stagewise

stagewise is a frontend coding agent that lives inside your running web app on localhost. Instead of switching between a browser and an IDE, developers click on a UI element, describe the change in plain language, and stagewise edits the actual source code in the local codebase. Started by Julian Goetze and Glenn Toews and part of Y Combinator's Summer 2025 batch, it began as an open-source, framework-agnostic toolbar that has been downloaded more than 130,000 times and starred over 4,800 times on GitHub.