The Tool Desk
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What is Expo, and what problem does it solve?
React Native lets developers build native Android and iOS apps using React and JavaScript or TypeScript. Expo builds on that foundation with an open-source framework, an SDK of native modules, command-line tools, Prebuild, and related development features. The framework also supports apps that run on the web. Expo’s core-concepts guide describes how these pieces fit together.
In practice, Expo brings common app-development capabilities and workflow tools into a project without making them a separate programming language or a replacement for React Native. A project can adopt one Expo package or several tools together. Using Expo does not mean that every Expo tool or service is required.
Does Expo replace React Native or require a separate platform?
No. An Expo app is a React Native app that uses Expo tools. You can write the app with React Native and use Expo for selected native modules or parts of the development workflow. Expo is not a separate language, and using the framework does not by itself require you to build or publish through Expo’s cloud services.
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Expo’s project guide introduces the framework as a way to start a React Native app. Its workflow overview explains the broader development options; the tools in a project depend on what that app needs.
What is Expo Go?
Expo Go is a prebuilt app that provides a ready-to-use runtime for learning and quick experiments. It contains a fixed set of native libraries, so it can run your project’s JavaScript when the native code it needs is already bundled in Expo Go.
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That fixed set is also the key limitation: Expo Go cannot gain a new native library just because you update your JavaScript bundle. If a project depends on native code that Expo Go does not include, you need a different runtime. See Expo’s development builds FAQ for the distinction.
Expo Go vs. development builds
A development build is your own app build, configured for your project. It can include project-specific native libraries and native configuration, so it is suited to ongoing app development rather than only trying JavaScript in a prebuilt runtime. Expo recommends development builds for production-oriented development; Expo Go remains useful for learning and quick prototypes. Expo’s introduction to development builds explains how they work.
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| Choice | Best fit | Native code and configuration | Development-cycle fit |
|---|---|---|---|
| Expo Go | Learning and quick experiments | Uses the fixed native libraries bundled in Expo Go; no project-specific native additions to that runtime | Quick to start, but not a complete fit when the app needs native dependencies outside its bundled set |
| Development build | Ongoing, production-oriented app development | Can include the project’s native libraries and app-specific configuration | Provides a runtime tailored to the project for development and the broader app lifecycle |
Choose Expo Go while learning or prototyping if its bundled native libraries cover what you need. Move to a development build when you need an unsupported native dependency, app-specific native configuration, or a production-oriented workflow.
Can you add Expo tools to an existing React Native app?
Yes. Expo tools can be adopted in an existing React Native project; starting a new app with Expo is not the only route. The exact integration depends on the project and the tools you want to add. Expo’s guide to using Expo with existing React Native apps covers that path.
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Is EAS the same as Expo, and is EAS mandatory?
No. Expo is the framework and tool ecosystem; Expo Application Services (EAS) is a complementary suite of services for tasks such as building, submitting, updating, hosting, and managing workflows. You can use Expo framework tools without using all—or any—EAS services. Expo’s EAS overview describes the suite.
EAS Build is one way to create installable Android and iOS binaries. It runs builds on hosted infrastructure. Alternatively, you can compile locally using the platform toolchains installed on your own machine. The choice is whether you want to manage those toolchains and build locally or use hosted builds; EAS Build is optional. See the EAS Build introduction for its role.
Quick Recap
| Build route | Where compilation happens | What you need to manage |
|---|---|---|
| Local build | Your machine | Install and maintain the relevant native platform toolchains |
| EAS Build | Hosted build infrastructure | Use Expo’s hosted build service rather than compiling on your own machine |
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