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iotop-c vs atop: catalog facts
iotop-c	atop
Free Free and open source.	Free Free to download and use.
Linux, Command line	Linux, Command line
Shows disk I/O per process rather than per device Familiar top-style terminal display	Includes processes that finished during the interval Daily logging for long-term analysis
Linux only Usually needs root privileges to see all processes	Linux only Per-process network data needs an extra kernel module
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
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 23, 2026

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