OPEN SOURCE

Built for teams and agents to ship faster

From core libraries to AI agent infrastructure, our open source work helps teams build better apps and gives agents the tools they need to work inside your codebase.

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Book consultation
50M+
Downloads / month
300+
React Native commits
67K+
GitHub stars
150+
OSS Projects
Used across production apps
Teams use our libraries every month to build, test, release, and improve React Native products at real high-trafficproduction scale.
Part of the React Foundation
We help shape the framework your mobile products depend on. Our open source sits close to the decisions behind React Native.
Maintained with the community
These projects grow through real usage, contributor feedback, and engineers who ship production React Native apps every day.
The stack for AI-native delivery
From core libraries to agent infrastructure, our projects give teams and agents the tools to work inside real codebases.
Open source

Tools for teams and agents.

From core React Native libraries to agent infrastructure, these projects help engineers and AI agents inspect, validate, automate, and ship real apps.
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Project
Function
Downloads/mo
Stars
React Native Testing Library
Simple and complete React Native testing utilities that encourage good testing practices
18213348
3420
Testing
React Native Community CLI
Command line tools to help you build React Native apps
13461337
2938
Infrastructure
React Native Slider
React Native component exposing Slider from iOS and SeekBar from Android
5990033
1429
UI
React Native Pager View
React Native wrapper for the Android ViewPager and iOS UIPageViewController
5528261
3365
UI
Re.Pack
A webpack-based toolkit to build your React Native application with full support of webpack ecosystem
2184941
1945
Infrastructure
React Native Paper
Material Design for React Native (Android & iOS)
1999981
14468
UI
React Native Builder Bob
Simple set of CLIs to scaffold and build React Native libraries for different targets
1375553
3232
Infrastructure
Agent Device
CLI to control iOS and Android devices for AI agents
980427
4982
Agents
Rozenite
Plug-and-play panels for React Native DevTools. Install, enable, and start debugging in minutes.
959764
663
Testing
Reassure
Performance testing companion for React and React Native
583703
1484
Testing
Liquid Glass
iOS Liquid Glass in React Native
539196
1706
UI
React Native Bottom Tabs
Native Bottom Tabs for React Native
408757
1461
UI
Agentic Delivery

Turn AI into better software delivery.

From redesigning development workflows to building custom agents, testing their output, and choosing the right models, we turn AI into a practical part of product delivery.

Agentic Delivery
Book consultation
AI SDLC Advisory
AI-Driven QA & Testing
Custom Agents
Custom & Private Models
Events

Meet the engineers behind the work.

Join talks, workshops, and live sessions from the people building React Native, open source tools, and AI-native delivery workflows.
Explore Events
Insight Page
Meetup
Amsterdam

From Design to Shipped: A Modern App Development Meetup

Join Callstack, JetBrains, and Expo in Amsterdam on October 22 for talks on AI agents, UI development, and verification across web and mobile.
Insight Page
Talk
New York, United States

Efficient On-Device LLMs in React Native Done Right

Artur Morys-Magiera will cover efficient on-device LLMs in React Native, including runtimes, model selection, quantization, and platform constraints.
Insight Page
Talk
New York, United States

On-Device AI After WWDC: What Changed for React Native

Mike Grabowski will explain what changed for system-provided on-device AI after WWDC and what React Native developers can build with it.
Insight Page
Talk
New York, United States

Beyond Coding Agents: Making ADLC Work Across Platforms

Mike Grabowski will explain how to close the full agentic development lifecycle across mobile, web, and native platforms.
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Agent Conf

warsaw / Poland

17–18/09/2026

Cross the threshold into agentic development.

Two days in Warsaw with the engineers designing, debugging, orchestrating, and adopting agents in real software teams.

Buy ticket
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discord

Talk agents, apps, and open source.

Join the Callstack Discord to discuss React Native, AI-native workflows, agent tooling, bugs, ideas, and contributions.

Join Callstack Discord