by stagewise (YC S25)
Stagewise
Open-source frontend coding agent that lives in your browser — click on any element, describe the change, and it edits your local codebase directly.
Stagewise is a browser-native frontend coding agent built for production codebases. Instead of switching between your browser and IDE, Stagewise runs as a toolbar inside your running app on localhost. Click any UI element, prompt a change like "make this green and move it to the top right", and the agent implements it directly in your source code. Supports all major frontend frameworks including React, Vue, Next.js, Angular, and Svelte. Open source (AGPL-3.0) with BYOK support for all major AI providers. Backed by Y Combinator S25 with 6,500+ GitHub stars. Also available as a full developer browser — a standalone environment where your app, the open web, and your agent share one window.
Capabilities
Pros & Limitations
Editorial assessmentPros
- ✓Visual click-to-edit on live localhost app
- ✓Works with any frontend framework
- ✓Open source with BYOK — no vendor lock-in
- ✓6,500+ GitHub stars and active community
- ✓YC S25 backed
Limitations
- ⚠Primarily frontend-focused — not a general-purpose coding agent
- ⚠Full developer browser is Electron-based, adds overhead
- ⚠AGPL-3.0 license has commercial use restrictions
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