Stagewise: YC-Backed Browser-Native Coding Agent Hits 6,657 GitHub Stars — Click Any UI Element, Prompt a Change

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Stagewise (YC S25) is an open-source browser-native coding agent that runs as a toolbar inside your localhost app. Developers click any UI element, describe a change in natural language, and the agent implements it directly in source code with full access to the browser's console and debugger. It bridges to IDE agents (Cursor, Copilot, Windsurf, Cline) and supports all major frontend frameworks. At 6,657 GitHub stars and trending, it represents a new architectural pattern for devtools: the browser itself becomes the coding interface, potentially displacing traditional inspect-edit-refresh workflows.