Share your business logic across every platform without rewrites
We help you build a shared core library in C++ or Rust that powers your apps across mobile, web, desktop, and TV. Write your business logic once; deploy it everywhere.
Why implement a shared native core instead of separate codebases?
Maintaining the same logic in Swift, Kotlin, TypeScript, and other languages creates drift, bugs, and wasted effort. A shared core keeps your business rules consistent and your teams efficient.
One source of truth
Business logic lives in one place. No more bugs from implementations getting out of sync.
One source of truth
Business logic lives in one place. No more bugs from implementations getting out of sync.
Native code shared across all platforms
Your C++ business logic compiles once and runs everywhere: iOS, Android, web, desktop, with no per-platform rewrites.
Native code shared across all platforms
Your C++ business logic compiles once and runs everywhere: iOS, Android, web, desktop, with no per-platform rewrites.
Technology flexibility
Use any UI framework you want: React Native, native iOS/Android, web, desktop, with the same core underneath.
Technology flexibility
Use any UI framework you want: React Native, native iOS/Android, web, desktop, with the same core underneath.
A production-ready shared core that powers all your platforms
High-quality native implementation of your business logic with build pipelines and integrations for every platform you support.
Native implementation
Your business logic implemented in C++ or Rust for maximum performance and portability.
React-first integration
First-class bindings for React and React Native that feel native to the programming model.
Multi-platform support
Working integrations for iOS, Android, web, desktop, TV, and other platforms you need.
CI/CD pipelines
Automated workflows to build, test, and publish your shared core to all platform package managers.
Cross-platform testing
Test suites that verify behavior consistency across all target platforms.
Long-term maintainability
Production-ready structure and engineering standards so your team can evolve the shared core safely over time.
From File I/O to Real-Time Native Audio Pipelines
This deep dive explains how to move from file-based audio workflows to in-memory buffers for lower latency and higher throughput in React Native.
- Process audio in memory instead of bouncing through files.
- Use JSI and ArrayBuffer for efficient native-to-JS transfer.
- Build predictable real-time pipelines for advanced audio features.
Build shared native cores that power apps across every platform
Implement your business logic in native code
We write your core logic in C++ or Rust, optimized for performance and cross-platform reuse.
Integrate with React and React Native
We create bindings that work naturally with the React programming model.
Set up cross-platform build pipelines
We configure CI/CD to build, test, and publish to iOS, Android, web, and other platform repositories.
Support migration and long-term maintenance
We help teams migrate to shared core architecture and maintain it as a production-ready solution.
Ready to share your business logic across all platforms?
Why leading companies work with Callstack
Meta Official Partners
We are official Meta partner for React Native, co-organizers of React Conf and hosts of React Universe Conf.
Working at scale
We know how to make React Native work at enterprise scale, both technically and organizationally.
React Native Core Contributors
We don’t just use React Native to build cross-platform apps, we help shape it for millions of developers.
Team at scale
We’re a team of 200+ engineers ready to start fast and scale with your needs.
Enterprise-friendly
We hold ISO certifications and follow strict security standards to make onboarding smooth and compliant.
Wide range of services
As a partner for your full application lifecycle, we offer a full range of services around React and React Native.
FAQs
Shared native cores raise questions about architecture, migration, and maintenance. Here are answers to the ones we hear most.
Both work well. We recommend based on your team's expertise, existing code, and specific requirements.
The core handles shared logic; platform-specific code stays in the UI layer where it belongs.
Yes. We often help teams migrate to shared core piece by piece, starting with the highest-value logic.
We set up tooling and practices that make cross-platform debugging manageable.
The shared core integrates as native modules. Your existing React Native code calls it like any other module.
Minimal. Native code is fast, and we optimize the JavaScript-to-native bridge for efficiency.
Ready to share your business logic across all platforms?
We build shared native cores that power iOS, Android, web, and desktop apps from a single codebase. One implementation, every platform, 80%+ code reuse.
We’ve helped dozens of teams go cross-platform without rewriting everything. Let's see how we can help you.
