React Scan

React Scan is a performance monitoring tool specifically designed for React applications. It automatically detects slowdowns and rendering issues in your React components without requiring any code modifications to your existing application. The tool works by scanning your app in real-time, identifying components that are causing performance bottlenecks, and presenting this information through clear visual indicators.

The tool distinguishes itself by being framework-agnostic within the React ecosystem—it works with Next.js (both App and Pages routers), Vite, Remix, and can be installed via npm or added as a script tag. Unlike traditional performance tools that often require significant instrumentation or code changes, React Scan provides immediate visibility into performance issues with minimal setup. It tracks frame rate drops and highlights problematic components directly in an interactive interface.

React developers and engineering teams benefit most from this tool, particularly those working on complex applications where performance optimization is critical. It's useful during development to catch performance regressions early, and for production applications where identifying specific slow components can be challenging. The tool is trusted by engineering teams at companies like Perplexity, Shopify, and Faire, indicating its practical value for real-world React applications.