React Native Apps That Reuse What Your Team Already Knows

Yes, and this is often the best reason to pick it. You can ship new screens in React Native while the rest of the app stays native, which avoids the rewrite that usually kills these projects. It does mean maintaining the native build and the JavaScript layer together, so it's worth being deliberate about which screens move.

Yes. The New Architecture removed the old asynchronous bridge that caused most of the historic performance complaints, and it's used by large consumer apps. The risk worth planning for isn't the framework — it's dependency churn in the surrounding library ecosystem, which needs budgeted maintenance.

In practice they're close enough that performance rarely decides it. React Native uses real platform components, which helps it feel native; Flutter renders its own, which gives more control over custom interfaces. Your team's existing skills are a better tiebreaker than benchmarks.

Business logic, validation, API clients and types, yes — and that's where the real saving is. UI components mostly don't transfer, despite what the shared-React framing suggests, because mobile layout and interaction differ genuinely from the web.

You write a native module in Swift or Kotlin and call it from JavaScript. That's normal and expected for payment SDKs, hardware and newer OS APIs — just scope it as real native work rather than assuming a library exists.