React Native development is usually chosen to save time: one codebase instead of two, one team instead of two. That holds in practice, though not as cleanly as it is sold. Here is what the sharing actually covers, where it stops, and how to decide whether it suits your app.
Key takeaways
- Expect to share 70 to 90 per cent of the code. The remaining slice is often the part that takes the time.
- It fits apps where content and business logic dominate, rather than graphics and hardware.
- Choose native when the app lives on the camera, background work, Bluetooth or heavy animation.
- The saving is in maintenance over years, not in the first release.
- You still need people who understand both iOS and Android. The codebase is shared, the platforms are not.
- Build the three hardest screens first, not the easy ones.
When React Native development is the right call
There is a clear pattern in the projects where it works. The app shows and edits data from your systems. It has many screens, few of them visually unusual. The business logic is identical on both platforms, and you want new features on both on the same day.
That covers most apps built for customers, staff and partners: booking, self-service, ordering, reporting, internal tools. It is also where the saving is largest, because every new feature would otherwise be built and tested twice.
When to choose native instead
Four things make native the right call even when it costs more.
- Hardware. Advanced camera work, Bluetooth devices, NFC or sensors where timing matters.
- Background work. Apps that must do something while closed, such as continuous location, syncing or audio playback.
- Graphics and animation. Games, editing tools, anything where the frame rate must hold under load.
- The platform’s newest features. If you need something Apple or Google shipped this month, support in React Native arrives later.
When in doubt, the question is not whether React Native can do it, because with a native module it can do almost anything. The question is how much of the app ends up native anyway. If the answer is a large share, you have two codebases plus extra complexity rather than one.
What sharing code means in practice
Business logic, network calls, data models, state and most of the interface are shared. That is the bulk of an ordinary app, which is why the one-codebase promise broadly holds.
What is not shared: push notifications, deep links, payments, file handling, permissions, and anything touching the system’s own dialogs. Each needs setting up on both platforms and testing on both. None are hard, but they exist, and they are routinely missing from the estimate.
Where React Native costs extra
Native modules
If the app needs something with no ready-made package, somebody writes it in Swift and Kotlin. That is ordinary work, but it requires people with exactly those skills, and it is worth establishing before the technology is chosen.
Upgrades
React Native moves quickly and the packages you depend on do not always keep pace. Budget for an upgrade at least once a year. Skip it for three years and the fourth upgrade becomes a project of its own.
Performance in long lists
Long lists with images and complex rows are the classic place a React Native app feels slower than a native one. It is solvable, but it takes someone who knows how, and testing on a cheap Android handset rather than only a new iPhone.
What you save
A first release is rarely half the cost of two native apps. Budget for 60 to 75 per cent, because setup, testing and release still happen in two places.
The saving arrives afterwards. Every new feature is built once. Every fix is made in one place. Across two or three years of continuous development the difference becomes obvious, and that is where the decision should be justified.
How to start sensibly
Pick the three hardest screens and build those first. Not login and a list, but whatever you are least sure about. Test on the oldest handset your users realistically carry. Then decide.
It is the same approach we use in MVP development: resolve the uncertain parts while changing direction is still cheap. Where the app will be built and run over time, we usually put a dedicated development team on it so the knowledge stays in one place.
If you need people with this specific experience, you can hire React Native developers from us, or look more broadly at our mobile development services and mobile developers if the technology is still open.
Frequently asked questions
Rarely, when it is built properly. What users notice is long lists that stutter and transitions that are not smooth. Both are fixable, but both need testing on ordinary handsets rather than only the developer’s own.
Not directly. Business logic and the data layer can often be shared with a web app, but the interface has to be built separately. Do not budget for three platforms at the price of one.
Flutter solves the same problem and solves it well. The deciding factor is usually what your team and your market can staff. If you already have React developers, React Native is the shorter path.
An app with login, one system integration and ten to fifteen screens typically lands at three to five months including testing and release. Integrations with older systems are the factor that most often moves the schedule.
What we would do
React Native fits when the app is about data and business logic rather than hardware and graphics. The saving lies in the years after launch, not the first release. Build the hardest screens first, test on old hardware, and decide on that.
Want us to look at your app? Get in touch and we will give you an honest view on whether React Native is the right choice.
