LEADING OPEN SOURCE

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

Check our projects

CALLSTACK 'S OPEN SOURCE PROJECTS

REACT NATIVE VISIONOS

Write visionOS with full support for platform SDK - full fork of the main repository with changes needed to support visionOS

REACT NATIVE VISIONOS

Write visionOS with full support for platform SDK - full fork of the main repository with changes needed to support visionOS

Reassure

Ensure your React components perform as intended as your app grows

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

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

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

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

Re-Pack

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

the React Native Core Partnership

We are official React Native partners and work closely with Meta, Microsoft, Expo, and others to advance this technology. We create and discuss proposals, suggest improvements, and maintain key components of the React Native ecosystem. Our team is also part of React Native's Release Crew.

Open Source Partners

(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.

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 maintain community repositories, and sponsor dedicated contributors. Our work doesn't stop in the online world, though. We bring the spirit of sharing to a real-life audience by connecting with developers at the events we organize: React Universe Conf and React Conf.

Sustaining Open Source: Our Approach to R&D

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 work.
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We 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.

Join our team