Articles by Kacper Kapuściak

I've authored and co-authored dozens of technical articles on the Expo, Software Mansion, and Callstack blogs, writing about React Native, developer tooling, debugging, and agentic testing. I've also co-authored 10 issues of This Week in React, covering the latest in the React and React Native ecosystems.

  1. 2026

  2. Agentic Mobile Testing With e2e and agent-device

    How e2e uses agent-device for AI-driven iOS and Android tests, combines exact assertions with agent actions, and replays cached steps without model calls.

    Callstack

  3. 5 Signs It's Time to Rewrite Your App

    No-code platforms get you to product-market fit fast, but performance under load, exported code you cannot maintain, and vendor lock-in eventually catch up with you.

    Software Mansion

  4. Control Your iOS Simulator with an AI Agent on a Local LLM

    Run a local LLM as an AI agent that controls the iOS Simulator: a free, private, offline setup with Ollama, Gemma 4, and Argent.

    Software Mansion

  5. This Week In React #284

    App.js Conf 2026 in Kraków: Gesture Handler 3.0, Swift Package Manager support for React Native, Legend List 3.0, and Expo's EAS Observe.

    This Week In React

  6. Argent: Agentic Toolkit to Control, Debug & Profile Apps

    Argent gives AI coding agents direct access to the iOS Simulator so they can run, inspect, debug, and profile applications autonomously.

    Software Mansion

  7. This Week In React #279

    The Rust React Compiler is being tested at Meta, an 18-month retrospective, Swift Package Manager support proposed for React Native, and React Navigation v8's retain API.

    This Week In React

  8. This Week In React #270

    The React Foundation officially launches, Cloudflare rebuilds Next.js with AI, Hermes comes to Node.js, and CSS Grid is coming to React Native.

    This Week In React

  9. This Week In React #264

    Back from the holidays: Next.js 16.1, React Router security fixes, Waku 1.0 alpha, Voltra for Live Activities, and React Native 0.84 with Hermes V1.

    This Week In React

  10. 2025

  11. This Week In React #260

    TanStack Pacer in beta, a 20,000x faster TanStack Router matcher, React 19 Actions, and Vercel's deep dive into building the v0 iOS app.

    This Week In React

  12. This Week In React #254

    React Conf 2025's React Native day: VirtualView, a sneak peek at React Native 0.83, Next.js 16 beta, and the introduction of Remix 3.

    This Week In React

  13. This Week In React #246

    Summer's over and the releases are flooding in: Next.js 15.5, React Native 0.81, and FlashList 2 with its long-awaited performance boost.

    This Week In React

  14. This Week In React #242

    How Meta renders React server-side, Vercel acquiring NuxtLabs, React Native Unistyles 3.0 stable, and the first RC of React Native 0.81.

    This Week In React

  15. Best React Native Debugging Tools in 2025

    A tour of the best React Native debugging tools in 2025, including React Native DevTools, Radon IDE, Reactotron, and native platform tools.

    Software Mansion

  16. This Week In React #234

    A quieter week with great articles: Vite's RSC support, a new React Query proposal, and what's coming in React Native 0.80.

    This Week In React

  17. This Week In React #229

    A new chapter for the newsletter: Tomasz and Kacper from Software Mansion join as authors, covering React Conf 2025 and React Native 0.79.

    This Week In React

  18. 4 must-have Radon IDE features for convenient Expo development

    Radon IDE transforms your editor into a powerful IDE for React Native, providing a single, unified experience to build Expo apps faster.

    Expo blog