Stagewise (YC S25) – Front end coding agent for existing codebases
Hey HN, we're Julian and Glenn, and we're building stagewise (https://stagewise.io), a frontend coding agent that lives inside your browser on localhost and operates on local codebases. You can spawn the agent into locally running web apps in dev mode with `npx stagewise` from the project root. The agent lets you then click on HTML Elements in your app, enter prompts like 'increase the height here' and will implement the changes in your source code. Before stagewise, we were building a vertical SaaS for logistics from scratch and loved using prototyping tools like v0 or lovable to…
Stagewise (YC S25) – Front end coding agent for existing codebases launched on August 5, 2025 with 46 votes, #486 of 8,530 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Stagewise is a frontend coding agent that runs locally in the browser and modifies existing codebases. Developers can click on HTML elements in their running web app and enter natural language prompts to make changes, which the agent implements directly in the source code. Designed for developers working in local development environments, it brings AI-assisted prototyping capabilities to existing projects without requiring external tools or cloud services.
written from the facts on this page · September 2026
From the sources
The Open Source Agentic IDE. Create and orchestrate coding agents, show app previews and run git workflows. Use your favorite models across all providers. - stagewise-io/stagewise
In the maker’s words, at launch
Hey HN, we're Julian and Glenn, and we're building stagewise (https://stagewise.io), a frontend coding agent that lives inside your browser on localhost and operates on local codebases. You can spawn the agent into locally running web apps in dev mode with `npx stagewise` from the project root. The agent…
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stagewise2025 · stagewise.io · ▲310Hey HN, we're Glenn and Julian, and we're building stagewise (https://stagewise.io), a frontend coding agent that inside your app’s dev mode and that makes changes in your local codebase. We’re compatible with any framework and any component library. Think of it like a v0 of Lovable that works locally and with any existing codebase. You can spawn the agent into locally running web apps in dev mode with `npx stagewise` from the project root. The agent lets you then click on HTML Elements in your app, enter prompts like 'increase the height here' and will implement the changes in…
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