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OCCT vs Karhu RAM Test: catalog facts
OCCT	Karhu RAM Test
Freemium Free for individuals, with offerings for professional and business use.	Paid Sold as a paid license by Karhu Software.
Windows, Linux	Windows
Stress testing, benchmarking and monitoring in one tool Free for individual users	Runs inside Windows without rebooting Built for validating memory overclocks
Closed source Professional use is a separate offering	Windows only; Linux support was announced but not shown as available Paid license
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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.