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CrystalDiskMark vs DiskSpd: catalog facts
CrystalDiskMark	DiskSpd
Free Freeware. The developer asks for optional donations to support development.	Free Free and open source from Microsoft.
Windows	Windows, Command line
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	Built and used by Microsoft's storage engineering teams Highly configurable synthetic workloads
Windows only Synthetic benchmarks do not always reflect how a drive feels in use	Command line only, with many options to learn Windows only
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 21, 2026	Official website Full listing and sources Checked September 24, 2026

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