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The Open Source Agentic IDE

Summer 2025Founded 20242 peopleSan Francisco, CA, USA

About

stagewise is building the open-source agentic IDE: a developer workspace for creating and orchestrating coding agents, previewing running apps, and managing Git workflows. Developers can run agents in parallel, use their preferred models or existing coding subscriptions, and keep agents connected to browser/runtime context as well as the broader codebase, from APIs and tests to docs and deployment paths.

Founders · 2

Glenn Töws
Glenn TöwsFounder

Co-founder and CEO of stagewise, the frontend coding agent for real codebases. Studied electrical engineering at DHBW Mosbach and in partnership with Rheinmetall, focussing on functional safety in automotive embedded software. Led the efforts for development and adoption of a state-of-the-art componentization framework for embedded software at Miele, before making a pivot to artificial intelligence and web technologies.

Julian Goetze
Julian GoetzeFounder

Founder/ CTO of stagewise.io, a frontend coding agent that lives inside your browser on localhost. As a core engineer, I helped scale saasmetrix. I also built a PLG product strukto.io that helped fellow CS students from 0 to 5,000 MAU. I love building great products.

Launch

Launched on Y Combinator · Jul 2025
View launch post ↗

Visually build your apps frontend right inside your browser on localhost.

Stagewise launches an open-source frontend coding agent that integrates into a local web app to iteratively modify production-grade frontends via in-app prompts and element annotations. It targets teams building production apps and aims to reduce context switching by handling frontend changes directly in the browser.

B2BEngineering, Product and DesignArtificial IntelligenceDeveloper ToolsOpen SourceWeb Development

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