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fio vs KDiskMark: catalog facts
fio	KDiskMark
Free Free and open source.	Free Free and open source.
Linux, Command line	Linux
Highly configurable workloads through job files Many I/O engines for different storage paths	Simple interface over the fio benchmark engine Configurable block size, queues and threads
Steep learning curve for new users Command-line only, no built-in graphical interface	Linux only Relies on fio being installed
Downloadable app	Downloadable app
Open source	Open 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.