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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.

Developer Experience
1/29/2026

Announcing AI SDK Profiler for React Native

We introduced the AI SDK Profiler plugin for Rozenite DevTools. It captures OpenTelemetry spans emitted by the Vercel AI SDK, surfaces prompts, outputs, metadata, and latency, and works with any provider, on-device or cloud.

Mike Grabowski

CTO & Founder

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Callstack

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React Native
1/28/2026

Bringing CSS Clipping to React Native

CSS Clip-path makes it easy to create non-rectangular UI elements on the web, but React Native does not support it out of the box. This article walks through what adding Clip-Path support would involve, following the flow from JavaScript styles through React Native’s C++ core and New Architecture to native rendering on iOS and Android. It looks at how a new style property would be parsed, represented in Fabric, and applied at the platform level, using Core Animation masks on iOS and canvas clipping on Android, to show why supporting a single CSS feature requires coordinated changes across the entire rendering pipeline.

Kamil Paradowski

Software Engineer

@

Callstack

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Brownfield
1/20/2026

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

Brownie is a new shared state library designed for React Native brownfield applications. It addresses a common pain point in mixed native and React Native codebases: keeping state consistent without building and maintaining custom Turbo Modules. With Brownie, teams define their state once in TypeScript and generate matching native types automatically. The article introduces the core ideas, shows how the workflow fits into real brownfield apps, and outlines what’s included in the iOS alpha release.

Oskar Kwaśniewski

Software Developer

@

Callstack

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AI
1/16/2026

Announcing: React Native Best Practices for AI Agents

We’re publishing react-native-best-practices: a structured set of skills derived from The Ultimate Guide to React Native Optimization, designed for AI coding agents working on React Native and Expo apps. The repo covers practical techniques across JavaScript, native iOS/Android, and bundling. All contribute to the metrics that matter: FPS and TTI.

Michał Pierzchala

Principal Engineer

@

Callstack

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React Native
1/13/2026

Live Activities and Widgets with React: Say Hello to Voltra

Voltra is a new open-source library that lets you build iOS Live Activities and widgets using JSX in React Native. It removes much of the native Swift overhead while staying close to SwiftUI’s mental model.

Szymon Chmal

Software Developer

@

Callstack

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React Native
12/22/2025

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.

Michał Pierzchala

Principal Engineer

@

Callstack

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Cross-Platform
12/19/2025

Visualizing the Dual-Thread Model of Lynx JS

If you’ve felt JS thread pressure in React Native, Lynx’s runtime will feel familiar and different at the same time. This article uses a simple jammer technique inspired by React Native experiments to reset expectations and provide a clear mental baseline. From there, it shows how Lynx’s dual-thread model keeps UI-critical work responsive, even when background JavaScript is completely blocked.

Łukasz Chludziński

Software Engineer

@

Callstack

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Hermes
12/18/2025

Why You Don’t Have to Minify JavaScript Code in React Native Apps

JavaScript minification is standard practice on the web, but React Native follows a different optimization path. This article explains how the Hermes engine compiles JavaScript into bytecode and applies dead code elimination during that step, making traditional minification largely unnecessary. It also shows how to verify what actually ships in production by decompiling Hermes bundles.

Davyd Narbutovich

Software Engineer

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Callstack

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AI
12/16/2025

Profiling MLC-LLM’s OpenCL Backend on Android: Performance Insights

MLC-LLM can run LLMs fast on-device, but we hit a nasty Android issue: the first inference froze the system UI for up to 50 seconds, then everything was fine. This post walks through how we added Perfetto-compatible traces in MLC-LLM and kernel profiling in TVM/OpenCL, and why switching from _1 to _0 model formats fixed it on Adreno.

Artur Morys-Magiera

Software Engineer

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Callstack

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React Native
12/12/2025

How to Cleanly Swap Between React Native Storybook 10 and Your App

This guide shows how to easily switch between React Native Storybook 10 and your main application using Expo or the Community CLI. It helps you go through the process without accidentally shipping Storybook in your production bundle. It highlights what has changed since the original 2023 guide, including Expo environment variables, improved Metro features, and Storybook’s new withStorybook helper.

Daniel Williams

Senior Software Engineer

@

Callstack

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Virtual Reality
12/8/2025

Mobile vs. VR: Key Differences in Features, UI, and UX

This article highlights the core shifts developers face when moving from mobile screens to VR windows. It explains how windowing, typography, spacing, accessibility, and interaction patterns behave differently in a headset, and shows how to apply those changes in React Native. By understanding these differences, you can design 2D UIs that feel natural, readable, and comfortable on Meta Quest.

Jan Jaworski

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
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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Article
1/13/2026

Live Activities and Widgets with React: Say Hello to Voltra

Voltra lets you build iOS Live Activities and widgets for React Native using JSX instead of Swift.
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Article
12/22/2025

React Native Wrapped 2025: A Month-by-Month Recap of The Year

Seven major React Native releases in 2025, React Native turns 10, the New Architecture becomes the default, and 1.0 moves into view. A recap of 2025’s biggest RN updates.
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Live Stream
Live Stream
1/29/2026

Exploring Skills in Claude: A Live Walkthrough

Live experiments with Claude Skills in a React Native codebase, covering AI agents, Expo upgrades, and practical limits of automation
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Meetup
Meetup
1/29/2026

React Universe Meetup x Zalando, Berlin

React Universe Meetup lands in Berlin on January 29, 2026. Join Zalando and Callstack for an onsite React Native-focused evening.
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Live Stream
Live Stream
1/15/2026

React And React Native: The Year Kick-Off

Start the year with a React and React Native ecosystem catch-up, live coding, and practical insights from Callstack engineers.
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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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Podcast
12/10/2025

Beyond Static vs. Dynamic: Next.js's New Unified Model

Aurora Scharff (Crayon Consulting) explains how Next.js is moving to a unified model that ends the static/dynamic split and helps developers manage Suspense boundaries.