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OCCT vs Memtest86+: catalog facts
OCCT	Memtest86+
Freemium Free for individuals, with offerings for professional and business use.	Free Free and open source under the GPL v2.
Windows, Linux	Windows, Linux
Stress testing, benchmarking and monitoring in one tool Free for individual users	Runs without an operating system, from BIOS or UEFI Supports 32-bit and 64-bit x86 plus LoongArch64
Closed source Professional use is a separate offering	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
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 1, 2026

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