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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.

React Native
2/18/2026

A Practical Guide to React Native Monorepo With Yarn Workspaces

This guide walks through setting up a React Native monorepo that supports both mobile and web apps using Yarn workspaces. You’ll configure Metro, Android and iOS builds, TypeScript, and shared packages so your apps can reuse UI and logic without duplication.

Nazar Sydiaha

Software Engineer

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Callstack

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Hermes
4/21/2021

Hermes Performance on iOS

React Native 0.64 brings Hermes, a new JavaScript engine, to iOS. We tested it on a real-world app to see how it compares to the default JSC engine. The results? Hermes made the app start up to 40% faster, especially on older devices.

Jakub Kłobus

Software Engineer

@

Callstack

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Hermes
4/14/2021

Bringing Hermes to iOS in React Native 0.64

React Native 0.64 brings Hermes, a JavaScript engine optimized for mobile apps, to iOS for the first time. We walk through the technical details of how the Callstack team worked with Facebook and Microsoft to compile Hermes for Apple platforms and integrate it with React Native.

Mike Grabowski

CTO & Founder

@

Callstack

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React Native
2/3/2021

Grow Your Business With React Native SDK Wrapper

Integrating your SDK with React Native can open up new opportunities for your business. This guide explores how creating a React Native wrapper for your SDK can help you reach more developers, speed up integration, and provide a better experience for your customers.

Krzysztof Wróblewski

Marketer

@

Callstack

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Community
11/27/2020

Q&A Sessions From React Native EU 2020

This article shares key insights from the Q&A sessions at React Native EU 2020. Engineers from Facebook, Microsoft, and other top companies discuss the latest updates to React Native architecture, cross-platform development, and tips for optimizing app performance.

Krzysztof Wróblewski

Marketer

@

Callstack

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Testing
10/29/2020

Testing React Native Apps in the Cloud - Part 2

Tired of waiting for tests to run on your local machine? This guide walks through how to set up cloud testing for React Native apps using XCUITest and AppCenter. You'll learn how to create test suites, submit your app, and verify the results across multiple devices.

Mike Grabowski

CTO & Founder

@

Callstack

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Testing
10/22/2020

Testing React Native Apps In the Cloud - Part 1

Testing React Native apps on real devices can be challenging, especially for rare or older models. Cloud testing services like Microsoft's AppCenter allow you to easily run tests on hundreds of iOS and Android devices in parallel, without needing physical devices. This guide walks through how to set up a React Native project and configure AppCenter to run tests in the cloud using native frameworks like XCUITest.

Mike Grabowski

CTO & Founder

@

Callstack

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Community
9/10/2020

React Native EU 2020 Virtual Edition - Summary

React Native EU 2020 brought together nearly 6000 developers from around the world for two days of live-streamed talks on React Native. The virtual conference featured 24 speakers sharing insights on topics like performance, testing, GraphQL, and the new React Native architecture.

Krzysztof Wróblewski

Marketer

@

Callstack

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Enterprise
8/27/2020

How Can React Native Paper Help Startups and Enterprises?

React Native Paper is a UI component library that helps startups and enterprises build beautiful, accessible apps faster. It provides 30+ customizable components that follow Material Design guidelines, support theming and RTL languages, and integrate with React Navigation.

Łukasz Walczak

Software Engineer

@

Callstack

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Scalability
8/13/2020

12 Rules and Approaches of Code Writing for Beginners

Writing clean, readable code is essential for developers at any level. This guide shares 12 practical rules to help you structure code logically, use consistent naming conventions, and make your projects easier to read, test, and maintain over time.

Mariia Marchenkova

Software Engineer

@

Callstack

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Testing
8/5/2020

React Native Testing Library With Redux

Testing Redux with React Native Testing Library doesn't have to be complex. This guide walks through how to set up a custom render function to test your connected components in a real Redux environment, without relying on implementation details.

Maciej Jastrzębski

Software Engineer

@

Callstack

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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
2/18/2026

A Practical Guide to React Native Monorepo With Yarn Workspaces

Learn how to set up a React Native monorepo with Yarn workspaces for mobile and web, including Metro, Gradle, and shared packages.
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Article
2/17/2026

Agent Device: iOS & Android Automation for AI Agents

Agent Device is a lightweight CLI for AI-driven mobile automation on iOS and Android, with structured snapshots and deterministic replay.
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Article
1/29/2026

Announcing AI SDK Profiler for React Native

Announcing the AI SDK Profiler plugin for Rozenite DevTools. Capture OpenTelemetry spans from the Vercel AI SDK and inspect AI requests across on-device and cloud providers.
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Article
1/28/2026

Bringing CSS Clipping to React Native

A deep look at how a single CSS feature moves through React Native’s New Architecture, from JavaScript styles to native rendering on iOS and Android.
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Article
1/20/2026

Introducing Brownie: Type-Safe Shared State for React Native Brownfield Apps

A type-safe shared state library for React Native brownfield apps. Brownie syncs native and React state from a single TypeScript schema.
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Article
1/16/2026

Announcing: React Native Best Practices for AI Agents

We're turning React Native optimization knowledge into agent-ready skills (JS, native, bundling) mapped to FPS and TTI, built from real-world production work
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Live Stream
Live Stream
2/19/2026

React Native 0.84 and Other News

Join Kewin and Daniel for a developer-focused breakdown of the latest React and React Native news.
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Live Stream
Live Stream
2/12/2026

Sparkling: A New Framework for Lynx

Join the Lynx team live as we explore Sparkling, its boundaries with Lynx, core features, and bootstrap a project from scratch.
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Live Stream
Live Stream
2/5/2026

Storybook Explained: From Basics to Advanced Workflows

Core Storybook concepts, stories and args, interaction testing, and how Storybook works in React Native projects.
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Podcast
2/17/2026

From Teddy Bears to Voice Agents: Kraen Hansen on Voice AI, Local-First & App Security

What happens when you combine voice agents and teddy bears? A hands-on look at local-first systems, voice AI, and security lessons from poking real apps.
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Podcast
1/12/2026

Building v0 iOS and Fixing React Native Along the Way

A technical look at building v0 mobile with React Native and Expo, covering iOS-first decisions, native modules, and fixes pushed to React Native core. Featuring Fernando Rojo, Szymon Rybczak, and Oskar Kwaśniewski.
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Podcast
12/17/2025

A (Secure) Christmas Carol: The Story of Npmezer Scrooge

A holiday story about npm audits, unpinned dependencies, and the real cost of ignoring JavaScript security warnings.
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Tutorial
February 10, 2026

What Is the React Native AI SDK? A Complete Intro & Quickstart

Learn why on-device AI matters for React Native apps, how local LLMs behave offline, and what problems React Native AI is designed to solve from day one.
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Tutorial
January 29, 2026

Implementing an Android TurboModule with Kotlin

Learn how to implement a React Native TurboModule on Android, from the TypeScript spec and Codegen to the Kotlin implementation and package registration.
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Tutorial
January 19, 2026

Working with Different Threads in Swift TurboModules

Learn how JavaScript, native module, background, and main threads interact in React Native TurboModules, and how to use GCD queues to run async work safely in Swift.
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Tutorial
January 9, 2026

How to Add Type-Safe Constants to Swift TurboModules

Learn how to expose typed, immutable constants from a Swift TurboModule using Codegen, and get full end-to-end type safety between native and JavaScript.
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Tutorial
December 30, 2025

Adding Event Emitters to Your TurboModule in Swift

Learn how to emit native events from a Swift TurboModule and subscribe to them in JavaScript, including proper memory management and Codegen integration.
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Tutorial
December 22, 2025

Writing Your First TurboModule in Swift

Learn how to build a fully working TurboModule in Swift, integrate it with Codegen, and bridge it through Objective‑C inside an Expo app.