OPEN SOURCE

Leading Open Source

We build, maintain and contribute to the most popular Open Source libraries. We contribute to the React Universe improving the developer experience for everyone.

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(Code) sharing is caring

Releasing a project as open source means that any developer is free to use, modify or distribute your work. Open Source libraries are available and configurable, so you can easily create your own custom elements.

Partnering with key players

We work closely with Meta, Microsoft, and Expo to provide the best support for the community. We comment and discuss proposals, suggest improvements and maintain some of the React Native core modules. Our team collaborates with the Meta team members on cutting a new React Native release to put it out there for developers to use.

Our React Native development company advocates code and knowledge sharing. We place a high priority on Open Source work - we create our own libraries, help to maintain community repositories, and sponsor dedicated contributors.

Open Source Partners

OPEN SOURCE PROJECTS

Take a look at some of our best-known Open Source projects:

Reassure

Ensure your React components perform as intended as your app grows

Paper

Cross-platform UI kit with customizable, production-ready components following Google's Material Design

React Native Testing Library

Lightweight testing solution for React Native components, promoting better testing practices

Linaria

Write CSS in JavaScript with zero runtime using this library. CSS is extracted to files during build

Re-Pack

A toolkit to build your React Native application with Rspack or Webpack.

And many more!
Check our projects on GitHub!

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Open Source &
R&D program

Since we truly value Open Source and understand the importance of active engagement in the community, we fully support Callstack developers in their Open Source contribution. We have a dedicated budget for their Open Source work.

We also invest in new exciting ideas within our internal R&D program. It lets us nurture innovation and foster a culture of continuous learning, sharing, and growth.