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Summary: [Re: RedBox screen is a bit scary - Discussions and Proposals](https://github.com/react-native-community/discussions-and-proposals/issues/42) Per hramos: > The RedScreen was inspired by Ruby on Rails's error screen > I do see the RedBox screen could be made less jarring while still successfully displaying all the information we need. Hence jamonholmgren came up with the idea that only the header & footer of the RedBox screen could be red. This makes the content a bit more readable as well as makes the screen a little less intimidating. Also frantic made the suggestion that since the bottom buttons are not as important, they don't need to stand out. Hence only the header of the RedBox screen which displays the error is made red. Screenshots: ---------- <div style="flex-direction: row"> <img width="325" alt="orginal" src="https://user-images.githubusercontent.com/7840686/48322916-b4958b80-e5de-11e8-9276-33378d1b41c5.png"> <img width="320" alt="redbox_v2_ios" src="https://user-images.githubusercontent.com/7840686/48665300-cce32b80-ea60-11e8-8e8f-88f74bad30ca.png"> </div> <div style="flex-direction: row"> <img width="300" alt="original_android" src="https://user-images.githubusercontent.com/7840686/48322958-d5f67780-e5de-11e8-891c-1b20bd00e67b.png"> <img width="300" alt="redbox_v2_android" src="https://user-images.githubusercontent.com/7840686/48665312-f13f0800-ea60-11e8-9fb6-47e03c809789.png"> </div> Pull Request resolved: https://github.com/facebook/react-native/pull/22242 Reviewed By: hramos Differential Revision: D13564287 Pulled By: cpojer fbshipit-source-id: fcb6ba5e20d863f4b957d20f3787f5b7a365bfdb
React Native · 
Learn once, write anywhere: Build mobile apps with React.
See the official React Native website for an introduction to React Native.
Requirements
Supported target operating systems are >= Android 4.1 (API 16) and >= iOS 9.0. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS by default (tools like Expo can be used to get around this).
Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
How React Native works
React Native lets you build mobile apps using JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components.
With React Native, you don't build a "mobile web app", an "HTML5 app", or a "hybrid app". You build a real mobile app that's indistinguishable from an app built using Objective-C, Java, Kotlin, or Swift. React Native uses the same fundamental UI building blocks as regular iOS and Android apps. You just put those building blocks together using JavaScript and React.
React Native lets you build your app faster. Instead of recompiling, you can reload your app instantly. With hot reloading, you can even run new code while retaining your application state.
React Native combines smoothly with components written in Objective-C, Java, Kotlin, or Swift. It's simple to drop down to native code if you need to optimize a few aspects of your application. It's also easy to build part of your app in React Native, and part of your app using native code directly - that's how the Facebook app works.
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. You can learn more about our open source roadmap in this blog post: Open Source Roadmap.
Full documentation
The full documentation for React Native can be found on our website. The source for the React Native documentation and website is hosted on a separate repo, https://github.com/facebook/react-native-website. Releases are discussed in the React Native Community, https://github.com/react-native-community/react-native-releases, and larger discussions and proposals are in https://github.com/react-native-community/discussions-and-proposals.
The React Native documentation only discusses the components, APIs, and topics specific to React Native (React on iOS and Android). For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
Join the React Native community
- Website: https://facebook.github.io/react-native
- Twitter: https://twitter.com/reactnative
- Help: https://facebook.github.io/react-native/en/help
See the CONTRIBUTING file for how to help out.
License
React Native is MIT licensed, as found in the LICENSE file.
React Native documentation is Creative Commons licensed, as found in the LICENSE-docs file.