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KDiskMark vs CrystalDiskMark: catalog facts
KDiskMark	CrystalDiskMark
Free Free and open source.	Free Freeware. The developer asks for optional donations to support development.
Linux	Windows
Simple interface over the fio benchmark engine Configurable block size, queues and threads	Sequential and random read, write and mixed measurements in a few clicks Peak, real-world and demo modes covering different queue depths and thread counts
Linux only Relies on fio being installed	Windows only Synthetic benchmarks do not always reflect how a drive feels in use
Downloadable app	Downloadable app
Open 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 21, 2026

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