Callstack • Feb 7, 2025

Bringing WebAssembly to React Native with Polygen

Article Summary

Callstack just dropped Polygen, bringing WebAssembly to React Native. This could change how we think about performance-critical code in mobile apps.

WebAssembly has been a game-changer for web performance, but it's been largely missing from the React Native ecosystem. Callstack's new tool, Polygen, aims to bridge that gap by enabling developers to run high-performance WebAssembly modules directly in React Native apps across iOS and Android.

Key Takeaways

Polygen enables WebAssembly execution in React Native apps
Opens door to reusing existing Wasm libraries in mobile
Targets compute-heavy tasks like image processing and cryptography
Works across iOS and Android with unified API

Critical Insight

Polygen brings WebAssembly's performance benefits to React Native, unlocking new possibilities for compute-intensive mobile features without writing platform-specific code.

The article hints at specific use cases where Polygen outperforms traditional native modules, and the performance numbers are worth seeing.

About This Article

Problem

React Native developers couldn't access WebAssembly's performance benefits that have become standard in web development. This left a gap in mobile development when handling compute-intensive operations.

Solution

Callstack built Polygen to run WebAssembly modules directly in React Native apps. It offers a single API that works the same way on iOS and Android.

Impact

Developers can now reuse existing WebAssembly libraries for performance-critical work like image processing and cryptography on mobile. They don't need to write separate code for each platform.