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What is Expo?

Exponent lets web developers build truly native apps that work across both iOS and Android by writing them once in just JavaScript.
Expo is a tool in the Cross-Platform Mobile Development category of a tech stack.
Expo is an open source tool with 10.7K GitHub stars and 1.7K GitHub forks. Here’s a link to Expo's open source repository on GitHub

Who uses Expo?

78 companies reportedly use Expo in their tech stacks, including lido, tools, and useinsider.

210 developers on StackShare have stated that they use Expo.
Public Decisions about Expo

Here are some stack decisions, common use cases and reviews by companies and developers who chose Expo in their tech stack.

Vishal Narkhede
Vishal Narkhede
Javascript Developer at getStream.io · | 19 upvotes · 311.7K views

Recently, the team at Stream published a React Native SDK for our new Chat by Stream product. React Native brings the power of JavaScript to the world of mobile development, making it easy to develop apps for multiple platforms. We decided to publish two different endpoints for the SDK – Expo and React Native (non-expo), to avoid the hurdle and setup of using the Expo library in React Native only projects on the consumer side.

The capability of style customization is one a large deal breaker for frontend SDKs. To solve this, we decided to use styled-components in our SDK, which makes it easy to add support for themes on top of our existing components. This practice reduces the maintenance effort for stylings of custom components and keeps the overall codebase clean.

For module bundling, we decided to go with Rollup.js instead of Webpack due to its simplicity and performance in the area of library/module providers. We are using Babel for transpiling code, enabling our team to use JavaScript's next-generation features. Additionally, we are using the React Styleguidist component documentation, which makes documenting the React Native code a breeze.

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Sezgi Ulucam
Sezgi Ulucam
Developer Advocate at Hasura · | 7 upvotes · 451.3K views

I've recently switched to using Expo for initializing and developing my React Native apps. Compared to React Native CLI, it's so much easier to get set up and going. Setting up and maintaining Android Studio, Android SDK, and virtual devices used to be such a headache. Thanks to Expo, I can now test my apps directly on my Android phone, just by installing the Expo app. I still use Xcode Simulator for iOS testing, since I don't have an iPhone, but that's easy anyway. The big win for me with Expo is ease of Android testing.

The Expo SDK also provides convenient features like Facebook login, MapView, push notifications, and many others. https://docs.expo.io/versions/v31.0.0/sdk/

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Rafael  Zerbini
Rafael Zerbini
CTO | Full Stack Dev at Simplifica · | 4 upvotes · 15.3K views
Shared insights

We use Expo because it makes the development smoothly and avoids dealing with android and ios files, what helps with the time spent on those configurations. The framework has advanced a lot and now can be used in small productions without any problem, we have not yet had the need to eject the project, and is already in production

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Expo Alternatives & Comparisons

What are some alternatives to Expo?
React Native
React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React. The focus of React Native is on developer efficiency across all the platforms you care about - learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue investing in React Native.
Free and open source, Ionic offers a library of mobile and desktop-optimized HTML, CSS and JS components for building highly interactive apps. Use with Angular, React, Vue, or plain JavaScript.
Create React Native App
Create React Native App allows you to work with all of the Components and APIs in React Native, as well as most of the JavaScript APIs that the Expo App provides.
Flutter is a mobile app SDK to help developers and designers build modern mobile apps for iOS and Android.
Xamarin’s Mono-based products enable .NET developers to use their existing code, libraries and tools (including Visual Studio*), as well as skills in .NET and the C# programming language, to create mobile applications for the industry’s most widely-used mobile devices, including Android-based smartphones and tablets, iPhone, iPad and iPod Touch.
See all alternatives

Expo's Followers
303 developers follow Expo to keep up with related blogs and decisions.
Edoardo Viviani
Gianluca TappatĂ 
Alexi Sanchez
Niels Brinch
Carlos Avalos
Eric Brown
Brian Pina