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System Monitoring Center vs Plasma System Monitor: catalog facts
System Monitoring Center	Plasma System Monitor
Free Free and open source under the GPL-3.0 licence.	Free Free and open source, developed by the KDE community.
Linux	Linux
Detailed performance and usage views in one window Translated into many languages	Shows sensors, processes and resource usage in one window Customizable monitoring pages
Linux only Several parallel versions can be confusing to choose between	Linux only Most at home on a KDE Plasma desktop
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0-only OR GPL-3.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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