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Karhu RAM Test vs Memtest86+: catalog facts
Karhu RAM Test	Memtest86+
Paid Sold as a paid license by Karhu Software.	Free Free and open source under the GPL v2.
Windows	Windows, Linux
Runs inside Windows without rebooting Built for validating memory overclocks	Runs without an operating system, from BIOS or UEFI Supports 32-bit and 64-bit x86 plus LoongArch64
Windows only; Linux support was announced but not shown as available Paid license	Requires rebooting the machine to run a test No ARM support
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 1, 2026

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