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

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