Cross-platform mobile architecture is often reduced to one question:
Which framework lets us share the most code?
At scale, that is usually the wrong metric.
Native, Flutter, React Native, and Kotlin Multiplatform place the shared boundary at different layers—UI, rendering, application logic, domain behaviour, and platform integration.
The more important decision is determining which behaviour must remain consistent and which capabilities require independent Android and iOS control.
A shared implementation still depends on platform lifecycles, native SDKs, release pipelines, backend compatibility, and production observability.
The largest risks are rarely visible in a prototype. They emerge through plugin ownership, state restoration, background execution, dependency upgrades, asymmetric rollouts, and unclear responsibility across shared and native layers.
The goal is not maximum code reuse.
It is to share behaviour where inconsistency is costly while retaining platform control where operational differences matter.
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