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stress-ng vs Karhu RAM Test: catalog facts
stress-ng	Karhu RAM Test
Free Free and open source.	Paid Sold as a paid license by Karhu Software.
Linux, Command line	Windows
Stresses CPU, memory, I/O and kernel interfaces Stressors can be run individually or combined	Runs inside Windows without rebooting Built for validating memory overclocks
Command line only Can make a system unresponsive if used carelessly	Windows only; Linux support was announced but not shown as available Paid license
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	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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