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nmon vs Zenith: catalog facts
nmon	Zenith
Free Free to download.	Free Free and open source.
Linux, Command line	Linux, Command line
Many metrics on one screen with low CPU impact Records to CSV for later analysis	Zoomable usage charts inside the terminal Per-process disk usage in a filterable process table
Terminal only, with keyboard toggles to learn Mainly aimed at Linux and AIX servers	Unix-like systems only, no Windows support Terminal interface only, no graphical app
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
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 September 24, 2026

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