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

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