PopUI - Collaborative UX for Claude Desktop

Overview

PopUI is a companion desktop app that gives Claude Desktop new tools.

Leveraging Claude's ability to create user interfaces, PopUI creates a bi-directional bridge to a visual context.

Claude creates and automatically displays a user interface (similar to artifacts)
Claude can read changes done in the UI and use the UI as a visual context
Claude can also push changes to the UI, visually updating it for the user
The UI can send events and text back to chat, obviating the need for keyboard input in the loop

Collaborative UX

How is this different from Artifacts?

PopUI closes the interaction loop. While Claude Artifacts can generate interactive UI elements, any events or changes that happen in them are trapped outside of the chat conversation. With PopUI, Claude has tools to interrogate and manipulate the external state, allowing Claude to build further conversation on top of that shared context.

Realtime visual context

PopUI also gives the Claude and the user the ability to receive and manipulate visual context.

Some examples:

Instantly build control panels for tweaking and refining values in the chat
Talk to Claude about colors with a color picker with swatches.
Talk to Claude about a physical layout
Play turn-based games with Claude on a shared gameboard
Give Claude a sense of time with a real-time wall clock
Give Claude a literal face to express its emotions during the chat

Proxying the SSE MCP server to Claude Desktop

Add a supergateway proxy to your claude_desktop_config.json file.

{
    "mcpServers": {
        "popui": {
            "command": "npx",
            "args": [
                "-y",
                "supergateway",
                "--sse",
                "http://localhost:3002/sse"
            ]
        }
    }
}