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atop vs Zenith: catalog facts
atop	Zenith
Free Free to download and use.	Free Free and open source.
Linux, Command line	Linux, Command line
Includes processes that finished during the interval Daily logging for long-term analysis	Zoomable usage charts inside the terminal Per-process disk usage in a filterable process table
Linux only Per-process network data needs an extra kernel module	Unix-like systems only, no Windows support Terminal interface only, no graphical app
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 24, 2026

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