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Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.


Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

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Create React Native apps with no build configuration.




Create React Native App

npx create-react-native-app

Once you're up and running with Create React Native App, visit this tutorial for more information on building mobile apps with React.


  • Native project ready to be built on to your device.
  • Support for unimodules and auto-linking.
  • OTA updates, and Gestures out of the box.
  • Full support for React Native web.
  • Plug-n-play custom templates.
  • Works with the Expo Client app.


  • npx create-react-native-app Create a new native React app.
  • yarn ios -- (react-native run-ios) Build the iOS App (requires a MacOS computer).
  • yarn android -- (react-native run-android) Build the Android App.
  • yarn web -- (expo start:web) Run the website in your browser.


By default you create a bare-workflow React project with support for iOS, Android, and web. You can opt to use an example project instead by selecting the "Templates from ..." option. Custom templates can be used with --template <Example Name or GitHub URL> option.

  • Use an example: npx create-react-native-app -t with-typescript
  • Use a custom template: npx create-react-native-app --template -- Only works with GitHub repos on the master branch.
  • All examples can be modified in the expo/examples repo.


Usage with Expo Client App

Expo Client enables you to work with all of the Components and APIs in react-native, as well as the JavaScript APIs that the are bundled with the Expo App.

Expo Client supports running any project that doesn't have custom native modules added.

  • Download the "Expo Client" app from the Play Store or App Store.
  • Start your project with Expo
    • Install the CLI npm i -g expo-cli
    • Start the project expo start
  • Open the project:
    • Sign in to expo and the project will appear in the app.
    • Or point your phone's camera at the QR code in the terminal (press "c" to view it).

Support and Contact

If you're having issues with Create React Native App, please make sure:

  • The issue is not covered in the Expo Docs
  • There is not already an open issue for your particular problem

If you've checked the documentation and currently open issues, please either open a new GitHub issue or ask a question on Expo forums.


Please see Contributing guide in the Expo CLI monorepo for instructions on contributing to Expo CLI.


The examples feature was inspired by the templates system of create-next-app by the Vercel team.


Contributors ✨

All Contributors

Thanks goes to these wonderful people (emoji key):

This project follows the all-contributors specification. Contributions of any kind welcome!