screenshot

Read the case study to learn more.

iFaint was an app we built for the Stanford University School of Medicine. They were running a study on fainting spells and how they affect heart rate. As you’d imagine, the app had to integrate with external sensors for measuring the users’ heart rate.

Another layer of complexity was integrations with Apple’s HealthKit and Google’s Map for the app to read user data reliably and tie each incident of a fainting spell to a location. Therefore, Swift was kind of a natural choice for the project: Swift’s performance is very predictable when it comes to integrating with third-party libraries.

ifaint app screenshotRead the case study to learn more.

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Our Experience in React Native App Development

Similarly, we chose to go with React Native vs iOS Swift on several other projects to get the upside of developing cross-platform apps. Faster time to market. That’s what it’s all about most of the time. Plus, with apps that don’t need AI/ML or complex computations and immersive animated graphics, React Native performance suffices.

One of the exciting applications we built using React Native was Smarter Symptom Tracker for the TMJ & Sleep Therapy Centre Of San Francisco. By applying universal design principles to iOS and Android platforms and choosing to go with React Native, we were able to ship for iOS and Android simultaneously.

Besides that, we got to reuse some app components for a web application tailored to doctors, which, of course, had a positive impact on the overall delivery timeline.

smarter symptom web app dashboard

Read the case study to learn more.

Another case where we were able to get the best out of the technology was Helpkin, a startup looking to help friends trade services like pet and babysitting. Helpkin wanted to enter the market with both iOS and Android versions at the same time, and React Native was the best solution to achieve that goal.

helpkin app screenshot


As you can see, there are various scenarios that will determine your decision – both financial and technical. Take some time to look carefully at your project before making the leap.

Not sure which platform you should use? We can help. Whether it’s questions around what platform, costs, or how long it will take do develop your app, book an App Strategy Consultation session with us here.

This post was originally published in September 2019, and has been updated in October 2020. 

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