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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
3/18/2026

A Practical Guide to LLM Model Naming Conventions

The same LLM can appear in many variants because different hardware environments require different numerical precision. This article breaks down quantization, explains model naming conventions, and shows how deployment constraints shape model formats. Explore how quantization impacts performance and infrastructure costs.

Lech Kalinowski

Senior AI Systems Engineer

@

Callstack

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Brownfield
3/13/2026

Handling Navigation in React Native Brownfield Apps

Navigation between React Native and existing native screens can be difficult in brownfield apps. This guide shows how to define a navigation contract, generate native delegates, and connect both layers using @callstack/brownfield-navigation.

Hur Ali

Software Engineer

@

Callstack

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AI
3/5/2026

Announcing React Native Evals

React Native Evals is a new open-source benchmark from Callstack that evaluates how coding models implement real React Native tasks. The suite ships with 39 evals across animation, async state, and navigation categories, covering libraries like Reanimated, TanStack Query, Zustand, and React Navigation.

Mike Grabowski

CTO & Founder

@

Callstack

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React Native
3/5/2026

Keeping Screens Visible With <Activity mode="hidden">

`<Activity mode="hidden">` can reduce unnecessary work by unmounting effects for inactive UI trees. But it also hides the UI with `display: none`, which causes issues for gesture‑driven navigation. This article explores a workaround that keeps screens visible while still freezing effects across native and web.

Satyajit Sahoo

Software Engineer

@

Callstack

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AI
3/3/2026

Building Apps Where AI Generates the UI

Most AI apps wrap powerful models in a simple chat interface. This piece explores a different direction: letting the model generate the interface itself. Instead of returning text, it describes what the user should see next. The UI is decided at runtime, adapting to each user and context rather than being hardcoded in advance. The article walks through the architecture behind this pattern and shows it in practice with a project that turns static PDF forms into adaptive, AI-driven interviews.

Mike Grabowski

CTO & Founder

@

Callstack

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Cross-Platform
2/27/2026

Sparkling: The Missing App Layer for Lynx.js?

Lynx.js shipped with a strong brownfield story, but greenfield path felt incomplete. Sparkling changes that by bundling a CLI, native navigation, typed bridge APIs, and platform tooling into one cohesive layer. This article walks through bootstrapping a project, understanding the generated structure, and testing how navigation works in practice.

Łukasz Chludziński

Software Engineer

@

Callstack

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Brownfield
2/26/2026

Announcing: React Native Brownfield v3 with Expo Config Plugin

Moving a large native app to React Native rarely happens in one rewrite. React Native Brownfield v3 combines Expo with an artifact-based packaging approach, so you can ship React Native screens inside your existing app without destabilizing your product.

Artur Morys-Magiera

Software Engineer

@

Callstack

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React Native
2/25/2026

React Native Monorepo With pnpm Workspaces

This guide shows how to configure pnpm workspaces for a React Native monorepo that spans mobile and web. It covers pnpm-workspace.yaml, pnpm.overrides, Metro configuration for hoisted deps, and a shared UI package used by both apps.

Nazar Sydiaha

Software Engineer

@

Callstack

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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

@

Callstack

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AI
2/17/2026

Agent Device: iOS & Android Automation for AI Agents

This article introduces agent-device, a new CLI for automating mobile UI workflows with AI agents. It explains what the tool is, how it helps developers with token-efficient snapshots and repeatable interactions, and why Callstack is building it to bridge exploratory agent behavior with deterministic replay across iOS and Android.

Michał Pierzchala

Principal Engineer

@

Callstack

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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

@

Callstack

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Article
3/18/2026

A Practical Guide to LLM Model Naming Conventions

Learn how to read LLM naming conventions and choose the right model for your hardware. Discover what Q4, INT8, GPTQ, and GGUF mean and why models appear in multiple variants.
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Article
3/13/2026

Handling Navigation in React Native Brownfield Apps

Learn how to connect React Native and native navigation using a typed bridge with @callstack/brownfield-navigation.
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Article
3/5/2026

Announcing React Native Evals

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.
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Article
3/5/2026

Keeping Screens Visible With <Activity mode="hidden">

A cross‑platform workaround to keep screens visible while <Activity mode="hidden"> unmounts effects on inactive screens by setting mode="hidden".
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Article
3/3/2026

Building Apps Where AI Generates the UI

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.
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Article
2/27/2026

Sparkling: The Missing App Layer for Lynx.js?

A hands-on look at Sparkling for Lynx.js: CLI, native navigation, and the tooling layer that turns Lynx into a full mobile app framework.
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Live Stream
Live Stream
3/19/2026

Agent Device, AI workflows, and mobile testing in practice

A discussion on Agent Device, AI-driven workflows, and testing mobile apps using simulators and accessibility data.
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Live Stream
Live Stream
3/12/2026

React Native Evals: Measuring AI Code Quality in Practice

React Native Evals introduces a data-driven way to measure how AI coding models perform on real React Native development tasks.
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Talk
Talk
3/4/2026

The Safe Detonation Chamber: Building AI You Can Actually Ship

How to design production AI systems using Vercel AI SDK, Workflows, and Sandbox , covering vendor lock‑in, long‑running workflows, and secure code execution.
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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
March 19, 2026

The Hard Way vs. The React Native AI SDK Way: Stop Writing Custom Modules for Every Model

Learn how React Native AI uses a unified provider model to switch between cloud and on-device LLMs without rewriting application logic, enabling reliable AI experiences online and offline.
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Tutorial
March 12, 2026

Build Smarter Apps: Tool Calling & AI Orchestration Explained

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.
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Tutorial
March 5, 2026

MLC LLM + React Native: On-Device AI Without the Pain

Learn how to run third-party on-device LLMs in React Native using MLC LLM. Choose your models, run them efficiently across platforms, and keep a unified JavaScript API with React Native AI.
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Tutorial
February 24, 2026

Intelligent Fallbacks with Apple Intelligence in React Native

Learn how to use Apple’s built-in Foundation Models in React Native apps, reduce memory usage, and enable fast, fully on-device AI with React Native AI Apple.
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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.