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Web

Using Matrix in your browser.

Matrix can run as a web application in your browser, providing the same powerful AI coding experience without needing a terminal.

Matrix Web - New Session

Getting Started

Start the web interface by running:

Terminal window
matrix web

This starts a local server on 127.0.0.1 with a random available port and automatically opens Matrix in your default browser.

Configuration

You can configure the web server using command line flags or in your config file.

Port

By default, Matrix picks an available port. You can specify a port:

Terminal window
matrix web --port 4096

Hostname

By default, the server binds to 127.0.0.1 (localhost only). To make Matrix accessible on your network:

Terminal window
matrix web --hostname 0.0.0.0

When using 0.0.0.0, Matrix will display both local and network addresses:

  Local access:       http://localhost:4096
  Network access:     http://192.168.1.100:4096

mDNS Discovery

Enable mDNS to make your server discoverable on the local network:

Terminal window
matrix web --mdns

This automatically sets the hostname to 0.0.0.0 and advertises the server as matrix.local.

You can customize the mDNS domain name to run multiple instances on the same network:

Terminal window
matrix web --mdns --mdns-domain myproject.local

CORS

To allow additional domains for CORS (useful for custom frontends):

Terminal window
matrix web --cors https://example.com

Authentication

To protect access, set a password using the MATRIX_SERVER_PASSWORD environment variable:

Terminal window
MATRIX_SERVER_PASSWORD=secret matrix web

The username defaults to matrix but can be changed with MATRIX_SERVER_USERNAME.

Using the Web Interface

Once started, the web interface provides access to your Matrix sessions.

Sessions

View and manage your sessions from the homepage. You can see active sessions and start new ones.

Matrix Web - Active Session

Server Status

Click “See Servers” to view connected servers and their status.

Matrix Web - See Servers

Attaching a Terminal

You can attach a terminal TUI to a running web server:

Terminal window
# Start the web server
matrix web --port 4096


# In another terminal, attach the TUI
matrix attach http://localhost:4096

This allows you to use both the web interface and terminal simultaneously, sharing the same sessions and state.

Config File

You can also configure server settings in your matrix.json config file:

{
  "server": {
    "port": 4096,
    "hostname": "0.0.0.0",
    "mdns": true,
    "cors": ["https://example.com"]
  }
}

Command line flags take precedence over config file settings.