5 Best Port Managers for Windows
Every developer has hit “Port 3000 is already in use.” Here are the 5 best ways to find and kill whatever is squatting on your ports, from visual GUIs to the trusty command line.
Disclosure: Port Pilot is our tool. TCPView, CurrPorts, Resource Monitor, and netstat are listed because they are the real alternatives developers actually use. Honest pros and cons for each.
Quick Comparison
Port Pilot
Top PickA free, open-source visual port manager built specifically for developers. Dark-themed Electron app that shows every listening TCP port on your machine, the process that owns it, and lets you kill it with one click. Auto-detects 25+ dev stacks (React, Next.js, Django, PostgreSQL, Docker, and more), supports pinnable ports, search and filter, and runs in the system tray with configurable auto-refresh.
Pros
- +Completely free and open source (BSL 1.1, converts to Apache 2.0)
- +Portable .exe — no installer, no account, no telemetry
- +One-click kill button — no terminal commands needed
- +Auto-detects 25+ dev stacks so you know what framework is on each port
- +Dark-themed, modern UI designed for developers
Cons
- −Windows only (Mac and Linux support may come later)
- −Electron-based, so it uses more memory than a native utility (~80MB)
Verdict: The best port manager for developers. If you have ever googled 'how to kill process on port 3000 Windows,' this replaces that entire workflow with a single click. Free, visual, modern.
TCPView
A classic Microsoft Sysinternals tool by Mark Russinovich. TCPView shows all TCP and UDP endpoints on your system with the owning process, state, and remote address. It has been a staple of Windows administration for over 20 years. You can close connections and kill processes from the UI, but the interface is distinctly Win32-era.
Pros
- +Free, from Microsoft (Sysinternals suite)
- +Shows TCP and UDP connections with full state information
- +Lightweight and fast — pure Win32 native application
- +Trusted by sysadmins for decades
Cons
- −Dated UI — looks and feels like a Windows XP application
- −No stack detection — shows process names but does not identify frameworks
Verdict: Solid and reliable. If you are already in the Sysinternals ecosystem and want a no-frills TCP connection viewer, TCPView works. But it was designed for sysadmins diagnosing network issues, not developers killing port conflicts. The UI shows its age.
CurrPorts
A lightweight port monitoring utility from NirSoft. CurrPorts lists all currently opened TCP/IP and UDP ports and the process that opened each port. You can close connections, kill processes, and export the list to various formats. Like most NirSoft tools, it is portable and does not require installation.
Pros
- +Free and portable — single .exe, no install required
- +Can export port data to HTML, CSV, XML, and text formats
- +Supports command-line parameters for scripting and automation
- +Lightweight — tiny footprint, runs on anything
Cons
- −UI is from 2005 — Windows classic ListView with no modern styling
- −No stack detection, no one-click presets, no dark theme
Verdict: A perfectly functional port viewer if you do not care about aesthetics. NirSoft tools are legendary for being small, portable, and reliable. CurrPorts does the job, but the UI makes you feel like you are filing your taxes in 2003.
Resource Monitor
Windows Resource Monitor (resmon.exe) is built into every copy of Windows and includes a Network tab that shows TCP connections, listening ports, and which processes are using network resources. It is already on your machine — you just need to find it.
Pros
- +Already installed on every Windows machine — zero downloads
- +Shows CPU, memory, disk, and network in one place
- +Network tab shows listening ports with process names and PIDs
Cons
- −Buried in the OS — most developers do not know it exists (Win+R, resmon.exe, Network tab)
- −Slow to load and refresh — not designed for quick port checks
Verdict: Useful in a pinch when you cannot install anything. If you are on a locked-down corporate machine and need to check ports right now, resmon.exe is your friend. But for daily developer use, it is too slow and buried to be practical.
netstat Command
The classic command-line tool for viewing network connections and listening ports. Every developer has typed 'netstat -ano | findstr :3000' at some point. It works, it is reliable, and it is the baseline that every GUI tool on this list is essentially wrapping.
Pros
- +Built into every version of Windows — always available
- +Scriptable — can be piped, filtered, and automated
- +No dependencies, no downloads, works in any terminal
Cons
- −Requires memorizing flags (-a, -n, -o, -b) and piping to findstr
- −No visual interface — you get a wall of text that you have to parse yourself
Verdict: The foundation that all port managers build on. Every developer should understand netstat, but nobody should have to use it daily. Port Pilot runs netstat under the hood — it just shows you the results in a visual table with a kill button instead of a wall of monospaced text.
Why We Built Port Pilot
I was running 4 dev servers, a Postgres container, Redis, and a Next.js frontend. Something was on port 3000 and I had no idea what. I opened PowerShell, typed netstat -ano | findstr :3000, got a PID, cross-referenced it in Task Manager, killed it, and hoped it was the right thing.
I did this multiple times a day. Every developer does. TCPView exists but looks like it was designed for Windows XP sysadmins. CurrPorts works but the UI is from 2005. Resource Monitor is buried three clicks deep and takes 10 seconds to load.
Port Pilot shows you a clean, dark-themed table of every listening port. It tells you what framework is running on each one. And it has a kill button. That is it. That is the whole tool. Built in a single session with Claude Code.
The Verdict
For daily developer use, Port Pilot is the best option. It was designed for exactly the workflow you have: something is on a port, you want to see what it is, and you want to kill it. One window, one click, done.
If you are a Windows sysadmin debugging network issues and need to see all TCP/UDP connections (not just listening ports), TCPView is the Sysinternals standard. It shows more connection detail than Port Pilot and has been trusted for 20+ years.
If you need to export port data for scripting or documentation, CurrPorts has the best export options (HTML, CSV, XML).
If you cannot install anything, Resource Monitor is already on your machine. Press Win+R, type resmon, click the Network tab. It works in a pinch.
And every developer should understand netstat, even if you never type it again after installing Port Pilot. Know the fundamentals, use the tool that wraps them.
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Read moreDisclosure: Port Pilot is built by Nimba Solutions (Cloud Nimbus LLC), the same company behind this website. We rank it first because we genuinely believe it is the best option for developers who need a visual port manager. No affiliate links on this page. All opinions are our own. Features were accurate as of March 2026 and may have changed.