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htop vs Plasma System Monitor: catalog facts
htop	Plasma System Monitor
Free Free and open source under the GPL.	Free Free and open source, developed by the KDE community.
macOS, Linux, Command line	Linux
Kill, renice and filter processes interactively without typing PIDs Per-core meters and tree view make load easy to read at a glance	Shows sensors, processes and resource usage in one window Customizable monitoring pages
Terminal only, with no historical graphing Some counters differ per platform outside Linux	Linux only Most at home on a KDE Plasma desktop
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0-only OR GPL-3.0-only
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.