Host Platform

Also called Platform, Host

Part of
React Native Glossary
Related
Core ComponentsPlatform-Specific CodeFabric RendererNative Module
Mentioned in
Out-of-Tree Platform
Updated

What is Host Platform in React Native?

The host platform is the operating system embedding React Native — iOS, Android, macOS, Windows, tvOS or the web — and the source of the real views your components render to.

iOSUIViewMetaAndroidViewGroupMetaWeb<div>React Native WebWindowsXAML panelMicrosoftmacOSNSViewMicrosoft<View>
Your componentHost platformRendering to this hostReact Native is platform-agnostic: the host platform supplies the real views, the threads and the APIs. A View is not one thing but a host component, resolved to a UIView on iOS, a ViewGroup on Android, a div with React Native Web, and native views on Windows and macOS. Meta maintains iOS and Android; Microsoft maintains Windows and macOS, and partners maintain tvOS, visionOS and the web. Handle differences with Platform or platform files, and reach what React Native does not wrap with a native module.

The host platform is whatever operating system is hosting your React Native app and providing the real UI widgets it renders into. React Native itself is platform-agnostic; the host supplies the views, the threading model, and the APIs.

The supported hosts split into two groups:

  • Maintained by Meta — iOS and Android.
  • Maintained by partners — macOS and Windows by Microsoft, tvOS, and visionOS, plus React Native Web for the browser.

The concept matters because it explains React Native's core promise and its main caveat. A <View> is not one thing: it is a host component resolved to a UIView, a ViewGroup, or a <div> depending on where it runs. Shared code describes intent; the host decides the pixels.

You handle host differences with the Platform module or platform-specific files, and you reach host capabilities that React Native does not wrap through a native module.