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Karhu RAM Test vs Prime95: catalog facts
Karhu RAM Test	Prime95
Paid Sold as a paid license by Karhu Software.	Free Free to download and use under the GIMPS free software license.
Windows	Windows, macOS, Linux
Runs inside Windows without rebooting Built for validating memory overclocks	Standard, demanding CPU and memory stress test Builds for Windows, macOS, Linux and FreeBSD
Windows only; Linux support was announced but not shown as available Paid license	Not an OSI open source license Dated interface
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License: GIMPS free software license
Not stated if an account is 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 1, 2026

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