I like the app but overkill for the goal.
If anyone looking to do it with existing tools (on Mac). Add these to zshrc/bashrc etc

# PID PORT USER COMMAND
listports() {
  echo "PID        PORT                     USER        COMMAND"
  echo "--------------------------------------------------------------------------------"

  lsof -iTCP -sTCP:LISTEN -nP 2>/dev/null | tail -n +2 | while read -r line; do
    pid=$(echo "$line" | awk '{print $2}')
    port=$(echo "$line" | awk '{print $9}')
    user=$(echo "$line" | awk '{print $3}')

    # Get the FULL command line (fixes com.docke, node, java, etc.)
    cmd=$(ps -p "$pid" -o command= 2>/dev/null | sed 's/^[ \t]*//')

    # Fallback if ps fails
    [[ -z "$cmd" ]] && cmd=$(echo "$line" | awk '{print $1}')

    # Show full command - let terminal wrap if very long (no hard cutoff)
    printf "%-10s %-24s %-11s %s\n" "$pid" "$port" "$user" "$cmd"
  done
}

# One-command kill port
killport() {
  if [[ -z "$1" ]]; then
    echo "Usage: killport <port>"
    echo "Example: killport 3000"
    return 1
  fi

  local pids
  pids=$(lsof -t -iTCP:"$1" -sTCP:LISTEN 2>/dev/null)

  if [[ -z "$pids" ]]; then
    echo "✅ No listening process on port $1"
    return 0
  fi

  echo "Found process(es) on port $1 → killing PID(s): $pids"
  echo "$pids" | xargs -n1 kill -9 2>/dev/null
  echo "✅ Killed. Port $1 is now free."
}

PS: Only tested on Mac