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htop vs nmon: catalog facts
htop	nmon
Free Free and open source under the GPL.	Free Free to download.
macOS, Linux, Command line	Linux, Command line
Kill, renice and filter processes interactively without typing PIDs Per-core meters and tree view make load easy to read at a glance	Many metrics on one screen with low CPU impact Records to CSV for later analysis
Terminal only, with no historical graphing Some counters differ per platform outside Linux	Terminal only, with keyboard toggles to learn Mainly aimed at Linux and AIX servers
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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