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stress-ng vs OCCT: catalog facts
stress-ng	OCCT
Free Free and open source.	Freemium Free for individuals, with offerings for professional and business use.
Linux, Command line	Windows, Linux
Stresses CPU, memory, I/O and kernel interfaces Stressors can be run individually or combined	Stress testing, benchmarking and monitoring in one tool Free for individual users
Command line only Can make a system unresponsive if used carelessly	Closed source Professional use is a separate offering
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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