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DiskSpd vs CrystalDiskMark: catalog facts
DiskSpd	CrystalDiskMark
Free Free and open source from Microsoft.	Free Freeware. The developer asks for optional donations to support development.
Windows, Command line	Windows
Built and used by Microsoft's storage engineering teams Highly configurable synthetic workloads	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
Command line only, with many options to learn Windows only	Windows only Synthetic benchmarks do not always reflect how a drive feels in use
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
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 21, 2026

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