React Foundation
used by 20m+ developers
100+ Enterprise Clients
One partner for product, agents, adoption, and governance.
Callstack combines agent-driven development with deep cross-platform expertise, enabling teams to ship faster across mobile, web, and TV with React Native.
AI-native delivery starts here. Pick where to start.
Agentic delivery, led by Core Contributors
The fastest way to ship React Native products
For over a decade, we've delivered React Native for teams with demanding production requirements. Today, we pair that expertise with custom AI Agents, so you ship more.
6x productivity gap. AI power users vs everyone else.
OpenAI / Enterprise usage analysis
We had been struggling with React Native application performance until we met Callstack.
Turn AI output into faster product delivery
Infrastructure built for AI-native delivery
Agentic development only works when the infrastructure around it can keep up. The right delivery stack turns more agent output into faster engineering and smoother releases.
AI increases output, testing and review are bottlenecks.
GitLab / Global DevSecOps Report
Their engineers proved to be a crucial part of our mobile app relaunch project.
Make AI an advantage, not a subscription
Build an AI-native engineering team
Stop guessing the ROI of your AI tools. We configure the right stack, train your team to use it effectively, and measure the direct impact on delivery.
80% companies report no productivity gains from AI.
National Bureau of Economic Research
The trainers are always very helpful and supportive. It really makes a difference!
AI has to pass more than code review
Adopt AI under enterprise constraints.
AI gets harder to use when security, compliance, and data handling requirements shape the path to production. Enterprise teams need a setup that fits those conditions.
80% of executives expect to fail an AI governance audit.
Grant Thornton / AI Impact Survey
I recommend them as a trusted tech partner for running complex projects.
WHY CALLSTACK
AI is changing product delivery.
Work with the team shaping the tools behind it.
Part of the React Foundation
The world's most popular frameworks for AI-native apps are React and React Native. We're part of the team building them.
Used by AI agents worldwide
We build open-source infrastructure that helps AI agents inspect, control, and improve mobile applications.
Trusted at enterprise scale
We have spent 10+ years helping large organizations ship, modernize, and scale complex cross-platform products.
Case studies
What shipping at AI speed looks like
Trusted by enterprise teams at scale
Their engineers proved to be a crucial part of our mobile app relaunch project.
I recommend them as a trusted tech partner for running complex projects.
The trainers are always very helpful and supportive. It really makes a difference!
I appreciate their attention to detail, flexible approach and a high degree of expertise.
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We had been struggling with React Native application performance until we met Callstack.
Not only does Callstack have tremendously talented engineers, but I know they care about the success of the project as much as I do.
Worth your time, by engineers.
React Native Wrapped 2025: A Month-by-Month Recap of The Year
The first edition of React Native Wrapped looks back at the year RN turned 10 and the ecosystem doubled down on the New Architecture. It provides a month-by-month record of 2025, covering major framework releases, the Legacy Architecture freeze, React 19 integration, and notable developments across tooling, performance, styling, native modules, Expo, and platform adoption.
Agent Conf
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How AI Is Changing React Native Development and Testing
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From Native to React Native for TV: The Zattoo Case
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AI-Supported Brownfield Migration to React Native
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