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DiskSpd vs AJA System Test: catalog facts
DiskSpd	AJA System Test
Free Free and open source from Microsoft.	Free Offered as a free download from AJA's product page.
Windows, Command line	Windows, macOS
Built and used by Microsoft's storage engineering teams Highly configurable synthetic workloads	Results are given in video terms such as resolution and codec Shows whether a drive can sustain recording and playback
Command line only, with many options to learn Windows only	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 24, 2026	Official website Full listing and sources Checked October 1, 2026

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