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Karhu RAM Test vs stress-ng: catalog facts
Karhu RAM Test	stress-ng
Paid Sold as a paid license by Karhu Software.	Free Free and open source.
Windows	Linux, Command line
Runs inside Windows without rebooting Built for validating memory overclocks	Stresses CPU, memory, I/O and kernel interfaces Stressors can be run individually or combined
Windows only; Linux support was announced but not shown as available Paid license	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
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.