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Articles

Articles for developers, by developers

Technical insights from building React and React Native production-grade apps, contributing to core libraries, and solving complex cross-platform challenges.

iOS
11/25/2025

Integrating Swift Package Manager With React Native Libraries

React Native has relied on CocoaPods for iOS dependency management, but Swift Package Manager has become the preferred option for modern Swift development due to its performance and tight Xcode integration. Since React Native 0.75, the spm_dependency helper lets libraries declare SPM packages directly in their podspec files, enabling support for third-party Swift packages distributed only through SPM. This article explains how the integration works, how to adopt it for both remote and local packages, and what to expect until official support ships.

Mike Grabowski

CTO & Founder

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Callstack

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Performance
11/21/2025

Memory Ownership Models: When JavaScript Meets Native Code

React Native makes it easy to pass data between JavaScript and native code, but things get complicated once you leave the synchronous path. This article explains what really happens when ArrayBuffer memory crosses the JS and native boundary, why raw pointers can become invalid during async work, how garbage collection affects native code, and what safe patterns you can use today.

Kamil Paradowski

Software Engineer

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Callstack

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Virtual Reality
11/20/2025

How to Release a React Native App on the Meta Horizon Store

This article walks through the full release flow for React Native apps on Meta Quest, from preparing a production build to submitting it through the Horizon Store. Developers will learn the technical steps, required tools, and best practices for store‑ready assets. It also highlights common review pitfalls, guidance for creating high‑quality screenshots, monetization options, and tips for shaping a smooth submission workflow. By the end, readers will understand how to take a Quest app from development to a polished, store‑ready release.

Jan Jaworski

Software Engineer

@

Callstack

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Cross-Platform
11/7/2025

Exploring Lynx JS: From Quick Start to CLI Workflows

Lynx JS is ByteDance’s new cross-platform runtime that brings JavaScript closer to native performance. In this guide, we walk through the Lynx ecosystem, how to get started quickly, and how the community-built CLI enables greenfield native projects. Ideal for React Native developers curious about the next wave of cross-platform tooling.

Łukasz Chludziński

Software Engineer

@

Callstack

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Virtual Reality
11/6/2025

What You Can Build With React Native on Meta Quest

This article offers inspiration for Meta's $1.5M Developer Competition by outlining what you can build with React Native on Quest. It details app possibilities like meditation, interactive games, and MR experiences, encouraging developers to use VR-specific features.

Jan Jaworski

Software Engineer

@

Callstack

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Virtual Reality
10/30/2025

Using Expo Libraries on Horizon OS: A Guide to Compatibility

This article serves as a compatibility guide for developers using Expo with React Native on Meta's Horizon OS. It explains why Horizon OS, a custom Android build lacking Google Play Services, creates compatibility differences. The post details which core Expo libraries work, which require configuration via the expo-horizon-core plugin, and which need specific forks (like expo-horizon-notifications) or updated libraries (like expo-iap) to function, enabling developers to build for VR with familiar tools.

Jan Jaworski

Software Engineer

@

Callstack

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Virtual Reality
10/22/2025

Getting Started With Expo on Meta Quest

This article guides developers on using React Native and Expo to build applications for Meta Horizon OS. It starts with a simple setup using Expo Go, allowing developers to run and live-reload apps on a Meta Quest device in minutes. The guide also details important platform differences, such as permissions and responsive design, and explains how to transition to a full development build to unlock the entire React Native ecosystem.

Jan Jaworski

Software Engineer

@

Callstack

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Testing
10/15/2025

Introducing React Native Harness: Fast, Real-Device Testing for Native Modules

Introducing React Native Harness: a new way to test native modules directly on real devices and emulators. It brings together the speed and simplicity of Jest with the realism of on-device execution, giving developers a powerful, CI-ready tool to validate native behavior with ease. Harness makes it simple to ensure your native code works exactly as intended across every platform.

Szymon Chmal

Software Developer

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Callstack

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Performance
10/14/2025

From Files to Buffers: Building Real-Time Audio Pipelines in React Native

Most audio APIs are designed around files. You generate sound, save it, then read it back for playback or processing. While simple, this workflow breaks down when you need low latency or real-time interaction. In this article, we’ll explore how to work with raw PCM data entirely in memory, construct valid WAV buffers on the fly, and transfer them efficiently to JavaScript using JSI. The result is a flexible foundation for building real-time audio features directly in React Native.

Mike Grabowski

CTO & Founder

@

Callstack

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Virtual Reality
10/8/2025

Learn Once, Write for VR: A React Native Showcase for Meta's HorizonOS

This article details the successful creation of a React Native app for Meta's HorizonOS. It proves the framework is a viable solution for building performant VR experiences by reusing code and leveraging familiar libraries. The resulting showcase app includes camera integration, audio playback, and smooth navigation.

Jan Jaworski

Software Engineer

@

Callstack

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TV
10/3/2025

Cross-Platform TV Apps With React Native for tvOS, Android TV, and Tizen

While widely known for mobile, React Native's flexible architecture makes it a proven and practical solution for building TV applications. This article explores how "out-of-tree" platforms allow developers to escape the fragmented world of traditional TV SDKs (tvOS, Android TV, webOS) and unify their workflow. Whether your team is new to React Native or already has a mobile codebase, you'll discover the benefits of code sharing, improved developer experience, and how major companies are using it to efficiently deliver production-ready apps to the living room screen.

Łukasz Chludziński

Software Engineer

@

Callstack

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Insights

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Stay up to date with our latest insights on React, React Native, and cross-platform development from the people who build the technology and scale with it daily.

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Article
11/25/2025

Integrating Swift Package Manager With React Native Libraries

Learn how to use Swift Package Manager with React Native libraries, including support for both remote and local SPM packages. This guide explains the spm_dependency helper, monorepo workflows, and current limitations.
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Article
11/21/2025

Memory Ownership Models: When JavaScript Meets Native Code

A deep dive into how React Native handles memory when JavaScript and native code share ArrayBuffer data. Learn why async processing can break, how GC affects raw pointers, and the safe patterns for building high-performance native integrations.
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Article
11/20/2025

How to Release a React Native App on the Meta Horizon Store

Learn how to build, submit, and publish your React Native app on the Meta Horizon Store.
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Article
11/7/2025

Exploring Lynx JS: From Quick Start to CLI Workflows

Learn how to set up Lynx JS, explore its ecosystem, and use the Community CLI to build native apps with a familiar JavaScript workflow.
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Article
11/6/2025

What You Can Build With React Native on Meta Quest

Get React Native app ideas for Meta Quest, inspired by Meta's $1.5M developer competition. Explore VR/MR concepts for meditation, games, and social apps.
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Article
10/30/2025

Using Expo Libraries on Horizon OS: A Guide to Compatibility

Learn how to use Expo libraries for React Native development on Meta's Horizon OS. This guide covers compatibility differences, what works out-of-the-box, and what requires specific alternatives like expo-horizon-core and expo-iap.
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Live Stream
Live Stream
11/20/2025

Introducing Solito 5 and the Web-Native Mindset

Join us on November 20 for a deep dive into Solito 5 with its creator, Fernando Rojo, and the Callstack team.
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Live Stream
Live Stream
11/13/2025

Inside Valdi: What We Learned Exploring Snapchat’s New UI Framework

A hands-on look at Valdi, Snapchat’s new UI framework: setup, architecture, rendering model, and early developer impressions.
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Live Stream
Live Stream
11/6/2025

Hermes V1: What It Is, What It Isn’t, and What’s Next

Łukasz Chludziński, Szymon Chmal, and Matt Hargett unpack Hermes V1, covering what’s new, what’s changing, and what’s ahead for React Native performance.
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Podcast
11/25/2025

Amazon's Vega OS: A New OS With React Native Built-In

Giovanni Laquidara (Amazon) introduces Vega OS, a new lightweight operating system with React Native built-in, designed for high-performance on low-end media devices.
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Podcast
11/24/2025

It's Not New: How 'The Architecture' Unlocks React Native's Future

Riccardo Cipolleschi (Meta) explains why the New Architecture is now just The Architecture and how it serves as the foundation for concurrent rendering, DOM APIs, and Hermes V1.
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Podcast
11/21/2025

React Foundation: New Governance Model for React and React Native

Seth Webster, Executive Director of the React Foundation, details its new governance model, Meta's role, and how partners like Callstack and Microsoft will ensure stability and scale.