Mike Grabowski

Apex is our new coding model designed for React Native. It achieves frontier coding results for mobile workflows at a fraction of the cost.

A short recap of Codex events in Berlin, Wroclaw, Warsaw, Sopot, and Miami, plus what we learned from each format and where we want to go next.

Lessons from React Universe Meetup x Zalando on React Native in production, covering brownfield performance, feed video, native API access, and on-device AI.

Agent React DevTools gives AI agents access to the React component tree, state, and performance data, enabling deeper debugging and more reliable QA for React and React Native apps.

How Codex plugins work, why they're useful for React Native development, and two plugins we built for building and testing React Native apps.

We built an open-source benchmark to measure how AI coding models handle real React Native tasks, such as animations, async state, navigation, and more.

Most AI apps stop at chat. This article explores generative UI: letting the model describe the interface at runtime and rendering it dynamically in React using JSON Render. Includes architecture, code examples, and a real project case study.

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.

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.

Learn how to move beyond file-based audio APIs and work directly with in-memory PCM data in React Native. This guide shows how to construct WAV buffers, use JSI for zero-copy transfers, and enable real-time audio processing.

Learn how to bring Apple’s new Liquid Glass design material into your React Native apps. This guide covers design best practices, performance tips, and examples using LiquidGlassView and LiquidGlassContainerView.

TurboModules provide a type-safe way to write native code in React Native. JSI sits underneath as a lower-level API, enabling direct interaction with the JavaScript runtime. Beyond what TurboModules expose, JSI gives you access to powerful features, such as working directly with ArrayBuffers. This article shows how to inject a custom binding step by step.

On-device speech synthesis is now available in the AI SDK for React Native. Powered by Apple’s AVSpeechSynthesizer, it delivers private, low-latency text-to-speech with rich voice options and offline support.

Add speech-to-text features to your React Native app using Apple’s SpeechAnalyzer and SpeechTranscriber APIs in iOS 26. Runs entirely on-device, with system-managed language models and support for multiple languages.

Use on-device text embeddings in React Native. Our Vercel AI SDK provider leverages Apple's built-in NLP framework, adding powerful AI features to your app with zero extra downloads or increased bundle size.

The Apple provider for Vercel AI SDK now supports tool calling, enabling on-device LLMs to execute custom functions in React Native apps. Build faster, more interactive mobile AI experiences.

React Native now supports Apple’s on-device LLM for private, fast, and offline AI experiences. Build with Foundation Models and bring Apple Intelligence features to your mobile app.

Discover Flows AI, a lightweight library for building AI workflows with Vercel AI SDK. Simplify agent orchestration and explore flexible, scalable solutions.

Reduce time-to-market, development cost, and move faster with features by implementing React Native with a brownfield approach.

When you automate your dependency management, you can fully focus on developing your app. Find out how you can do it with autolinking.

Shipping Over-The-Air may save your app from a lot of trouble. Find out why and how you can make your application OTA-ready.

Continuous Deployment (CD) lets you ship new features or check for critical bugs fast. Find out more about developing apps with a CD setup.

Use libraries dedicated to mobile and build features faster on many platforms at once, without compromising on the performance and user experience.

Find the balance between native and JavaScript to build fast-working and easy-to-maintain apps.

Read the article and find out how Continuous Integration (CI) can improve the building, testing, and distribution of your React Native apps.

How to use dedicated, higher-ordered React Native components to improve user experience and performance of your apps.

Learn how to achieve better performance and optimize Android app startup time with Hermes.

Interested in the Hermes engine? Check the second part of our expert guide to find out how to integrate Hermes with React Native.

Want to use Hermes in your React Native app on iOS? Find out how to compile Hermes for Apple platforms. Check the first part of our expert technical guide.

Hermes is now available for iOS as well. Find out more about this JS engine - check the first part of our series on bringing Hermes to iOS.

Learn how to test your app in the cloud by reading the second part of our quick guide. You'll find out how to create such test and conduct it properly.

A quick guide on how to test React Native apps in the cloud instead of using testing devices. In this part, you'll find out how to prepare for this process.

Learn about the release of React Native 0.63.1 from Mike Grabowski - a Core Contributor and Callstack Co-Founder and CTO.

Recommendations related to the challenges and opportunities of building React and React Native apps.

React Native can help your business in the pandemic. Check our how-to guide for immediate cost reduction on app development.

React Native CLI 3.1.0 and 4.0.0 are out now! Find out how it makes developers experience better and what has changed comparing to the previous version.

Find out all about React Native Testing Library becoming Testing Library. Dive into insights and updates as we navigate this transformative journey.

Learn more about Rebolt - Callstack's take on developing React Native apps in Reason.

Learn more about ReRoute - new open source library created to help developers in navigation, written in Reason.

Callstack is focused on cross-platform development with React Native as a primary technology. Check examples of tools we created for our clients in Open Source.

Case studies of our clients' success in React Native mobile app development - each having its own set of problems and expectations

One of the most popular examples on using Flowtype with Redux is the F8 app, open-sourced by Meta. Check the article for more details.

We are happy to announce the React Native EU 2017 conference. Keep an eye on the conference website for more details.

A step-by-step guide to testing your React Native apps for iOS ecosystem.

A step-by-step guide on how to install Facebook SDK in a React Native app. Check it out!

One of the best things in React Native is the ability to write the native interface with Javascript that feels way better than any hybrid solution out there. With your UI represented as a set of…

Discover how the NFL uses React Native, Expo, and a monorepo to ship apps across iOS, Android, web, and TV with one stack.

This episode provides insights into the most intriguing aspects of React Native. Check the podcast to find out what our special guests have to say!

Listen to Mike Grabowski talk about React Native FastIO, a collection of primitives for working with data in React Native and its performance benefits.

Explore how React Native Windows compares to Electron, its benefits for desktop apps, and practical tips for getting started or migrating from native apps.

The 10th episode of The React Native Show podcast includes the answers for questions asked during React Native Eu 2021 conference in the Q&A panel form.

Discover how Hermes boosts React Native performance on iOS and macOS, with insights into AOT, bytecode precompilation, and the future of Hermes support.

This episode explores Re.Pack, an Open Source, Webpack-based toolkit to build React Native apps with the full support of the Webpack ecosystem.

The first episode of React Universe On Air (formerly known as The React Native Show) provides insights into React Native Testing Library. Mike and his guest give a quick glimpse into the very concept of Testing Library and tell the story behind React Native Testing Library.

Learn how Shopify's migration to React Native led to 86% code unification, reduced build times, and seamless feature parity across platforms.

Discover the story behind Definitely Typed with its creator, Boris Yankov, and learn how it became essential for type-safe JavaScript in the TypeScript ecosystem.

Tune in to React Universe On Air to learn what's new in React Navigation 5, how it improves app routing in React Native, and what to expect from the upcoming v6.0 release.

Learn everything about React Native Paper—from its core features to native-like animations, performance with Turbo Modules, and future development plans.

Learn how to tackle brownfield development with React Native, explore real-world challenges, and discover the React Native Brownfield library.

Discover how Zalando scaled React Native across a massive e-commerce app, from internal buy-in to brownfield rollout, and what they learned.

Most teams use React on the web but still rely on native code or WebViews in their mobile apps. This talk explores how React Native can replace WebViews with minimal effort, allowing React to power both web and mobile.

Explore React Native’s past, present, and future with insights from Meta and Callstack on stability, new architecture, and enterprise-ready tooling.

React Native Conf 2025 brought huge announcements: React Foundation under Linux Foundation, React Compiler 1.0 and Hermes v1. What’s next for React Native and newest React Features.

Nuqs 2.5, Remix v3, Expo Launch, SPM support in React Native, the Jest RFC, and native Text-to-Speech with guest insights from Mike Grabowski.

Learn how to migrate your React Native Community CLI app to Expo incrementally, with minimal risk. A recording of a webinar hosted by Callstack & Expo.

From inside shadows to decentralized music players, catch the latest React Native takes in Week 28 live dev session with Łukasz, Kewin, and Mike.

Live dev stream exploring Skia, Nitro Modules, AI app builders, and React Native tools; plus side quests into canvas UIs, Lottie, and pizza-coded joy.

Tune in to a live session unpacking React Native 0.80, OTA alternatives, AI-generated UIs, styling wars, and some truly wild tech tangents.

Watch how MLC brings on-device AI to React Native. See react-native-ai in action and discover what’s next for local model execution.

Explore runtime hooks, prefetching MF remotes, and more in Re.Pack 5.1. Join us live or watch the replay.

Discover how Module Federation and Re.Pack enable true cross-platform super apps with React Native. Learn best practices and real-world strategies for dynamic, modular architectures.

Discover how to build universal Super Apps using React and React Native. Join Mike Grabowski, CTO at Callstack, as he explores dynamic code delivery, native UI rendering, and how RePack bridges the gap with Module Federation.

Learn to fix JS performance issues in React Native-from debounce bugs to Redux selectors, in this hands-on webinar with real code examples.

Discover how to skip 90% of native builds in React Native CI using Rock. Includes a live demo and cost-saving insights from Expensify’s setup.

Missed the React Universe Meetup SF? Watch the livestream recording soon, talks on RN performance, optimization, and build-free workflows await.

Watch Callstack's webinar on React Native JS performance. Learn to fix bottlenecks, leaks & FPS issues from the 2025 Ultimate Guide authors.

Learn more about Callstack's Rock straight from its creators.

Learn how to use React Native in existing apps to speed up cross-platform development without a full rewrite. Watch the expert-led webinar now.

Join us for a deep dive into Polygen: Callstack Incubator's breakthrough in React Native development!

We’re checking out LynxJS for the first time! Join us as we test it out, see how it works, and share their thoughts.

Mike and Oskar tried both Repl.it and Bolt.new to code a new conference app, and after burning millions of tokens, they fell back to Cursor.

Learn how on-device models in React Native can call tools, interact with external APIs, and return structured outputs you can use directly in application logic.