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y-cruncher vs Karhu RAM Test: catalog facts
y-cruncher	Karhu RAM Test
Free Freeware, free to download and use.	Paid Sold as a paid license by Karhu Software.
Windows, Linux, Command line	Windows
Scales across many CPU cores Established benchmark with published fastest times	Runs inside Windows without rebooting Built for validating memory overclocks
Closed source freeware Large computations need a lot of memory and disk space	Windows only; Linux support was announced but not shown as available Paid license
Downloadable app	Downloadable app
Closed source	Closed source
License: Freeware	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.