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The features in this guide are only available in the Subframe desktop app. Download the desktop app for macOS or Windows ↗.
Open your app in a browser tab to start editing it live or capturing it as a design.
1

Connect your codebase

Open a new browser tab, click Connect codebase, then select your local repository.You can also connect your codebase from Agent chat.
2

Start your dev server

Click Start server. Your agent starts the dev server and opens your app.
If your server is already running, click its port under Detected servers.
A new tab with localhost:3000 listed under Detected servers, along with its page title, repository, and branch

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Opening any URL

Enter a URL such as localhost:3000 in the address bar, then press Enter.
Last modified on October 22, 2026