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ATTO Disk Benchmark vs CrystalDiskMark: catalog facts
ATTO Disk Benchmark	CrystalDiskMark
Free Free download from ATTO.	Free Freeware. The developer asks for optional donations to support development.
Windows	Windows
Free download from a storage hardware maker Measures both read and write performance	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
Little product detail on the vendor's pages Proprietary software	Windows only Synthetic benchmarks do not always reflect how a drive feels in use
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is 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.