stagewise-io/stagewise: YC W25 Pivots from Browser Toolbar to Full 'Developer Browser' — Coding Agent With Native Console and Debugger Access Across All Tabs

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Stagewise launched a full Chromium-based developer browser on March 12 where the coding agent has native console and debugger access on every open tab, enabling it to reverse-engineer any website's component hierarchy, style systems, and color palettes without manual extraction. The YC Summer 2025 company began as a toolbar (130K downloads, 4.8K stars), now ships as a standalone Electron-based browser supporting React, Vue, Angular, Svelte, Next.js, and Nuxt.js out of the box. The pivot addresses the core limitation of terminal-based agents: they cannot see or interact with the visual state of the application they are building.