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The Open Source Agentic IDE

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.
Active Founders
Glenn Töws
Glenn Töws
Founder
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 Goetze
Founder
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.
Company Launches
stagewise: The frontend coding agent for production codebases
See original launch post

TL;DR

stagewise is a frontend coding agent for production codebases

→ ❌ No more tedious context switching
→ 🤝 Works with all kinds of web app frameworks
→ 🚀 Integrates into existing, production-grade apps

Get started now on stagewise.io and use the code STAGELAUNCH to get 25% off for 3 months! 🎉

WATCH THE DEMO

https://youtu.be/q7JFZBEfyjo



ABOUT US

We’re Julian and Glenn, and we’ve built stagewise because we wanted to quickly iterate on app frontends with AI - even if they’re not just simple prototypes anymore, but real projects.

THE PROBLEM

AI-powered app builders work great - until they don’t.

Once you move into a production-grade project setup on your local machine, you lose the awesome experience of visually building your apps frontend with simple prompts.

You move from tools like v0 or Lovable to tools like Cursor and Claude Code, but there’s a catch.

AI code editors are not good at building frontends, because:
→ They don’t understand your apps user experience
→ They don’t see your browser content, but only the codebase
→ You have to switch between browser and IDE all the time

THE SOLUTION

With stagewise, we’ve developed an open-source and framework-independent toolbar that brings our frontend coding agent right into your web app on localhost.

Here’s how it works:
→ You prompt changes by clicking and commenting on elements in your app
→ We automatically collect browser and app metadata
→ The agent makes precise changes to your local codebase

The toolbar has already surpassed 4,800 GitHub-stars ⭐️ and 130,000 downloads 📈

OUR VISION

We believe that the best user experiences are built by iterating fast and putting yourselves in the shoes of your user.

Our product enables teams to do exactly that - and we continue to work on a future, where awesome production-grade user experiences can be built lightning-fast and without coding skills.

JOIN OUR COMMUNITY

👾 Join us on Discord
𝕩 Follow us on X
📬 Contact Julian or Glenn via mail

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YC Photos
YC Summer 2025 Application Video
YC Summer 2025 Demo Day Video
stagewise
Founded:2024
Batch:Summer 2025
Team Size:2
Status:
Active
Location:San Francisco
Primary Partner:Jared Friedman