PortKiller
A cross-platform port management tool for developers.
Download PortKiller
macOS package (.dmg), architecture unlisted — verify before installing
Getting a "can't verify the developer" warning?
If you see a warning on first launch, go to System Settings > Privacy & Security and click "Open Anyway". Open source software usually isn't signed with an Apple developer certificate, which is normal.
Clicking "Download" takes you to a source confirmation page first; the download starts after confirmation.
About PortKiller
A powerful cross-platform port management tool for developers. Monitor ports, manage Kubernetes port forwards, integrate Cloudflare Tunnels, and kill processes with one click.
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Risk notice
PortKiller can forcefully terminate processes. Incorrect actions may interrupt running services; double-check the process before killing it. On macOS, the first launch may show a “developer cannot be verified” warning. Ensure you download from the official Releases and verify the file before opening.
Who it's for
- Developers who frequently encounter local port conflicts and need to quickly identify and kill processes
- Kubernetes developers who regularly manage kubectl port-forward sessions
- Developers or operators who use and monitor Cloudflare Tunnels
- Users who prefer quick access via menu bar or system tray
- Engineers who want to keep an eye on local listening ports during development
Who it's not for
- Casual users who don't need to manage local ports or processes
- Users who require packet-level traffic analysis (e.g., Wireshark)
- Developers who prefer pure command-line tools and have no need for a GUI
Install guide
macOS
Requires macOS 15.0 or later.
- Download
PortKiller-v3.3.3-macos.dmg. - Double-click the DMG and drag
PortKiller.appinto the Applications folder. - On first launch, if macOS shows “cannot be opened because the developer cannot be verified,” go to System Settings > Privacy & Security and click “Open Anyway.”
Windows
Requires Windows 10 or later.
- For x64, download
PortKiller-v3.3.3-windows-x64.zip. - For ARM64, download
PortKiller-v3.3.3-windows-arm64.zip.
Extract the ZIP and run the executable inside. If Windows SmartScreen appears, click “More info” and then “Run anyway” if you trust the source.
FAQ
Is PortKiller free?
Yes, PortKiller is open source under the MIT license and free to use.
What operating systems are supported?
macOS 15.0+ and Windows 10+. The macOS version runs in the menu bar; the Windows version runs in the system tray.
How do I update PortKiller?
You can download the latest release from GitHub Releases, or on macOS update via Homebrew: `brew upgrade --cask productdevbook/tap/portkiller`.
What do I need for Kubernetes port forwarding?
You need `kubectl` installed and configured locally, with access to your target cluster.
Can I see the status of Cloudflare Tunnels?
Yes, PortKiller can view and manage active Cloudflare Tunnel connections.