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CrystalDiskMark vs ATTO Disk Benchmark: catalog facts
CrystalDiskMark	ATTO Disk Benchmark
Free Freeware. The developer asks for optional donations to support development.	Free Free download from ATTO.
Windows	Windows
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	Free download from a storage hardware maker Measures both read and write performance
Windows only Synthetic benchmarks do not always reflect how a drive feels in use	Little product detail on the vendor's pages Proprietary software
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is 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.