StateViz is a universal Chrome extension designed for visualizing data flow within web applications. It supports various libraries such as React, Svelte, and promises more to come. The extension offers multi-library support, allowing users to examine applications built with different libraries concurrently. It provides a detailed visualization of the application structure, including components, DOM elements, and library-specific elements like Svelte blocks.

Users can inspect real-time component data, including props, state, and library-specific details such as contexts and hooks for React. StateViz also features element filters to display only desired elements, DOM element highlighting for efficient navigation, and offers both light and dark modes for user preference. While requiring permissions to access the app tree, the extension does not transmit data remotely and is fully open source on GitHub.