Being able to build your app on your own hardware is a relatively fundamental feature of any application software framework. The Expo framework is free and open source and we consciously keep it decoupled from Expo Application Services (EAS), which is a suite of hosted services we manage.

Two of the ways to build your app are: - Entirely locally, without EAS: generate your native Android and iOS projects with "npx expo prebuild:{android,ios}" and build your app with Android Studio/Gradle and Xcode/xcodebuild, respectively. - With EAS: after getting set up with EAS, installing EAS CLI, and configuring eas.json, run "eas build". There is also a "--local" flag that runs the compilation steps locally and uses your signing credentials managed by EAS.

Many developers use a mix. For instance, they'll build locally when working on a feature for a fast feedback loop. And they'll use EAS to build their release candidates and PR previews to share with their team.