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DiskSpd vs KDiskMark: catalog facts
DiskSpd	KDiskMark
Free Free and open source from Microsoft.	Free Free and open source.
Windows, Command line	Linux
Built and used by Microsoft's storage engineering teams Highly configurable synthetic workloads	Simple interface over the fio benchmark engine Configurable block size, queues and threads
Command line only, with many options to learn Windows only	Linux only Relies on fio being installed
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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