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Building Standalone Apps
The purpose of this guide is to help you create standalone binaries of your Expo app for iOS and Android which can be submitted to the Apple App Store and Google Play Store.
An Apple Developer account is needed to build an iOS standalone app, but a Google Play Developer account is not needed to build the Android standalone app. If you'd like to submit to either app store, you will need a developer account on that store.
It's a good idea to read the best practices about Deploying to App Stores to ensure your app is in good shape to get accepted into the Apple and Google marketplaces. We can generate builds for you, but it's up to you to make your app awesome.
1. Install exp
XDE currently doesn't include an option for building a standalone app, so we'll need exp for this. Run npm install -g exp to get it.
If you haven't used exp before, the first thing you'll need to do is login with your Expo account using exp login.
Windows users must have WSL enabled. We recommend picking Ubuntu from the Windows Store. Be sure to Launch Ubuntu at least once. After that, use an Admin powershell to run:Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux
The iOS bundleIdentifier and Android package fields use reverse DNS notation, but don't have to be related to a domain. Replace "com.yourcompany.yourappname" with whatever makes sense for your app.
You're probably not surprised that name, icon and version are required.
The sdkVersion tells Expo what Expo runtime version to use, which corresponds to a React Native version. Although "XX.0.0" is listed in the example, you already have an sdkVersion in your app.json and should not change it except when you want to update to a new version of Expo.
There are other options you might want to add to app.json. We have only covered what is required. For example, some people like to configure their own build number, linking scheme, and more. We highly recommend you read through Configuration with app.json for the full spec. This is also your last chance to double check our recommendationsfor App Store metadata.
3. Start the build
Run exp build:android or exp build:ios. If you don't already have a packager running for this project, exp will start one for you.
If you choose to build for Android
The first time you build the project you will be asked whether you'd like to upload a keystore or have us handle it for you. If you don't know what a keystore is, just leave it to us. Otherwise, feel free to upload your own.
[exp] No currently active or previous builds for this project.
Would you like to upload a keystore or have us generate one for you?
If you don't know what this means, let us handle it! :)
1) Let Expo handle the process!
2) I want to upload my own keystore!
Note: If you choose the first option and later decide to upload your own keystore, we currently offer an option to clear your current Android keystore from our build servers by running exp build:android --clear-credentials.This is irreversible, so only run this command if you know what you are doing! You can download a backup copy of the keystore by running exp fetch:android:keystore. If you do not have a local copy of your keystore , you will be unable to publish new versions of your app to the Play Store. Your only option would be to generate a new keystore and re-upload your application as a new application. You can learn more about how code signing and keystores work in the Android documentation.
If you choose to build for iOS
You are given a choice of letting the exp client create the necessary credentials for you, while still having a chance to provide your own overrides. Your Apple ID and password is used locally and never saved on Expo's servers.
[exp] Making sure project is set up correctly...
[exp] Your project looks good![exp] Checking if current build exists...
[exp] No currently active or previous builds for this project.
? How would you like to upload your credentials?
(Use arrow keys)
❯ Expo handles all credentials, you can still provide overrides
I will provide all the credentials and files needed, Expo does no validation
We ask you if you'd like us to handle your distribution certificate or use your own. Similar to the Android keystore, if you don't know what a distribution certificate is, just let us handle it for you. If you do need to upload your own certificates, we recommend followingthis excellent guide on making a p12file.Note: this guide recommends leaving the p12's password blank, but a p12 password is required to upload your own certificate to Expo's service. Please enter a password when prompted.
Note: The Expo build service supports both normal App Store distribution as well as enterprise distribution. To use the latter, you must be a member of the "Apple Developer Enterprise Program". Only normal Apple developer accounts can build apps that can be submitted to the Apple App Store, and only enterprise developer accounts can build apps that can be distributed using enterprise distribution methods. When you call exp build:ios, use the --apple-enterprise-account flag. At this time, the standalone app builder does not support "ad hoc" distribution certificates or provisioning profiles.
4. Wait for it to finish building
We'll print a url you can visit (such as expo.io/builds/some-unique-id) to watch your build logs. Alternatively, you can check up on it by running exp build:status. When it's done, you'll see the url of a .apk (Android) or .ipa (iOS) file -- this is your app. Copy and paste the link into your browser to download the file.
Note: We enable bitcode for iOS, so the .ipa files for iOS are much larger than the eventual App Store download available to your users. For more information, see App Thinning.
5. Test it on your device or simulator
You can drag and drop the .apk into your Android emulator. This is the easiest way to test out that the build was successful. But it's not the most satisfying.
To run it on your Android device, make sure you have the Android platform tools installed along with adb, then just run adb install app-filename.apk with USB debugging enabled on your device and the device plugged in.
To run it on your iOS Simulator, first build your expo project with the simulator flag by running exp build:ios -t simulator, then download the tarball with the link given upon completion when running exp build:status. Unpack the tar.gz by running tar -xvzf your-app.tar.gz. Then you can run it by starting an iOS Simulator instance, then running xcrun simctl install booted <app path> and xcrun simctl launch booted <app identifier>.
To test a device build with Apple TestFlight, download the .ipa file to your local machine. You are ready to upload your app to TestFlight. Within TestFlight, click the plus icon and create a New App. Make sure your bundleIdentifier matches what you've placed in app.json.
Note: You will not see your build here just yet! You will need to use Xcode or Application Loader to upload your IPA first. Once you do that, you can check the status of your build under Activity. Processing an app can take 10-15 minutes before it shows up under available builds.
6. Submit it to the appropriate store
We don't automate this step (yet), but at this point you should be able to follow the Apple and Google documentation to submit your standalone binary to each respective store. For more info on how to polish your app and ensure it is accepted to the Apple and Google marketplaces, read the guide on Deploying to App Stores.
7. Update your app
For the most part, when you want to update your app, just Publish again from exp or XDE. Your users will download the new JS the next time they open the app. To ensure your users have a seamless experience downloading JS updates, you may want to enable background JS downloads. However, there are a couple reasons why you might want to rebuild and resubmit the native binaries:
If you want to change native metadata like the app's name or icon
If you upgrade to a newer sdkVersion of your app (which requires new native code)
To keep track of this, you can also update the binary's versionCode and buildNumber. It is a good idea to glance through the app.json documentation to get an idea of all the properties you can change, e.g. the icons, deep linking url scheme, handset/tablet support, and a lot more.
If you run into problems during this process, we're more than happy to help out! Join our Forums and let us know if you have any questions.