Expo vs React Native CLI

Expo is a framework and set of tools built around React Native.

It provides tools, libraries and services that can make React Native application development easier, especially when starting a project.

React Native
     ↓
   Expo
     ↓
Mobile Application

The React Native Community CLI is a command-line development workflow that creates React Native projects with native Android and iOS project files.

It provides developers with more direct control over the native projects when compared with a simplified managed workflow.

Expo applications are still React Native applications.

The React programming model, components, props, state and Hooks remain important when working with Expo.

React
  ↓
React Native
  ↓
Expo Tools / Libraries
  ↓
Mobile App

Expo can simplify many common React Native development tasks.

• Project creation
• Development workflow
• Access to many device features
• Testing on devices
• Application configuration
• Building and submitting applications

The Community CLI is useful when developers need direct access to the native Android and iOS projects.

This can be important when a project requires custom native code, native dependencies or detailed platform-specific configuration.

An Expo project can be created using the Expo project creation tools.

npx create-expo-app@latest

The command creates a new Expo-based React Native project.

After creating an Expo project, the development server can be started from the project directory.

cd my-app

npx expo start

The development server provides options for running and testing the application.

The React Native Community CLI can be used to create a project with native Android and iOS project directories.

npx @react-native-community/cli@latest init MyApp

The exact project creation command can change with React Native tooling versions, so always check the documentation for the version being used.

A Community CLI React Native project normally contains native project directories such as:

MyApp/
├── android/
├── ios/
├── src/
├── package.json
└── ...

These native directories can be edited when platform-specific configuration is required.

Expo projects can also contain the application source code and configuration required to develop a React Native application.

my-app/
├── app/
├── assets/
├── package.json
├── app.json
└── ...

The exact structure depends on the Expo project template being used.

Expo Go is a development app that can be used to quickly run compatible Expo projects on a physical device.

It can be useful for learning, prototyping and testing many common React Native features.

An Expo development build is a custom development version of the application that can include native libraries and configuration needed by the project.

Development builds are useful when an application needs capabilities that are not available in the standard Expo Go environment.

Expo is often associated with a workflow where Expo tools manage much of the native configuration and development process.

This can reduce the amount of native Android and iOS configuration that beginners need to handle directly.

With the Community CLI, developers have direct access to the native Android and iOS projects.

For example, Android-specific Gradle configuration and iOS-specific Xcode project configuration can be managed directly.

Using Expo does not mean that native development is impossible. Modern Expo projects can use native modules and development builds when additional native capabilities are required.

Expo also provides configuration and build tools that help manage native application settings.

Expo projects can use configuration files to describe application settings.

{
    "expo": {
        "name": "Student App",
        "slug": "student-app"
    }
}

The exact configuration depends on the Expo project and features being used.

Mobile applications often need platform-specific settings such as permissions, application identifiers and icons.

Expo provides configuration tools for many of these settings, while Community CLI projects allow direct editing of the native project configuration.

Expo projects commonly use Expo's package installation tools when adding Expo libraries.

npx expo install expo-camera

The command helps install a compatible version of the package for the project.

Some libraries require native Android or iOS code.

With Expo, development builds and the appropriate Expo configuration can be used when native dependencies are required.

With Community CLI, developers directly manage the native project and its dependencies.

Both workflows can be used to test React Native applications on physical devices.

Expo can provide a convenient development workflow, while Community CLI projects can be installed and run through the standard Android and iOS development tools.

React Native applications can be tested on an Android emulator.

An emulator provides a virtual Android device on the development computer.

Both Expo development builds and Community CLI projects can be tested using Android development tools.

On macOS, React Native applications can be tested using the iOS Simulator.

The simulator is provided as part of Apple's development tools.

The exact setup depends on the selected React Native workflow and development environment.

Expo provides EAS Build as a service for creating application builds for supported platforms.

A typical workflow can look like:

React Native Code
       ↓
    Expo Project
       ↓
     EAS Build
       ↓
Android / iOS Build

Community CLI projects can be built using the native Android and iOS toolchains.

Android applications can use Gradle-based builds, while iOS applications use Apple's Xcode-based development and build tools.

Expo can be useful when you want:

• Simple project setup
• Quick development workflow
• Easy access to many common Expo libraries
• Convenient device testing
• Managed build services
• Less initial native configuration

The Community CLI can be useful when you need:

• Direct native project access
• Custom native Android code
• Custom native iOS code
• Detailed native configuration
• Direct control over native build systems

For beginners, Expo can provide a convenient way to start learning React Native because it reduces the amount of native configuration required at the beginning.

However, students should also understand the Community CLI workflow because professional projects can require direct native configuration.

JavaScript
    ↓
React
    ↓
React Native
    ↓
Expo Basics
    ↓
Components
    ↓
Styling
    ↓
Navigation
    ↓
APIs
    ↓
Storage
    ↓
Device Features
    ↓
Development Builds
    ↓
Native Android / iOS Concepts
    ↓
Production Build

This approach allows students to learn mobile development gradually while understanding both the convenient and native development workflows.

The main idea is simple:

Expo
 ↓
Simplified React Native Development
 ↓
Tools + Libraries + Build Services


Community CLI
 ↓
Direct React Native Development
 ↓
Android / iOS Native Projects

Both approaches are part of the React Native ecosystem. The choice depends on the project's requirements, especially the amount of native control and configuration required.