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btop++ vs nmon: catalog facts
btop++	nmon
Free Free and open source, funded by donations.	Free Free to download.
macOS, Linux, Command line	Linux, Command line
Sortable, filterable process list with per-process detail, driven by mouse or keyboard Graphs for CPU, memory, disks and network in one screen	Many metrics on one screen with low CPU impact Records to CSV for later analysis
No native Windows build; on Windows you need WSL It reports and does not manage: there is no alerting or historical logging	Terminal only, with keyboard toggles to learn Mainly aimed at Linux and AIX servers
Downloadable app	Downloadable app
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

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