h41

A lightweight tool that discovers all listening TCP ports on your machine with a TUI and optional web interface.

Features

• 🔍 Discover all listening TCP ports via lsof
• 🖥️ TUI (default) — interactive terminal interface with vim-like navigation
• 🌐 Web UI — optional browser-based interface (--web)
• 🔎 Live filtering by path, process name, port, or command args
• 🏠 Smart filtering hides system processes by default (toggle to show all)
• 💀 Kill processes with confirmation
• 🔗 Open in browser — launch a port's URL directly
• 📦 JSON output mode for scripting (--json)
• 🔒 Secure by default — web server binds to localhost only

Installation

Homebrew (macOS/Linux)

brew tap 9h41/h41 https://github.com/9h41/h41
brew install h41

Scoop (Windows)

scoop bucket add h41 https://github.com/9h41/h41
scoop install h41

Download from GitHub Releases

Pre-built binaries for macOS, Linux, and Windows are available on the Releases page.

From source

cargo install --path .

Usage

# Start the TUI (default)
h41

# Start the web UI on port 8941
h41 --web

# Use a custom port for the web UI
h41 --web --port 8080

# Output JSON to stdout
h41 --json

TUI Keybindings

Key	Action
j / ↓	Move down
k / ↑	Move up
o / Enter	Open in browser
x	Kill process (with confirmation)
/	Filter (type to search, Esc to close)
a	Toggle show all / user-only
r	Refresh
q / Esc	Quit

Requirements

• macOS or Linux with lsof available
• Windows with netstat available (built-in)

License

MIT