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CrystalDiskMark vs AJA System Test: catalog facts
CrystalDiskMark	AJA System Test
Free Freeware. The developer asks for optional donations to support development.	Free Offered as a free download from AJA's product page.
Windows	Windows, macOS
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	Results are given in video terms such as resolution and codec Shows whether a drive can sustain recording and playback
Windows only Synthetic benchmarks do not always reflect how a drive feels in use	Narrow focus on storage speed for video work Product page gives few technical details
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 October 1, 2026

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