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.
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
- Feature Development
- End-to-End Product Development
- AI-Assisted Migrations
- Architecture, Performance & Modernization
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
- AI-Driven QA + Testing
- Custom Agents
- Self-Hosted CI/CD
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
- Tooling Setup
- Adoption Measurement
- Team Training
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
- Custom + Private Models
- Regulatory Compliance
- AI Security + Audits
I recommend them as a trusted tech partner for running complex projects.
Why teams bet on Callstack
From billion-user apps to React Native core, this is why teams choose Callstack when they need to move fast and get it right.
10 years in React Native. Now shaping agentic engineering.
For a decade, we have helped define how teams ship with React Native. Now we are helping shape how they work with agents.
Founded in 2016 ·Backed by Viking Global Investors
100+ Enterprise clients with 7B+ users.
We work with teams shipping at real scale. You get a partner used to high-stakes products, not learning on your roadmap.
React Foundation members. Core Contributors.
We are founding members of React Foundation and Core Contributors to React Native. You get direct access to people close to the decisions shaping the frameworks you use.
Open source since 2016. Our code runs in your app.
We contribute to React Native and maintain libraries across its ecosystem. Our code runs in apps used by millions of people every day.
20M+
Downloads / month10K+
GitHub stars250+
React Native commitsAgent Conf. The conference for the Agentic era.
The conference we built for the shift from writing code to orchestrating agents.
We are Codex Ambassadors.
We run meetups, workshops, and hands-on sessions that help teams learn Codex and apply it in real work.
Case studies
What shipping at AI speed looks like
Trusted by enterprise teams at scale
Not only does Callstack have tremendously talented engineers, but I know they care about the success of the project as much as I do.
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!
Their engineers proved to be a crucial part of our mobile app relaunch project.
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.
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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Profile React Components in React Native Release Builds
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