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nmon vs bottom: catalog facts
nmon	bottom
Free Free to download.	Free Free and open source under the MIT licence.
Linux, Command line	Windows, macOS, Linux, Command line
Many metrics on one screen with low CPU impact Records to CSV for later analysis	Plots CPU, memory, network, temperature and disk I/O over time, with a zoomable interval Process widget with sorting, searching, tree mode and kill signals
Terminal only, with keyboard toggles to learn Mainly aimed at Linux and AIX servers	Some sensors and metrics are only available on some platforms Charts take terminal space; a small window gets cramped
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 21, 2026

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