See what's on your ports.

A tiny Mac menu-bar app that shows which localhost ports are in use — and kills that stuck dev server with one click.

Free · Universal · macOS 13 or later

PortPeek System ☐

3000

nodePID 4821

5173

nodePID 5199

OpenKill

8080

python3PID 6042

5432

postgresPID 612

Why

You close the terminal, but the dev server keeps running. Next time you start it: EADDRINUSE: address already in use :::3000.

The fix today is lsof -i :3000, read the PID, kill -9. Every time. PortPeek turns that into a glance and a click.

Every listening TCP port with its process name and PID, refreshed every five seconds.

Hover any row and hit Kill. No PID hunting, no terminal.

Jump straight to localhost:5173 without typing it.

Native SwiftUI, no dock icon, 200 KB. System ports hidden by default.

PortPeek isn't code-signed yet, so macOS Gatekeeper will block the first launch. Until it's notarized, here's the way around it:

Unzip and drag PortPeek.app to your Applications folder.
Right-click the app and choose Open (double-clicking won't offer the bypass).
Click Open in the warning dialog. You only do this once.

If macOS still refuses, clear the quarantine flag:

xattr -dr com.apple.quarantine /Applications/PortPeek.app

It was built to scratch an itch, not to sell subscriptions. If it saved you a few trips to the terminal, a small tip is a lovely way to say thanks.