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ngrep vs netsniff-ng: catalog facts
ngrep	netsniff-ng
Free Free open-source software.	Free Free to download and use.
Windows, Linux, Command line	Linux, Command line
Grep-style matching on packet payloads Accepts tcpdump-style BPF filters	Capture, analysis and traffic generation in one toolkit Built for high packet rates on Linux
Text output only, with no protocol decoding like Wireshark Capturing traffic usually needs root or administrator rights	Linux only Command-line tools with no graphical interface
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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