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atop vs nmon: catalog facts
atop	nmon
Free Free to download and use.	Free Free to download.
Linux, Command line	Linux, Command line
Includes processes that finished during the interval Daily logging for long-term analysis	Many metrics on one screen with low CPU impact Records to CSV for later analysis
Linux only Per-process network data needs an extra kernel module	Terminal only, with keyboard toggles to learn Mainly aimed at Linux and AIX servers
Downloadable app	Downloadable app
Closed source	Closed 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 September 23, 2026

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