React Native or native: what fits your app?

The choice between React Native and native development is, at its core, a choice between one codebase and two. That sounds technical, but the consequences are economic: two codebases mean nearly double the build, double the maintenance, and often double the team, every year the app lives. Here’s the trade-off, with cost and risk in focus.

One codebase instead of two

A native effort means the same feature gets built twice: once in Swift for iOS, once in Kotlin for Android. Two implementations have to be kept in sync, tested separately, and released in step. With React Native, business logic, interface, and flows are written once and run on both platforms, with the platform’s real components underneath.

That affects more than the development budget. A shared team works against one backlog instead of two, features ship simultaneously on iOS and Android, and bugs get fixed in one place.

Risk also drops in a less obvious way: parity. With two codebases, it’s common for the platforms to drift apart – a feature exists on iOS but not Android, a bug is fixed in one place but not the other. That leads to double testing, double documentation, and confused users. With shared code, there’s, by definition, a single source of truth.

The savings: typically 25–40 percent

A common saving with a shared codebase is 25–40 percent compared with double native development. It doesn’t reach 50 percent because some work stays platform-specific: store releases, certain testing, and the occasional per-platform customization.

A worked example: a medium-complexity app, accounts, its own backend, push, and payment, that would cost around SEK 1.5 million to build natively for both platforms often lands around SEK 0.9–1.1 million with React Native. And the saving repeats after launch: maintenance is usually estimated at 15–25 percent of the development cost per year, so a lower base cost and a single codebase give a lower annual cost across the app’s entire lifespan.

When native wins

React Native isn’t the right answer everywhere. Native development earns its price when any of the following is at the core of the product:

• Heavy graphics and animation. Games, advanced image processing, or 3D experiences want to talk directly to the platform’s graphics APIs.
• Hardware-close features. Deep integration with Bluetooth protocols, background sensors, AR, or specialized peripherals is often simpler and more stable fully native.
• Platform-specific UX. If the app needs to feel like an extension of the operating system, with every platform convention rendered perfectly, two native codebases give the most control.
• Extreme performance demands. Real-time audio, video pipelines, and similar niches measure latency in milliseconds and can’t tolerate any middle layer.

If you don’t recognize your app in the list, that’s a strong sign the shared codebase is the right starting point.

Native modules: the middle path most people forget

The choice is rarely binary. React Native has a built-in release valve: native modules. If a single feature requires platform code, a payment terminal SDK, an unusual sensor, a performance-critical calculation, just that part gets written in Swift and Kotlin and plugged into the shared app.

For the budget, that means a special requirement becomes a contained line item of maybe a few weeks’ work, instead of an argument for doubling the whole project. In practice, the choice comes down to where the app’s center of gravity lies: if it’s mostly flows, lists, and forms with the occasional special case, React Native with modules is right; if it’s mostly special cases, native is right.

How to choose

Three checkpoint questions go a long way: Does the app need to go on both iOS and Android? Is the core feature something an ordinary business app does, or something from the list where native wins? What does your long-term staffing look like, one team or two? For most business apps, the answers point the same direction, and when they don’t, a short technical assessment is cheaper than a wrong choice.

At Weapp, we build apps in React Native precisely because the math usually lands there for Swedish product companies, but we recommend native when the product requires it. Tell us about your app via the contact page or read more about our services, and you’ll get an honest assessment before you lock in the technology.