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CurrPorts vs PortKiller: catalog facts
CurrPorts	PortKiller
Free Freeware from NirSoft; free to redistribute as long as nothing is charged.	Free The repository provides the software under the MIT License.
Windows	Windows, macOS, Linux
Shows the process, path and user behind every open port Can close TCP connections and kill the owning process	Finds listening TCP ports and identifies their processes Can terminate processes and monitor selected ports
Official requirements list Windows versions up to Windows 10 The 'Use DNS Cache For Host Names' option leaks memory during long auto-refresh sessions	Limitations not stated
Downloadable app	Downloadable app
Closed source	Open source
License: Freeware	License: MIT
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 4, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.