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CrystalDiskMark vs fio: catalog facts
CrystalDiskMark	fio
Free Freeware. The developer asks for optional donations to support development.	Free Free and open source.
Windows	Linux, 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	Highly configurable workloads through job files Many I/O engines for different storage paths
Windows only Synthetic benchmarks do not always reflect how a drive feels in use	Steep learning curve for new users Command-line only, no built-in graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-2.0
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 23, 2026

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